TM 9-1220-223-14DEPARTMENT OF THE ARMY TECHNICAL MANUAL

OPERATOR, ORGANIZATIONAL, DIRECT

SUPPORT AND GENERAL SUPPORT MAINTENANCE

MANUAL INCLUDING REPAIR PARTS AND

SPECIAL TOOLS LISTS FOR INDIRECT

FIRE PLOTTING BOARD M17 W/E

[1220-588-7282]

This copy is a reprint which includes current

pages from Change 1.

HEADQUARTERS, DEPARTMENT OF THE ARMY

JUNE 1971

TM 9-1220-223-14C1

CHANGE HEADQUARTERSDEPARTMENT OF THE ARMY

No. 1 WASHINGTON, D.C. 5 Februay 1973

Operator, Organizational, Direct Support and General Support MaintenanceManual Including Repair Parts and Special Tools Lists

INDIRECT FIRE PLOTTING BOARD M17 W/E (1220488-7282)FOR

TM 9-1220-223-14, 11 June 1971 is changed as follows:Page C-6 Section II. Basic Issue Items List is superseded as follows:

Section II. BASIC ISSUE ITEMS LIST

By Order of the Secretary of the Army:

Official:VERNE L. BOWERSMajor General, United States ARmYThe Adjutant General

CREIGHTON W. ABRAMSGeneral, United States ArmyChief of Staff

Distribution :TO be distributed in accordance with DA Form 12-41, (qty rqr block no. 10) Operator maintenance requirements for

Board Plotting,

*TM 9-1220-223-14

TECHNICAL M A N U A L

No. 9–1220–223-14

HEADQUARTERS,DEPARTMENT OF THE ARMYWASHINGTON , D. C., 11 June 1971

CHAPTER 1.

Section I.II.

CHAPTER 2.

Section I.II.

III.

CHAPTER 3.

Section I.II.

III.IV.

CHAPTER 4.

5.

Section I.II.

APPENDIX A.

B.

C.

INDEX

INTRODUCTIONParagraph

General -------------------------------------------------------------------------------------------------- 1-1Description and data --------------------------------------------------------------------------------- 1 -4

OPERATING INSTRUCTIONS

Service upon receipt of materiel --------------------------------------------------------- 2-1Operation under usuual condition ------------------------------------------------------------------ 2-4Operation under unusual conditions ---------------------------------------------------------

2-11MAINTENANCE INSTRUCTIONS

Repair parts, tools, and equipment --------------------------------------------------------- 3-1Preventive maintenance services ------------------------------------------------------------- 3-6Troubleshooting ---------------------------------------------------------------------------------------- 3-8Repair of plotting board M17 and carrying case M72 ------------------------------

3-10FINAL INSPECTION ------------------------------------------------------------------------ 4-1

PROCESSING AND PACKAGING, SHIPMENT, AND DESTRUCTION TOPREVENT ENEMY USE

Processing, packaging and shipment ------------------------------------------------------ 5-1Destruction of matiriel to prevent enemy use --------------------------------- 5-3

REFERENCES ----------------------------------------------------------------------------------------------------------------------- ------

MAINTENANCE ALLOCATION CHART --------------------------------------------------------

BASIC ISSUE ITEMS LIST, ORGANIZATIONAL, DIRECT SUPPORT, GENERALSUPPORT AND DEPOT MAINTENANCE REPAIR PARTS AND SPECIALTOOLS LISTS -----------------------------------------------------------------------------------------------

OPERATOR, ORGANIZATIONAL, DIRECT

SUPPORT AND GENERAL SUPPORT

MAINTENANCE MANUAL INCLUDING

REPAIR PARTS AND SPECIAL TOOLS LISTS

INDIRECT FIRE PLOTTING BOARD M17 W/E

(1220-88-7282)

Page

1-11-1

2-12-12-6

3-13-13-43-6

4-1

5-15-1

A-1

B-1

C-1

I-1-------------------------------------------------------------------------------------

This manual supersedes TM 9-1220-223-15, dated 31 May 1961 including all changes.

CHAPTER 1

INTRODUCTION

Section I.

1-1. Scope

a. This manual contains instructions for opera-tor, organizational, direct support, general sup-port, and depot maintenance for indirect fire plot-ting board M17 W/E (1220-588-7282).

b. Appendix A is a list of current references,including supply and technical manuals, formsand other publications applicable to plottingboard M17.

c. Appendix B contains a maintenance alloca-tion chart which lists maintenance responsibili-ties allocated to each category of maintenance.

d. Appendix C contains basic issue items, or-ganizational, direct support, general support, anddepot maintenance repair parts and special toolslist.

GENERAL

1-2. Forms, Records and Reports

a. Authorized Forms. Refer to TM 38-750. Forlisting of all forms refer to

b. Report of Accidents. Theare prescribed in AR 385-40.

1-3. Reporting of Errors

Report of errors, omissions,

DA Pam 310-2.

necessary reports

and recommenda-tions for improving this publication by the indi-vidual user is encouraged. Reports should be sub-mited on DA Form 2028 (Recommended Changesto DA Publications) and forwarded direct tothe Commanding Officer, Frankford Arsenal,ATTN: AMSWE–MAF–W3100, Philadelphia,Pa. 19137.

Section Il. DESCRIPTION AND DATA

1-4. Description

a. General. Plotting board M17 (fig. 1–1) isa portable fire control instrument designed tohelp the operator in computing firing data forrange and azimuth of a target for indirect firingof the weapon. The plotting board utilizes knownrange and azimuth data from the weapon to anobservation post, in combination with reporteddata received from the post concerning locationof the target with respect to the post. It is usedto compute geometrically the range and azimuthof the target from the weapon.

b. Basic Components. Plotting board M17 (fig.1–2) is a two-part assembly and consists funda-mentally of a base (2) and an azimuth disk (1).

(1) Base. The base (6) (fig. 1-3) is com-posed of white laminated plastic to which apivot (1) is secured to accommodate the azimuthdisk. The azimuth disk is centrally mounted, andmay be rotated on the pivot. The base is squareon the right edge. The left edge, beginning at the

index line (8) is semicircular. The top and bottomedges are straight and parallel to each other,from the right edge to the index line. The surfaceof the base is roughened slightly to receive pencilmarkings during firing problem computation. Inaddition to the plotting board name and modelnumber, the base contains those markings on itssurface described in (a) through (f) below. Print-ing on the base surface is black, unless otherwisestated.

(a) The right edge of the base has a scale8 inches long graduated in inches from O to 7in one direction, with each graduation subdi-vided into tenths of an inch. The remaining 1inch, from O to 1 in the opposite direction, isdivided into twentieths of an inch.

(b) The top edge of the base has a scale9 centimeters long graduated in centimeters from1 to 9 and reading from right to left. Each gradu-ation is divided into millimeters. The figures 1through 9 and the letters MM are red.

(c) The vernier scale (3) on the top edge

1-1

Figure 1-1. Indirect fire plotting board M17 W/E.

of the base is graduated into 20 equal spaces.The central graduation line of the scale is di-rectly above the centrally located index mark(4). Ten equal divisions of the scale are locatedto each side of the index mark. The vernier scalemarking is red.

(d) At the bottom of the base (6) is atriple map scale (5) graduated in meters withits legend and representative ratios of 1:50,000,1:25,000, and 1:5,000. These representative ra-tios refer respectively to the top, middle, andlower scales. These scales are used to transferdata to or from a map or firing chart which hasone of these scales. The triple map scale is 1decimeter long and is divided into 10 divisions of

Figure 1-2. Indirect fire plotting board M17.

1 centimeter each. The first division, to the rightof the index line is equally divided into 10 spacesof 1 millimeter each. The nine graduation linesin the first division and all figures in the middlescale are red.

(e) The grid pat tern (7) is inclosedwithin an 8.000-inch circle. A series of l-inchvertical and horizontal squares and parts ofsquares are located within the circle parallelto the index and O. P. (observation post) lines(2). Each complete l-inch square is divided into100 equal squares. Twenty-eight incomplete 1-inch squares, bordering on the circle, containvarying amounts of smaller squares and parts ofsquares. There are 78 equally spaced verticaland horizontal lines and 80 equal vertical andhorizontal squares along the index and O.P. lines.All marking is red.

(f) The index line, passing through thecenter of the grid pattern, has an arrow touch-ing the top inside diameter of the circle. The ar-row points to the O (zero) index mark. A thinline, from the point of the arrow, intersects theindex mark and extends to, and becomes the cen-terline of, the vernier scale. This thin line is thepoint on the plotting board base at which alldeflections are read. The index line is graduated

1-2

Figure 1-3. Plotting board M17—Base.

outward, above and below the pivot, from 0 to2000 meters, in fifty meter increments and isnumbered from 1 to 19. These numbers are spacedon every second horizontal fine line. Each smallsquare on the grid pattern is, therefore, 50 meterson a side. The numbers to the left of the indexline indicate double values for the grid squares.Each small square is, therefore, 100 meters on aside when the double value scale is used. How-ever, any value may be assigned to the smallgrid square which best suits the problem at hand.All marking is red.

(2) Azimuth disk. The azimuth disk (fig,1–4) is a transparent, semirigid, plastic diskwith graduations printed around the entire outeredge and a centerline which runs through thecentral pivot point (2). When the pivot point inthe disk is on the pivot in the base (fig. 1-3),and the base is stationary, the disk can berotated to all positions within 360 degrees. Whenthe disk is properly mounted on the base, themarkings on the disk will appear as shown infigure 1-4.

(a) The surface of the azimuth disk (3),facing the operator, is slightly roughened to take

Figure 1-.4. Plotting board M17-azimuth disk.

pencil marks which can be erased followingcompletion of a problem.

(b) A thin centerl ine (4) is printedacross the diameter of the disk and intersectsthe pivot point (2). Red plus and minus marksare printed near both ends of the centerline foruse in computing angles of site.

(c) An azimuth scale (1) graduated inmils is printed around the entire outer edge of thedisk in a clockwise direction to conform to thecompass and is used to plot azimuth angles. Thisscale is graduated in 10-mil increments from 0to 6400 and numbered at 100-mil intervals from0 to 63.

(d) A supplementary, middle mil scalehaving red figures is located on the plus side ofthe centerline, running counterclockwise from 0to 32 and continuing on the minus side of thecenterline to 5. This middle scale is numberedin hundreds of mils. It is used in computingangles of site.

(e) A supplementary, innermost mil scalealso on the plus side of the centerline, beginsat a point 180 degrees from the 0 (zero) on themiddle scale. This scale runs clockwise from 0 to32 and is numbered in hundreds of mils. It isalso used in computing angles of site.

c. Operation. The plotting board can be op-erated in two positions.

1-3

(1) To determine initial direction and range,the arrow at the end of the index line will bepointing away from the operator. The index linewill be vertical.

(2) To determine angles of sight, the arrowat the end of the index line will be pointingtoward the right. The index line will be hori-zontal.

1-5. Tabulated Data

a. Weight and Dimensions.

Weight -------------------------------- 0.75 poundsDiameter 8 inchesThickness ---------------------------------- 3/32 inch

b. Limits of Operation.

Azimuth -------------------------------- 0 to 6400 milsRange -------------------------------- No limit

1-6. Equipment Issued with Plotting BoardM 1 7

Canvas carrying case M72 (fig. 1–1) is theonly piece of equipment issued with plottingboard M17. The case consists of a two-piece as-sembly into which the plotting board fits, andhas a flap or cover which is an integral part ofthe back piece. This bends over the case and isfastened to the front with a snap fastener. Theback of the case has a loop for carrying on a belt.

-------------------------------------

1-4

CHAPTER 2

OPERATING INSTRUCTIONS

Section I. SERVICE UPON RECEIPT OF MATERIEL

2-1. General

a. When a new, used, or reconditioned plot-ting board M17 is first received by the usingorganization, it is the responsibility of the officerin charge to determine whether the materielhas been properly prepared for service by thesupplying organization and to be sure that it isin condition to perform its function.

b. Make a record of missing parts or equip-ment and malfunctions. Correct all deficiencieswhich can be corrected.

2–2. DutiesThe organizational mechanic performs the in-

spection to determine whether the materiel hasbeen properly prepared for service and is in condi-tion to perform its assigned mission. It is theduty of the operator to assist the organizationalmechanic in the performance of these services.

2-3. ServicesUpon receipt of materiel, the operations de-

scribed in a through g below shall be performedto place the plotting board into operating condi-tion.

a. Open the sealed container and remove thecontents consisting of plotting board M17 andfolded carrying case M72.

b. Remove tape from plotting board.

c. Open one snap fastener securing carryingcase M72 (fig. 1–1 ) in closed position and lift thecover flap.

d. Gently lift the azimuth disk (fig. 1–2) upand off the pivot (fig. 1-3) to remove the diskfrom the base (fig. 1-2).

e. If temperatures are above freezing (320 F.),use cloth slightly dampened with water and re-move all dust and dirt from the surface of thebase (fig. 1–3) and from all surfaces of the azi-muth disk (fig. 1-4). If temperatures are belowfreezing, use a clean dry cloth.

f. Wipe the pivot (fig. 1-3) and pivot point(fig. 14) surfaces clean and carefully assemblethe azimuth disk on the base.

g. Invert carrying case M72 and shake out alldust and dirt adhering to its internal surfaces.

h. Insert plotting board M17 into carryingcase M72, and secure the cover flap of the casein a closed position with the snap fastener. Placethe carrying case with installed plotting boardin stowed position.

Note . S t o w T M 9 - 1 2 2 0 – 2 2 3 - 1 4 i n s i d e c a r r y i n g c a s eM72 with plotting board M17 when not in use.

Section Il. OPERATION UNDER USUAL CONDITIONS

2-4. General

This section contains instructions for the prop-

er care of the materiel, preparation for opera-tion, and the operation of plotting board M17under moderate temperatures and atmosphericconditions. Every organization equipped withthis plotting board must thoroughly train itspersonnel in the procedures for its operation.

2-5. Care in Handling

Plotting board M17 will not stand rough hand-ling or abuse. inaccuracy or breakage will resultfrom mistreatment. Any instrument that is func-tioning inaccurately or that contains damagedparts must be brought to the attention of or-ganizational maintenance personnel for disposi-tion. Repairs other than those expressly author-ized will not be performed by the operator.

2-1

a. Keep the plotting board and carrying caseas clean and dry as possible. If the board and/orcase is wet, wipe dry, spread case open, andallow to air-dry thoroughly. Do not place or allowthe plotting board to dry in the direct rays ofhot sun, on heated radiators, or on other typesof heated equipment where damage to the plot-ting board base and/or azimuth disk may occur.

b. When not in use, keep the plotting boardwithin the carrying case so that it is protectedfrom dirt, dust, moisture, chipping, scratching,and destruction.

c. Do not place the plotting board on its edgeor store other equipment on the board. These ac-tions will bend, break, and/or chip and destroythe board.

2-6. Preparation for Usea. Setting Up.

(1) Remove carrying case M72 with in-stalled plotting board from stowed position.

(2) Open the snap fastener securing thecover flap of the carrying case in closed position,open the flap, and remove the plotting board fromthe case.

(3) Place the plotting board on a flat stablesurface and proceed to operate it.

b. Inspection.

(1) General. Whenever inaccuracies, malad-justments, or other conditions affecting service-ability are disclosed by the inspection prescribedin table 2-1, remedial action should be taken ifthe maintenance required is within the scope ofthe operating personnel. If the maintenance re-quired is beyond the scope of the operating per-sonnel, the condition should be referred to theorganizational maintenance personnel for dis-position in accordance with the maintenance al-location chart (app B).

(2) Procedure. Visually examine the plot-ting board and carrying case for completenessand general appearance. There shall be no rustand/or corrosion on any metal part. The plasticsurfaces of the plotting board shall not becracked, chipped, warped, excessively scratched,pitted, or opaqued so that viewing of the gridpattern, scales, and graduations is hindered. Inaddition, inspect the plotting board and carryingcase as outlined in table 2-1.

2-2

Table 2-1. Operator’s Inspection Chart for Plotting Board M17 and Caring Case M72

Point ofinspection

Alinement

Azimuthdisk

Base

Pivot

Snapfastener

Loop

Figure

1–2, 1-3, and 1-4

14

1–3

1–1

1-1

Accepted standard

PLOTTING BOARD M17When the azimuth disk is assembled on the base (fig. 1–2), it shall be rotatable to any

required position. The index line on the base (fig. 1-3) and the centerline on thedisk (fig. 1-4) shall be in coincidence when the disk and the index mark on thebase are alined.

The azimuth disk shall be clean, flat, and in good condition as explained in the preced-ing text and shall rotate freely on its central pivot point to any azimuth position.The pivot point shall be a snug fit on the pivot.

The base surface shall be clean, flat, and in good condition as explained in the pre-ceding text.

The pivot, secured in the base, shall not be loose or bent.

CARRYING CASE M72One snap fastener shall be secured in the carrying case. It shall not be destroyed or

loosened in the case fabric, and shall properly hold the cover flap in a secure andclosed position.

The loop of the carrying case is secured by stitching to the reverse or back side (notshown in the illustration indicated). It shall be securely fastened to the case. Thestitching shall not be loose or torn.

2-7. Operation

a. The theory of operation of the plottingboard is simple and the accuracy of the resultsdepends on the skill of the operator. The plottingboard is used to plot accurately the relative posi-tions of the weapons, base points, and targetsand to determine the directions and distancesbetween these points. The size of the dots placedon the plotting board affects the accuracy of thedata determined. The dots shall be made assmall as possible. To make it easier to locatethese small dots, a small circle may be placedaround each slot. In computing the data, becareful to use the dot and not the circle. Pencilsharder than 2H and gritty erasers should not beused on the transparent plotting surfaces.

b. An arbitrary point on the disk may be se-lected as the weapon position or the observa-tion post. Whenever possible, the center (pivotpoint) of the plotting board is used to representeither the weapon position or the observationpost.

c. To plot a point with a given azimuth anddistance from another point, proceed as indi-cated in (1) through (3) below.

(1) Select an arbitrary point on the diskas location of the first point and place a pencildot. (If the pivot point is selected as the arbitrarypoint, it is not possible to make a pencil dot).

(2) Rotate the azimuth disk on the base (fig.1–2) until the stated azimuth is indicated overthe index mark.

(3) To determine the distance on the plot-ting board from the first point to the second point,divide the stated distance by 50 or 100 (depend-ing on which scale on the grid pattern (fig. 1–3)is used). The result is the number of squares onthe grid pattern between the two points. Countoff the number of squares, or fractions of squares,thus determined from the first point toward thetop of the plotting board and plot the secondpoint. The second point may be plotted also bymeasuring off the stated distance from the firstpoint toward the top of the plotting board usingthe range scales on the disk.

d. When the distance and azimuths to the tar-get firing position have been determined fromthe observation post, the azimuth and range fromthe weapon position to the target position (WT= weapon to target) is determined as indi-cated in (1) through (4) below.

(1) Use the pivot point (figs. 1-3 and 14)as the observation post.

(2) The locations of the firing position andthe target, as obtained at the observation postin terms of azimuth and distance, are plottedindividually on the movable disk.

(a) Set the azimuth scale (fig. 14) gra-duation corresponding to the azimuth over theindex mark (fig. 1–3).

(b) Mark each location with a pencil dotover the index line at the point on the range scalecorresponding to the distance in meters. Each dotis plotted toward the top of the plotting board.

(3) To determine the azimuth between the

2-3

two plotted points, the operator must rememberthat all parallel lines have the same azimuth.Therefore, when a particular azimuth is rotatedover the index mark, every vertical line on thegrid pattern (fig. 1–3) is pointing along that sameazimuth. This means also that the azimuth ofany of the vertical lines of the grid pattern isread at the index mark. To find the azimuth ofthe target with respect to the firing position, ro-tate the azimuth disk (fig. 1–2) until the twopencil dots lie along one of the vertical lines onthe base grid, or, until they are the same distancefrom the same vertical line with the target dottoward the top of the plotting board. The WTazimuth in this example may be read on theazimuth scale at the index mark on the base.

(4) Determine the range between the firingposition and the target in meters by countingthe number of small grid pattern graduationsseparating them when in the above position andmultiplying this number by 50 or 100, dependingon which scale on the grid pattern is used. TheWT range can also be determined by measuringthe distance, using one of the range scales on thebase.

e. In many cases, the index mark does notfall exactly on one of the 10-mil graduation linesof the azimuth scale. When this occurs, the opera-tor computing the range must use the vernierscale to read the azimuth to an accuracy of onemil (fig. 2–1). As an example, the use of thevernier scale for setting azimuth 5454 is shown inthe figure 2–1.

Note. Figure 2-1 shows vernier setting method and doesnot reflect the appearance of the vernier on plotting boardM17.

2-8. Uses for Plotting Board M17

a. To determine initial direction and range(para 2-9a).

b. To determine WT mil values from the azi-muth scale on the azimuth disk (para 2-9b).

c. To solve problems involving mil relations(para 2-9c).

d. To solve survey notes (para 2-9d).

2-9. Sample Problems

a. Determination of the Ini t ial Azimuth andRange From the Weapon Firing Position to theTarget.

(1) Given. Observation post at the center(pivot point) of the disk.

OP to weapon: Azimuth 4150 milsDistance 550 meters

Figure 2–1. Use of vernier scale.

OP to target: Azimuth 5454 milsDistance 1500 meters

(2) Procedure. To determine the azimuthand range from the weapon to the target usingthe range scale along the index line (fig. 1–3),where the smallest grid graduation represents50 meters, proceed as indicated in (a) through(d) below.

(a) Rotate the disk until 4150 mils is readover the index mark on the base. Mark the diskwith a pencil dot over the index line at the 550-meter graduation. This dot represents the loca-tion of the weapon (W).

(b) Rotate the disk until 5454 mils isread over the index mark on the base. Mark thedisk with a pencil dot over the index line at the1500-meter graduation. This dot represents thelocation of the target (T).

2-4

(c) Rotate the disk until the two pencildots are over, or parallel to, the same verticalline, or are the same distance from the same ver-tical line, with the dot representing the locationof the target (T) toward the vernier scale.

(d) Read the WT azimuth, at the indexmark on the base, as 5830 mils. The total numberof meters between the pencil dots when this posi-tion (1400 meters above the horizontal OP linepassing through the pivot plus 50 meters below)is the weapon-target (WT), range 1450 meters.

b. Determination of WT Mil Values from theAzimuth Scale on the Azimuth Disk.

(1) Problem 1. Observation post at center(pivot point) of the disk.

Observer (0) to Target (T) ●

Azimuth 800 milsDistance 2500 meters

Observer (0) to Weapon (W):Azimuth 2500 milsDistance 1250 meters

WT = 348 mils.

(2) Problem 2. Observation post at center(pivot point) of the disk.

Observer (0) to Target (T):Azimuth 5900 milsDistance 3200 meters

Observer (0) to Weapon (W):Azimuth 3850 milsDistance 1050 meters

WT = 6159 mils.

(3) Problem 3. Observation post at center(pivot point) of the disk.

Observer (0) to Target (T):Azimuth 2510 milsDistance 1400 meters

Observer (0) to Weapon (W)Azimuth 1310 milsDistance 1810 meters

WT-2702 (as read on the azimuth scalehaving red numerals).

c. Resolution of Problems Involving Mil Rela-tions.

(1) Problem 1.(a) Given. Observer has plotting board

Ml7 and is adjusting the sheaf of the weaponson the base point. Observer (O) to Base Point:Distance 400 meters. Burst from one weapon:25 mils to left of its proper place in the sheaf(measured with binocular at OP).

1. Angles involved are less than 30 mils.For ease in reading and to increase accuracy,count each 10-mil graduation of the mil scaleas 1 mil (10/10 = 1). Therefore, count the small-est grid graduation for lateral measurements only

at 5 meters (50/10 = 5) when using the rangescale along the index line. When the range scaleto the left of the index line is used, the small-est grid graduation for range represents 100 me-ters; therefore, count each lateral grid gradua-tion as 10 meters (100/10 = 10).

2. Angles involved are more than 30mils. Read the graduations on the mil scale asprinted (10 mils each) and count each lateralgrid graduation as either 50 or 100 meters,depending on the range scale used. Other typesof mil relationship may be similarly obtained.

(b) Procedure. To determine the deflec-tion correction in meters, using the range scalealong the index line (where the smallest gridgraduation represents 50 meters), proceed as in-dicated in 1 and 2 below.

1. Starting with the O (zero) on the milscale at the index mark and with the pivot pointof the disk representing the observer’s location(OP), rotate the disk until 25 mils (250 mils,see (a) (1) and (2) above) is read over the indexmark.

2. From the index line at the 400-metergraduation, measure laterally (perpendicular tothe index line) to the black centerline on thedisk (counting each small grid graduation as 5meters (see (a) (1) and (2) above). Note thatthis distance measures two small grid gradua-tions, or 10 meters. Since the burst was to theleft of the OT line, the deflection correction isright 10 (meters).

(2) Problem 2.(a) Given. Computer in the FDC has plot-

ting board Ml? and is controlling the adjust-ment of the sheaf on the base point. RangeWeapon to Base Point: 1700 meters. Observed cor-rection for one weapon: Right 10 (meters) (1)(b) 2 above). Deflection setting on weapon: Right30, base stake.

(b) Procedure. To determine the deflec-tion correction to be placed on the sight, pro-ceed as indicated in 1 through 4 below.

1. Set the 0 (zero) on the mil scale atthe index mark. With the pivot point of the diskrepresenting the weapon position, locate the1700-meter graduation, (weapon-base pointrange) on the index line.

2. From the index line at the 1700-me-ter graduation, measure off laterally (perpendi-cular and to the left of the index line) two smallgrid graduations, or 10 meters, and mentallynote this point (grid intersection) on the base.

3. Rotate the disk until the black cen-terline intersects this point (grid intersection)and read the angle at the index mark on thebase, in this case 6 mils.

2-5

4. As the deflection setting on the sightis right 30, the deflection to be given to theweapon is right 35 (right 30 plus right 6 to thenearest 5-mil graduation).

d. Solving of Survey Notes.

(1) Given. The weapon personnel are placedin position by section, each section in a differentlocation. The first section is plotted at the pivotpoint of the plotting board. The second section islocated (surveyed) with reference to the first sec-tion by compass and pacing. A traverse of twolegs is made to the second section from the firstsection.

(a) First leg: Azimuth 3800Distance 400 meters

(b) Second leg: Azimuth 4400Distance 500 meters

(2) Procedure. To plot the location of thesecond section with reference to the first section,proceed as indicated in (a) through (c) below.

(a) Use the range scale along the indexline.

(b) Rotate the disk until azimuth 3800 isat the index mark. Count up 400 meters alongthe red index line and make a pencil dot.

(c) Rotate the disk until azimuth 4400 isat the index mark. From the pencil dot just

plotted, count up 500 meters and make a pencildot. This is the location of the second section.

Note. To determine the azimuth and distancefrom the first section to the second section, rotate thedisk until the plotted location of the second section is _toward the top of the plotting board and is on the samevertical line, or the same distance from the samevertical line, as the first section plot (in this case on thered index line). The azimuth is 4134 mils and the distanceis 861 meters.

2-10. Accuracy

a. With one extremity of the dial index line incoincidence with each of the diametrical center-lines of the base, the other extremity of the indexline shall not be more than 5 mils out of coinci-dence with the corresponding base centerline.

b. The plotting board accuracy for the weap-on-target (WT) line shall be within 5.0 milsas determined by placing pencil dots at the tar-get (T) and weapon (W) points as measuredfrom observer (O) (represented by the centerpivoting point of the dial) using the OT and OWvalues specified above. When a line is drawnthrough the WT dots, the WT line is then laidparallel to the base O centerline (index line, fig.1–3) and the WT mil value is determined fromthe mil scale (azimuth scale, fig. 1-4) on the dial.

Section III. OPERATION UNDER UNUSUAL CONDITIONS

2-11. General

In addition to the normal operating proceduresfor usual conditions described in section II, spe-cial instructions for operating under unusual con-ditions are contained herein. In addition to thenormal preventative-maintenance services, specialcare in cleaning and handling must be observedwhere extremes of temperature and atmosphericconditions are present. Proper cleaning and hand-ling not only insure proper operation and func-tioning, but also guard against breakage and/or deterioration of the materiel.

2-12. Operation in Extreme Cold

a. In temperatures below freezing, it is neces-sary that extra care be used when handling theplotting board. Extreme cold will make the plas-tic material of the board more brittle, hence itwill be more easily broken if dropped or struckagainst other objects

b. Use a dry cloth for cleaning. A water dam-pened cloth will either freeze to the plottingboard or it will leave a film of ice on the boardand make it inoperable.

2-6

c. Do not permit the accumulation of snow orice on the plotting board. When not in use, al-ways keep the plotting board inside carrying caseM72 to prevent such accumulation and/or dam-age or destruction.

d. Never apply heat from strongly concen-trated sources directly to an extremely coldplotting board. Sudden great temperature changesmay cause breakage of the component parts ofthe plotting board or it may result in nonadher-ence of the bonded components due to “breaking-up” of the bond.

2-13. Operation under Dusty or SandyConditions

Under extremely dusty or sandy conditions,extra care must be exercised when cleaning theplotting board so that scratching of the trans-parent plastic s u r f a c e s d o e s n o t o c c u r .Such scratching will damage the transparentquality of the base grid and azimuth disk sur-faces. Excessive scratching will cause damageand/or destruction of the lines of the vernierand scales and render the plotting board difficultto read and/or useless. Shake all dust and sandfrom the carrying case.

CHAPTER 3

MAINTENANCE lNSTRUCTIONS

Section I. REPAIR PARTS,

3-1. General

Repair parts, tools, and equipment are issued ifnecessary to the using organization for operatingand maintaining plotting board M17. Tools andequipment should not be used for purposes otherthan prescribed and, when not in use, should beproperly stored.

3-2. Repair Parts

Repair parts are supplied to the using organi-zation for replacement of those parts that become

TOOLS, AND EQUIPMENT

worn, broken or otherwise unserviceable. Theserepair parts are listed in appendix C which is theauthority for requisitioning replacements.

3-3. Common Tools and Equipment

No standard or commonly used tools and equip-ment are required or authorized.

3-4. Special Tools and Equipment

No special tools and equipment are requiredfor the plotting board M17.

Section II. PREVENTIVE-MAINTENANCE SERVICES

3-5. General

a. Responsibility and Intervals. The primaryfunction of preventive maintenance is to preventthe materiel from becoming unserviceable and,therefore, requiring repair or replacement. Thepreventive-maintenance services are the respon-sibility of the using organization. These servicesgenerally consist of before-operation, during-operation, and after-operation services performedby the operator and the scheduled services to beperformed at designated intervals by the organ-izational, field, and depot mechanic when neces-sary. Intervals are based on normal operationsor severe conditions. Intervals during inactiveperiods may be extended accordingly.

b. Definition of Terms. The general inspectionof plotting board M17 and carrying case M72is generally a check to see whether the itemsare in good condition and not excessively dam-aged or worn.

(1) The inspection for “good condition” isusually an external visual inspection to deter-mine whether the unit is damaged beyond serv-iceable limits. The term “good condition” is de-fined as being not bent, warped, or twisted; notchafed or burred; not broken or cracked; not

frayed, dented, torn or cut; and not mildewed ordeteriorated.

(2) By “excessively worn” is meant wornbeyond serviceable limits or to a point likely toresult in failure if the item is not replaced be-fore the next scheduled inspection.

3-6. Cleaning

a. General. General cleaning instructions areoutlined in b and c below.

b. Metal and Plastic Parts.

(1) When the plastic disk or plastic basesurfaces become dirty, they may be wiped withlens tissue paper, or with a clean cloth, mois-tened with lens-cleaning liquid soap. When clean,dry carefully by gently rubbing with lens tissueor clean cloth.

(2) Do not clean the plastic disk or basewith dry-cleaning solvent, alcohol, acetone, orother solvents.

(3) Clean the metal snap fastener on carry-ing case M72 with dry-cleaning solvent. Wipedry and apply a light film of light grade aircraftinstrument lubricating oil or grease.

(4) Clean carrying case M72 with soap and

3-1

water when this is considered necessary. Allowthe case to dry thoroughly before using it tostore the plotting board.

c. General Precaution in Cleaning.

(1) Dry-cleaning solvents, referenced inTM 9–247, are flammable and shall be kept awayfrom heat and open flame. Fire extinguishersshould be provided or immediately availablewhen these materials are used. Use only in well-ventilated places.

(2) The use of diesel fuel oil, gasoline,benzene (benzol), carbon tetrachloride, alcohol,and/or acetone, and all other unapproved clean-ing compounds or liquids, is prohibited.

3–7. Preventive-Maintenance Services

a. Purpose. To insure efficient fulfillment oftheir designed purpose, it is necessary that

plotting board M17 and carrying case M72 besystematically inspected at intervals each dayit is operated, so that defects may be discoveredand corrected before they result in serious dam-age or failure. Certain scheduled maintenanceservices (table 3–1) shall be performed at thesedesignated intervals. Any defects or unsatisfac-tory operating characteristics of plotting boardM17 and carrying case M72, that cannot be re-medied or repaired by the organizational main-tenance personnel shall be sufficient cause forreplacement.

b. Services. Preventive-maintenance serviceslisted in table 3–1 will apply primarily to theoperator. However, those services will also applyto organizational, field, and depot personnel whomay have occasion to use, stow, store, package,or ship plotting board M17 and carrying caseM72.

3-2

Table 3–1. Periodic Maintenance Checks and Service1st Echelon Daily Schedule

3-62-3f

3-6

2-123-6

2-132-13, 3-6

3 - 3

Section II. TROUBLESHOOTING

3-8. Scope table 3-2 is one of determining malfunctions,Troubleshooting is the systematic isolation of their probable causes, and the necessary correc-

inoperable or defective components by means of tive actions required to remedy the malfunction.symptoms and tests. Corrective actions that are beyond the scope of

3–9. Procedure the operator will be taken by the organizational,

The troubleshooting procedure described in field, or depot maintenance personnel.

3 - 4

Table 3–2. Troubleshooting

3-5

Section IV. REPAIR OF PLOTTING BOARD M17 AND CARRYING CASE M72

3-10. General 3-11. Maintenance

Repair of plotting M17 and/or carrying case If carrying case M72 (fig. 1–1) becomes worn,M72 is not authorized. damaged, or destroyed in such a manner as to

render it an inadequate protection for plottingboard M17, it should be replaced as authorized inappendix C.

3-6

CHAPTER 4

FINAL INSPECTION

4-1. General is in good condition (para. 3–5b(l)), it shall be

Final inspection of Plotting board M17 and stowed or placed in storage.

Carrying case M72 will consist primarily of avisual inspection of the materiel by organiza- 4-3. Excessively Worntional, field, or depot maintenance personnel.

When it has been determined that the material4-2. Good Condition is excessively worn (para 5-3b (2)), it should be

When it has been determined that the materiel replaced in accordance with appendix B.

4 - 1

PROCESSING AND

DESTRUCTION

CHAPTER 5

PACKAGING

TO PREVENT

SHIPMENT AND

ENEMY USE

Section I. PROCESSING, PACKAGING AND SHIPMENT

5-1. Processing and Packaging ing case M72, and the technical manual TMFor instructions for processing and packaging 9–1220–223–14, the officer in charge of preparing

plotting board M17, carrying case M72, and TM shipments will be responsible for plotting board9–1220–223–15, refer to ML-P-116. M17 being shipped in a serviceable condition,

5-2. Shipping Instructions properly packaged, and packed, including theWhen shipping the plotting board M17, carry- preparation of Army shipping documents.

Section Il. DESTRUCTION

5-3. General

a. Destruction of plotting board M17subject to capture or abandonment in the

OF MATERIEL TO PREVENT ENEMY USE

whencom-

bat zone will be undertaken by the using armonly when, in the judgement of the unit com-mander concerned, such action is necessary inaccordance with orders or policy established bythe army commander.

b. The information which fol lows is forguidance only. Certain of the procedures out-lined require the use of explosives and incendiarygrenades which normally may not be authorizeditems of issue to the using organization. The issueof these and related materials and the conditionsunder which destruction will be effected are com-mand decisions in each case, according to thetactical situation. Of the several means of de-struction, those most generally applicable areindicated in (1) through (4) below.

(1) Mechanical which requires an axe, pickmattock, sledge, crowbar, or similar implement.

(2) Burning which requires gasoline, oil,incendiary grenades, and other flammables, or awelding or cutting torch.

(3) Demolition which requires suitable ex-plosives or ammunition and gunfire, utilizingartillery, machine guns, rifles with rifle grenades,or launchers with antitank rockets. Under somecircumstances, hand grenades may be used.

Note. These methods are generally applicable onlywhen the plotting board is to be destroyed in conjunctionwith other equipment.

(4) Disposal which requires burying in theground, dumping in streams, or marshes, orscattering so widely as to preclude recovery ofessential parts.

c. In general, destruction of essential partsfollowed by burning will be sufficient to renderthe material useless. However, selection of theparticular method of destruction requires imagi-nation and resourcefulness in the utilization ofthe facilities at hand under the existing condi-tions. Time is usually critical.

d. If destruction to prevent enemy use is re-sorted to, the materiel must be so badly damagedthat it cannot be restored to a usable conditionin the combat zone either by repair or cannibali-zation. Adequate destruction requires that allparts essential to the operation of the materiel,including essential spare parts, be, destroyed ordamaged beyond repair. However, when lack oftime and personnel prevent destruction of allparts, priority is given to the destruction ofthose parts most difficult to replace. Equally, im-portant, the same essential parts must be de-stroyed on all like materiel, so that the enemycannot construct one complete unit from severaldamaged ones.

e. If destruction by demolition or gunfire is

5-1

directed, due consideration should be given tothe observance of appropriate safety precautions.

5-4. Procedures for Destruction of PlottingBoard M17

a. Method No. 1—By Mechanical Means.

(1) Remove the plotting board from itscarrying case.

(2) Using ansimilar implement,smashing the base,face, and azimuthminutes.

axe, pick mattock, sledge, ordestroy the plotting board bydestroying the base grid sur-disk. Elapsed time: about 2

b. Method No. 2—By Burning.

(1) Remove the plotting board from theCarrying case.

(2) Using a welding or cutting torch, burn

the base, base grid surface, and azimuth disk.Elapsed time: about 3 minutes.

(3) In the absence of a welding or cuttingtorch, place the plotting board on a pile of com-bustible. Pour gasoline or oil over the combusti-ble and over the plotting board; ignite and takecover. A hot fire is required to render the mate-riel useless.

Warning: When igniting gasoline, dueconsideration shall be given to the highly flam-mable and explosive nature of gasoline and itsvapor. Carelessness in its use may result in pain-ful burns.

Elapsed time: about 2 minutes.

c. Method No. 3—BY Disposal. Bury the plot-ting board in a suitable hole or throw it into astream. Elapsed time: about 2 minutes.

5-2

APPENDIX A

REFERENCES

A-1. Publication Indexes

The following indexes will be consulted frequently for latest changes or revisions of reference givenin this appendix and for new publications relating to materiel covered in this technical manual.

Index of Administrative Publications - - - - - - - - - - - - - - - - - - - - - DA PAM 310-1Index of Blank Forms - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - DA PAM 310–2Index of Supply Catalogs and Supply Manuals - - - - - -- - - - - - - - - - - - - - - - - - - - - - - - - DA PAM 310–GIndex of Technical Manuals, Technical Bulletins, supply Bulletins, Supply Man- DA PAM 310-4

uals (types 7, 8, and 9) and Lubrication Orders.Index of Training Services - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - DA PAM 310-3Modification Work Orders - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - DA PAM 310–7

A-2. Forms

DA Form 9–l, Materiel Inspection TagDA Form 829, Rejection MemorandumDA Form 2028, Recommended Changes to DA PublicationsDD Form 6, Report of Damaged or Improper ShipmentDD Form 250, Materiel Inspection and Receiving Report

A-3. Other Publications

a. General

Accident Reporting and Records - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - - - - -Army Equipment Record Procedurs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Authority Abbreviations and Brevity Codes - - - - - - - - - - - - - - - - - - - - - - - - - - -Dictionary of United States Army Terms - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

b. Maintenance

Command Maintenance Management Inspection - - - - - - - - - - - - - - - - - - - - - - - - - - - - -General Maintenance Procedures for Fire Control Materiel - - - - - - - - - - - - - - - - - - - -

c. Shipping and Storage

Logistics (General): Report of Damage or Improper Shipment Markings andPacking of Supplies and Equipment. Marking of Supplies and Shipment.

Paper Lens Tissue Anti-Tarnish Wrapping - - - - - - - - - - - - - - - - - - - - - - - -Preservation, Methods of - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -Preservation, Packaging and Packing - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

AR 385-40TM 38-750AR 310–50AR 310–25

AR 750-8TM 9-254

AR 700-58

MIL-P-13988AR 700–15MIL-P-116

A-1

APPENDIX B

MAINTENANCE ALLOCATION CHART

Section I. INTRODUCTION

B-1. General

This Maintenance Allocation Chart designatesoverall responsibility for the performance ofmaintenance functions on the identified end itemor component. The implementation of field main-tenance tasks upon this end item or componentwill be consistent with the assigned maintenanceoperations.

B-2. Maintenance Functions

Maintenance functions will be limited to anddefined as follows:

a. Inspect. To determine serviceability of anitem by comparing its physical, mechanical andelectrical characteristics with established stand-ards.

b. Test. To verify serviceability and to detectelectrical or mechanical failure by use of testequipment.

c. Service. To clean, to preserve, to charge andto add fuel, lubricants, cooling agents, and air.If it is desired that elements, such as paintingand lubricating, be defined separately, they maybe so listed.

d. Adjust. To rectify to the extent necessaryto bring into proper operating range.

e. Align. To adjust specified variable elementsof an item to bring to optimum performance.

f. Calibrate. To determine the corrections tobe made in the readings of instruments or testequipment used in precise measurement. Con-sists of the comparison of two instruments, oneof which is a certified standard of known ac-curacy, to detect and adjust any discrepancy inthe accuracy of the instrument being comparedwith the certified standard.

g. Install. To set up for use in an operationalenvironment such as an emplacement, site, orvehicle.

h. Replace. To replace unserviceable items withserviceable assemblies, subassemblies, or parts.

i. Repair. Those maintenance operations neces-sary to restore an item to serviceable conditionthrough correction of material damage or a spe-cific failure. Repair may be accomplished at eachcategory of maintenance.

j. Overhaul. Normally, the highest degree ofmaintenance performed by the Army in order tominimize time work in process is consistent withquality and economy of operation. It consists ofthat maintenance necessary to restore an item tocompletely serviceable condition as prescribed bymaintenance standards in technical publicationsfor each item of equipment. Overhaul normallydoes not return an item to like new, zero mileage,or zero hour condition.

k. Rebuild. The highest degree of materielmaintenance. It consists of restoring equipmentas nearly as possible to new condition in accord-ance with original manufacturing standards. Re-build is performed only when required by oper-ational considerations or other paramount factorsand then only at the depot maintenance cate-gory. Rebuild reduces to zero the hours or milesthe equipment, or component thereof, has beenin use.

l. Symbols. The uppercase letter placed in theappropriate column indicates the lowest level atwhich that particular maintenance function isto be performed.

B-3. Explanation of Columns

Listed below is an explanation of the columnsshown in the maintenance allocation chart:

a. Column 1, Group Number. Column 1 listsgroup numbers, the purpose of which is to iden-tify components, assemblies, subassemblies andmodules with the next higher assembly.

b. Column 2, Functional Group. Column 2

B-1

lists the noun names of components, assemblies, d. Column 4, Tools and Equipment. This col-subassemblies and modules on which maintenance umn shall be used to specify, by code, those toolsis authorized. and test equipment required to perform the

c. Column 9, Maintenance Functions. Column designated function.3 lists the lowest level at which that particularmaintenance function is to be performed. e. Column 5, Remarks. Self-explanatory.

B-2

Nomenclature of End Item or Component

PLOTTING BOARD M17

SECTION II—MAINTENANCE ASSIGNMENT

B - 3

APPENDIX C

BASIC ISSUE ITEMS LIST ORGANIZATIONAL, DIRECT

SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE

REPAIR PARTS AND SPECIAL TOOLS LIST

This manual is current as of 24 May 1971.

Section I. INTRODUCTION

C-1. Scope

This appendix is a list of repair parts andspecial tools and equipment for the performanceof Operator, Organizational, Direct Support,General Support and Depot Maintenance forPlotting Board Ml7.

C-2. GeneralThis Repair Parts and Special Tools List is

divided into the following sections.

a. Basic Issue Items List-Section II. A listof items which accompany the plotting boardM17 and are required by the operator/crew forinstallation, operation, or maintenance.

b. Maintenance and Operating Supplies—Sec-tion III. Not applicable.

c. Prescribed Load A Allowance (PLA) —Sec-tion IV. A composite listing of the repair partsand special tools, test and support equipmenthaving quantitive allowances for initial stockageat the organizational level.

d. Repair Parts for Organizational Mainte-nance-Section V. Not applicable.

e. Speciul Tools, Test and Support Equipmentfor Organizational Maintenance-Section VI. Alist of special tools, test, and support equipmentauthorized for the performance of maintenanceat the organizational level.

f. Repair Parts for Direct Support, GeneralSupport and Depot Maintenance-Section VII.Not applicable.

g. Special Tools, Test and Support Equipmentfor Direct Support, General Support and DepotMaintenunee —Section VIII . A list of specialtools, test and support equipment authorized for

the performance of maintenance at the directsupport, general support, and depot level.

h. Federal Stock Number and Reference In-dex-Section IX. A list of Federal stock numbersin ascending numerical sequence followed by alist of reference numbers in ascending alpha-numeric sequence, cross-referenced to the illustra-tion figure number and item number.

C-3. Explanation of ColumnsThe following provides an explanation of col-

umns in the tabular list in Sections II throughV I I I

a. Source, Maintenance and RecoverabilityCode (SMR).

(1) Source code, indicates the selection sta-tus and source for the listed item. Source codesare:Code Explanation

P Repair parts, Special Tools, and Test Equip-ment supplied from the GSA/DSA, or Armysupply system, and authorized for use atindicated maintenance categories.

P2 Repair Parts, Special Tools, and Test Equip-ment which are procured and stocked forinsurance purposes because the combat ormilitary essentiality of the end item dictatesthat a minimum quantity be available in thesupply system.

P9 Assigned to items which are NSA design con-trolled: Unique repair parts special tools,test, measuring and diagnostic equipment,which are stocked and supplied by the ArmyCOMSEC Logistic System and which are notsubject to the provisions of AR 380-41.

Pl0 Assigned to items which are NSA design con-trolled: Special tools, test, measuring anddiagnostic equipment for COMSEC supportwhich are accountable under the provisionsof AR 380-41, and which are stoked and

C-1

Explanation Code ExplanationCode

M

A

X

G

supp l i ed by the Army COMSEC Log i s t i cSystem.

Repair Parts , Special Tools, and Test Equip-ment which are not procured or stocked, ass u c h , i n t h e s u p p l y s y s t e m b u t a r e t o b em a n u f a c t u r e d a t i n d i c a t e d m a i n t e n a n c elevels.

Assemblies which are not procured or stockedas such, but are made up of two or moreunits. Such component units carry individuals t o c k n u m b e r s a n d d e s c r i p t i o n s , a r e p r o -c u r e d a n d s t o c k e d s e p a r a t e l y a n d c a n b eassembled to form the required assembly atindicated maintenance categories.

Pa r t s and a s semb l i e s t ha t a r e no t p rocu redor stocked because the fai lure rate is nor-mally below that of the applicable end itemor component . The fai lure of such parts orassembly should result in ret irement of theend item from the supply system.

X1 Repair Parts which are procured or s tocked.The requirement for such items will be filledby the next higher assembly or component .

X2 Repair Parts , Special Tools, and Test Equip-m e n t w h i c h a r e n o t s t o c k e d a n d h a v e n oforeseen mortal i ty. The indicated mainten-a n c e c a t e g o r y r e q u i r i n g s u c h r e p a i r p a r t sw i l l a t t emp t t o ob t a in t he pa r t s t h roughcannibalization or salvage, if not obtainablethrough cannibalization or salvage, the itemmay be requisi t ioned with exception data,from the end i tem manager, for immediateuse.

M a j o r a s s e m b l i e s t h a t a r e p r o c u r e d w i t hPEMA funds for ini t ial issue only as ex-change assemblies at DSU and GSU level .These assemblies will not be stocked abovethe DS and GS level or returned to depotsupply level.Note. Cannibalization or salvage maybe used

as a source of supply for any i tems sourcecoded above except those coded Xl and air-craft support i tems as restr icted by AR 700–42.

(2) Maintenance Code, indicates the lowestcategory of maintenance authorized to installthe listed item. The maintenance level codes are:

Code Explanation

C Operator/crewO Organizational MaintenanceF Direct support maintenanceG General support maintenanceD Depot maintenance

(3) Recoverability Code, indicates whetherunserviceable items should be returned for re-covery or salvage. Items not coded are expend-able. Recoverability codes are:

Code Explanation

R Applies to repair parts (assemblies and com-ponents) special tools and test equipmentwhich are considered economically repair-able at direct and general support mainten-ance levels. When the item is no longer

economically repairable, i t is normally dis-posed of at the GS level. When supply con-s i d e r a t i o n s d i c t a t e , s o m e o f t h e s e r e p a i rpa r t s may be l i s t ed fo r au toma t i c r e tu rnt o s u p p l y f o r d e p o t l e v e l r e p a i r a s s e tforth in AR 710-50. When so l is ted, theywil l be replaced by supply on an exchangebasis.

S Repair parts, special tools, test equipment, andassemblies which are economically repairableat DSU and GSU activi t ies and which nor-m a l l y a r e f u r n i s h e d b y s u p p l y o n a n e x -change basis. When i t ems a r e de t e rminedby a GSU to be uneconomically repairable,they will be evacuated to a depot for eval-uation and analysis before final disposition.

T Higher dollar value recoverable repair parts ,special tools, and test equipment which aresubject to special handling and are issuedon an exchange basis . Such i tems wil l beevacuated to the depot for overhaul or finaldisposition. Communications-Electronics andMissile Support Items will be repaired/over-hauled only at depots.

U Repair parts, special tools, and tests equipmentspecifically selected for salvage by reclama-t ion units because of precious metal con-tent, critical materials, high dollar value, orreusable casings or cast ings.

Note. When no code is indicated in the recov-erabil i ty column, the part wil l be considerednon-recoverable.

b. Federal Stock Number Column. This col-umn indicates the Federal stock number assignedto the item and will be used for requisitioningpurposes.

c. Description Column. This column indicatesthe Federal item name and, any additional de-scription of the item required. The abbreviation“W/E”, when used as a part of the nomenclature,indicates the Federal stock number includes allarmament, equipment, accessories, and repairparts issued with the item. A part number orother reference number is followed by the appli-cable five-digit Federal supply code for manu-facturers in parentheses.

d. Unit of Measure (U/M). A 2 characteralphabetic abbreviation indicating the amountor quantity of the item upon which the allow-ances are based, e.g., ft, ea, pr, etc.

e. Quantity Incorporated in Unit. This columnindicates the quantity of the item used in theassembly or the portion illustrated. A “V” ap-pearing in this column in lieu of a quantityindicates that a definite quantity cannot be in-dicated (e.g., shims, spacers, etc.).

f. Quantity Furnished With Equipment. Thiscolumn indicates the quantity of an item fur-nished with the equipment.

C-2

g. 15-Day Organizational Maintenance Allow-ance.

(1) The allowance columns are divided intofour subcolumns. Indicated in each subcolumnopposite the first appearance of each item is thetotal quantity of items authorized for the num-ber of equipments supported. Subsequent appear-ances of the same item will have the letters“REF” in the allowance columns. Items author-ized for use as required but not for initial stock-age are identif ied with an asterisk in theallowance column.

(2) The quantitative allowances for organi-zational level of maintenance represents oneinitial prescribed load for a 15-day period forthe number of equipments supported. Units andorganizations authorized additional prescribedloads will multiply the number of prescribedloads authorized by the quantity of repair partsreflected in the density column applicable to thenumber of items supported to obtain the totalquantity of repair parts authorized.

(3) Organizational units providing mainte-nance for more than 100 of these equipments shalldetermine the total quantity of parts requiredby converting the equipment quantity to a de-cimal factor by placing a decimal point beforethe next to last digit of the number to indicatehundredths, and multiplying the decimal factorby the parts quantity authorized in the 51–100allowance column. Example, authorized allow-ance for 51–100 equipment is 40; for 150 equip-ments multiply 40 X 1.50 or 60 parts required.

(4) Subsequent changes to allowances willbe limited as follows. No change in the range ofitems is authorized. If additional items are con-sidered necessary recommendations should beforwarded to Commanding Officer, FrankfordArsenal, ATTN: AMSWE–SMF–W3100 Phila-delphia, Pennsylvania 19137, for exception orrevision to the allowance list. Revisions to therange of items authorized will be made by theCommanding Officer, Frankford Arsenal, ATTN:AMSWE-SMF-W3100, Philadelphia, Pennsyl-vania 19137, based upon engineering ex-perience, demand data, or TAERS information.

h. 30-Day DS/GS Maintenance Allowan.ces.

Note. Allowances in GS Column are for GS maintenanceonly.

(1) The allowance columns are divided intothree subcolumns. Indicated in each subcolumn,opposite the first appearance of each item, is thetotal quantity of items authorized for the numberof equipments supported. Subsequent appearancesof the same item will have the letters "REF”

in the applicable allowance column. Items au-thorized for use as required but not for initialstockage are identified with an asterisk in theAllowance Column.

(2) The quantitive allowances for DS/GSlevels of maintenance will represent initial stock-age for a 30-day period for the number of equip-ment supported.

(3) Determination of the total quantity ofparts required for maintenance of more than 100of these equipments can be accomplished by con-verting the equipment quantity to a decimalfactor by placing a decimal point before the nextto last digit of the number to indicate hundred-ths, and multiplying the decimal factor by theparts quantity authorized in the 51–100 allow-ance column. Example, authorized allowance for51–100 equipments is 40; for 150 equipmentsmultiply 40 by 1.50 or 60 parts required.

i. 1-Year Allowance Per 100 Equipments/Contingency Planning Purposes. This columnindicates opposite the first appearance of eachitem the total quantity required for distributionand contingency planning purposes. The range ofitems indicates total quantities of all authorizeditems required to provide for adequate support of100 equipments for one year.

j. Depot Maintenance Allowance Per 100Equipments. This column indicates opposite thefirst appearance of each item, the total quantityauthorized for depot maintenance of 100 equip-ments. Subsequent appearances of the same itemwill have the letters “REF” in the allowancecolumn. Items authorized for use as required butnot for initial stockage are identified with anasterisk in the allowance column.

k. Illustration Column. This column is dividedas follows:

(1) Figure number column, Indicates thefigure number of the illustration on which theitem is shown.

(2) Item number column. Indicates the callout number used to reference the item in theillustration.

C-4. Special Information

Action change codes indicated in the left handmargin of the listing page denote the following:

N—Indicates an added item not included inprevious publications.

C—Indicates a change in data.F—Indicates a change in FSN only.

C-3

C-5. How to locate Repair Parts

a. When Federal stock number or referencenumber is unknown.

(1) First. Using the table of contents, de-termine the assembly group to which the repairparts belong.

(2) Second. Find the illustration coveringthe assembly group to which the repair partbelongs.

(3) Third. Identify the repair part on theillustration and note the illustration figure anditem number of the repair part.

(4) Fourth. Using the Repair Parts Listing,find the assembly group to which the repair partbelongs and locate the illustration figure anditem number noted on the illustration.

b. When Federal stock number or referencenumber is known.

(1) First. Using the index of Federal Stock

Numbers and Reference Numbers find the per-tinent Federal stock number or reference num-ber. This index is in ascending FSN sequencefollowed by a list of reference numbers in as-cending alpha-numeric sequence, cross-referencedto the illustration figure number and item num-ber.

(2) Second. Using the Repair Parts List-ing, find the assembly group of the repair partand the illustration figure number and itemnumber referenced in the index of Federal StockNumbers and Reference Numbers.

C-6. AbbreviationsAbbreviation Explanation

W/E With equipment

C-7. Federal Supply Codes for ManufacturersCode Manufacturer

19200 F r a n k f o r d A r s e n a lPhiladelphia, Pa. 19137

C-4

Section Il. BASIC ISSUE ITEMS LIST

1-1

1-1

1-1

C-5

Section Ill. MAINTENANCE AND OPERATING SUPPLIES

C-6

Section IV. PRESCRIBED LOAD ALLOWANCE LIST

C - 7

Section V. REPAIR PARTS FOR ORGANIZATIONAL MAINTENANCE

C-8

Section VI. SPECIAL TOOLS, TEST AND SUPPORT EQUIPMENTFOR ORGANIZATIONAL MAINTENANCE

1 - 1

C-9

C-10 Section VII. REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE

C-11

Section Vlll. SPECIAL TOOLS, TEST, AND SUPPORTAND DEPOT

EQUIPMENT FOR DIRECT SUPPORT, GENERAL SUPPORTMAINTENANCE

1-1

Section IX. INDEX–FEDERAL STOCK NUMBER AND REFERENCE NUMBER CROSS-REFERENCED TOFIGURE AND ITEM NUMBER

1-1 1 - 1

1 - 11 - 1

1-1

C-12

INDEX

1-2b2-101 - 4 b ( 2 )

1 - 12 - 61 - 3

1 - 4 b ( 1 ) 1 - 13 - 1 03 - 1 13 - 2

3 - 63 - 63 - 1

3 - 6 a3 - 6 b3 - 6 c

3 - 13 - 13 - 2

1 - 5

1 - 41 - 41 - 1

2 - 9 a 2 - 45-35 - 21 - 5 a

5 - 15 - 11 - 4 2 - 9 b 2 - 5

1-6 1 - 42 - 9 c2 - 9 d1 - 1

2 - 52 - 61 - 1

2 - 22 - 12 - 3

2 - 12 - 12 - 14 - 2

4 - 14 - 31 - 2 a

4 - 14 - 14 - 11 - 1

5 - 1 5 - 1

3-1 3 - 1 5 - 2 5 - 1

3 - 53 - 5 a3 - 73 - 5 b

3 - 13 - 13 - 23 - 1 (table

2 - 1 2 - 6 2 - 2

1 - 5 b 1 - 4 (table 3-1) 3 - 73 - 8

3 - 23 - 4(table 3-2)

2 - 1 32 - 1 22 - 1 1

2 - 62 - 62 - 6

3 - 33 - 4

3 - 13 - 1

2 - 42 - 52 - 6 b2 - 72 - 6 a2 - 6

2 - 12 - 12 - 22 - 32 - 22 - 2

3 - 83 - 9

3 - 43 - 4

2 - 8 2 - 4

I-1

By Order of the Secretary of the Army.

Official:VERNE L. BOWERS,Major General, United States Army,

W. C. WESTMORELAND,General, United States Army,Chief of Staff.

The Adjutant General.

Distribution:

To be distributed inments for Board Plotting.

accordance with DA Form 12-41 (qty rqr Block #10), Operator require-

U.S. GOVERNMENT PRINTING OFFICE : 1990 - 261-872 (21221)

PIN : 026550 - 000

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