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https://ntrs.nasa.gov/search.jsp?R=19690001151 2018-05-07T14:59:18+00:00Z
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FINAL REPORT
FOR
AIR BEARING PLATFORM, T50-2
31 October 1967
H. FornoffProgram Development ManagerSpace Maneuvering DevicesResearch, Engineering & Test
Reporting PeriodCovering 1 July through 31 October 1.967
Prepared fer: George C. Marshall Space Flight Center4untsvtlle, Alabama 35812
SPACE MANEUVERING DEVICES
SPACE DIVISION of NORTH AMERICAN ROCKWELL CORPORATION12214 LAKEWOOD BLVD., DOWNEY, CALIFORNIA
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FIIVAT RV,PORT
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AIR HEARING PLATFORM, T50-2
NAS8-20855 31 October 1967
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H. FornoffProgram Development ManagerSpace Maneuvering DevicesResearch, Engineering & Test
Reporting PeriodCovering 1 July throu h 31 October 1967
Prepared for: George C. Marshall Space Flight CenterHvntsyi]le, Alabama 35812
SPACE MANEUVERING DEVICES
SPACE DIVISION of NORTH AMERICAN ROCKWELL CORPORATION-12214 LAKEWOOD BLVD., DOWNEY, CALIFORNIA
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NORTH. AMERICAN AVIATION, INC.
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FOREWORD
This Final Report prepared by the Maneuvering Devices Groupof the Space Division-of North American Rockwell Corp., forthe Marshall Space Flight Center under Contract NAS8-2Q855,describes the design regydrements and provides a brieffunctional description of the Air Bearing Platforms T50-2designed and fabricated under this conL+act.
Additionally, this report recapitulates all documents pre-pared in conjunction with the contract and itemizes thedrawings being furnished separately.
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TABLE OF CONTENTS
04
1.0 Description
1. General
1.2 Performance Characteristics
1.2.1 System
1.2.2 Operating Instructions
1.2.3 Mechanical
1.2.4 Electrical
1.2.5 Pneumatic
1.2.6 Power
2.0 Scope
2.1 Final Design
2.1.1 Air Pressure Control
2.2 Tip Over Torques
1-0 Documm entation
3.1 Specifications
3.2 Drawings
3.3 Monthly Reports
4.0 Recommendations
LIST OF ILLUSTRATIONS
Frontispiece Air Bearing Platforms, T50-2, Serial 1 & 2
Figure 1 Air Bearing Platform, T50-2 Manned
Figure 2 Air Bearing Platform, T50-2 Unmanned
Appendix A WN-0385 "Engineering Evaluation: Blower MotorPerformance Parameters
Appendix B NASA Technology Report
Appendix C Proof Procedure (Acceptance Test) Model T50-2 AirBearing-Platform
Appendix D Acceptance Test Procedure, Model T50-2 Airy Bearing Platfcym
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1.0 DESCRIPTION
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1.1 GENERAL
This report contains a brief narrative describing the T50-2 Lightweight• Adjustable Air Bearing Platform and Support designed and fabricated
by the Space Maneuvering Devices group of the Space Division of NorthAmerican Rockwell Corporation, Downey, California, in support ofContract NAS8-20855, Herman T. Blaise, COR, for the National Aero-nautics and Space Administration,, George C. Marshall Space FlightCenter, Huntsville, Alabama.
The T50-2 Air Bearing Platform is designed to provide a stable basesimulated near-frictionless environment by means of air pads operatingon a level smooth floor. It is to be used in conjunction with theNASA Serpentuator or other manual propulsion operations. The T50-2has capability and versatility of being utilized in the studies andevaluations of docking; undocking, and other difficult simulatedspace maneuvers requiring simulated low friction environment 'throughthe use of air bearings.
1.2 PERFORMANCE CHARACTERISTICS
1.2.1 §ystemf
The T50-2 Air Bearing Platform supports a nominal 200-pound load onan equilateral three foot triangular base constructed of aluminumtubing. The platform configurations are shown on Drawing M0001047(see Section 3.2). The T50-2 has two configurations—they are (Figure1) the manned version including a wtn-seat pedestal and serpentuatorattach bracket, and the (Figure 2) unmanned version which only in--ludesthe serpentuator support bracket. The T50-2 base consists of a motor-blower combination, 3 air pads, an electrical control box, operator'scontrol treadle switch and operators motor speed control, and a 115VAC 60 cycle umbilical recoiling power cord with connector.
The platform flotation lifting height can be adjusted by speed controlof the blower-motor. The platform levelness due to unbalanced loadsis controlled by manually adjustabl® •valves which 'restrict the airflow delivery to each air pad.
1.2.2 Operating Instructions
Detailed operational and maintenance instructions are furnished inSMD-0110, "Service and Maintenance Manual for Air Bearing Platform,T50-21t.
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Figure 1 - Air BearingPlatform T50-2 Manned
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1.2.3 Mechanical
y The physical dimensions of the two configurations are shown onDrawing M0001047 (see Section 3.2). The weight of the mechanicalassemblies are:
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Platform Air Bearing T50-2 55 lbsSerpentuator Attach Post & M ,,acket 12 lbsSerpentuator Support, Post & Bracket 12 lbsOperator's Mast and Safety Yoke 18 lbs.
1.2.4 Electrical
The electrical system is shown on Draw3.ng M0001047 Sheet 2 (seeSection 3.0). The design of the electrical system provides for eithercontinuous unmanned control or operator's continuous control of theplatform flotation. The blower-motor is protected by a'10 ampere,combination circuit-breaker/toggle switch assembly. Choice of mannedand unmanned mode is selectable by a toggle switch mounted in theelectrical control box. The unmanned speed control is also containedin the electrical control box. The manned control is extended to theuse of a treadle foot switch and operator's safety yoke positionedblower-motor speed controller.
1.2..5 Pneumatic
The pneumatic system ism shown on Drawing M0001047 Sheet
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2 (see Section3_n) T sy s+v°m vv^atains 115 VAC 6v cyclo b .,i.Vwpr 9 a %AiQtr ibut..L.V1L
plenum chamber, three in--line air flow restrictor valves, and threeair pads. The electric blower is capable of supplying plenum pressureof 2.5 Psig up to flow deliveries of 15 scfm. (Refer to Appendix A,WIC-0385p Engineering Evaluation: Blower Motor Performance Parameters.)The three air pads are Capable of floating a total air platform loadin excess of 600 pounds.
1.2.6 Power„
The ohly power requirement necessary is a single phase 115 VAC 60 cycleat a^maximum current requirement of 10 amperes. This may be suppliedfrom any 115 VAC utility outlet box with a third wire safety groundpin. The safety ground, if not available at a standard wall outlet,
` may be provided through the use of a parallel ground adapter, whichad;gpts the 3-prong AC plug for use in standard 2--prong AC outlet. Inthis case, the parallel ground adapter lead wire must be connected toa suitable electrical safety ground point.
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2.0 SCOPE
Technical work performed during this contract as discussed in thetechnical proposal submitted to MSFC (SID 67-601-1) for the designof Air Bearing Platforms is rather straightforward. During thecontract negotiations, the COR, (H. T. Blaise) established, addi-tionally, certain fixed technical requirments; i.e.
1. The unit was to be powered by a 110V single phase, 60 cyclemotor.
2. Air bags, rather than precision air-pads were to be used.
3. The man support and serpentuator support details were toconform to established NASA designs.
Thus to a large extent the physical layout of components was theonly identifiable design task.
2.1 FINAL DESIGN
The final design requirements, negotiated during the contract, in-cluded provisions for air flow control other than by throttling theair supply to the air pads. Technical data received from thesupplier, indicated that the pads could support light weight as wellas heavy loads, but that variable input air pressures were requiredif light :;eight loads were not to create an instability. The com-meraial' -- available pads are made More tolerant of weight extremesby means of enlarging the air port to the pad. This is shown onDrawing M0001041 (see Section 3.0). The net effect is to drop thetotal lifting capability by about 30%, but in so doing, the lightestlead that the pads can support is more than halved.
2.1.1 Air Pressure Control
Remaini ng,,, was the problem of air pressure control. At the request ofthe COR a sim union of blower motor and air pad was provided alongwith a means for varying speed control. It turned out that voltagecontrol of the motor is an ideal way of controlling air flow; motorheat is proportional to I2R losses; pressure increases roughly squaredwith motor speed. Thus reduced pressure directly offsets motor heatrise. With less heat being generated, less cooling air is required.
The laboratory test is reported in WN-0365 dated 4 August 1967 and isreproduced as Appendix A. The work done under this contract on motorapeed.c,ontrol for air pressure variation was duly reported to NASATee:ology Utilization Group, at NAR on 12 October 1967. A copy ofthis report is reproduced as Appendix B.
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The actual implementation of this motor speed design is shown; onDrawing M0001047'Sheet 2 of 3 (see Section 3.2).
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2.2 TIP-OVER TORQUES
At the suggestion of the COR, the manned pedestal was loaded with150 lbs, 50 lbs over each air pad. A tip-over torque was then appliedto the Serpentuator Attach Bracket to determine whether there wereany unforeseen tip-over problems. The unit showed no rise from thenfloor until a torque of 12 foot-pounds was applied.
3.0 DOCUMENTATION
3.1 SPECIFICATIONS
Three specification, type documents were produced under this contract.They are:
SMD-0384-2 Rev. 23 October 1967 (Appendix C) - Proof Procedure(Acceptance Test) Model T50-2 Air Bearing Platform
WN-w0385 August 4, 1967 (Appendix A) - Engineering Evaluation:Blower Motor Performance Parameter s
WN-0389 August 21, 1967 (Appendix D) -- Acceptances Test Pro-cedure, Model T50-2 Air Bearing Platform.
3.2 DRAWINGS
Ten drawings were prepared under this contract. Reproducible draw-ings on a transparent plastic medium are being furnished as a separatedeliverable items on this contract. Drawings are of this date and re-vision.
Drawing Rev. Date Title
' ^D^ M0001041 - 10-20-67 Pad AssemblyD M0001042 - 10-10--67 Marking and Identification(D) M0001043 D 10-18-67 Bracket, Mounting, Ser-
pentuator(D) M0001044 D 10-18-6' Clsutp, Bracket Adjustment(D) M0001045 E 10-19-67 Pedestal, Serpentuator(J) M0001046 D 10--18-67 Pedestal, Man Support(J) 140001O47. Sht 1 D 10-2-67 Platform, Air Bearing(D) M0003047 Sht 2 E 10-24-67 Electrical Schematic(D) M0001047 Sht 3 E 10-"24-67 Lox, Electrical(D).M0001219 - 10-20-67 Control,.Remote
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3.3 MONTHLY REPORTS
In addition to the drawings and specifications referred to above,monthly reports were prepared along vai.th an Operational and Main-
.. tonance Manual..
REPORTS
F:° Date •- Reporting Period
67MA5735 21 July 19 ,67 1 July to l August 1967
67MA6372 12 September 1967 1 August t,o 31 August 1967
67MA6836 5 October 1967 1 Sept. to 30 Sept. 1967
SMD-0410 31 October 1967 Service & Maintenance Manual for AirBearing Platform, T50-2
4.'.0 RECOM ENDATIONS;Ym ,
All useful recommendations for design improvement were incorporatedwithin the two units, prior to shipment. These design changes arereflected in the drawing (.,iedf. Section 3.2) and Operational Manual(Ref.Section 1.2.2)
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APPENDIX A
R Miller
WN-0355August 4, 1967Page 1 of 6
ENGINEERING EVALUATION: BLOWER MOTOR PERFORMANCE PARAMETERS
Purpose of Evaluation:
This evaluation was made to determine the operational characteristic of a blowermotor in a plenum and air distribution breadboard representing the NASA T50-2Air Bearing Platform design approach. The specific characteristic being in-vestigated was the feasibility of pad air pressure control by the varying ofapplied motor voltage.
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Test Equipment :
Blower breadboard (see photograph, Figure 1) incorporating a Type 115 -'250 blower
Hovair Type XD 16014 Air Pad
HP 400H VTVM RMS Voltmeter
1.002 ohm Resistor (current shunt)
0 to 15 psi Duraguage Type Pressure Gage
6 inch, 0 to 29 SCFM Fischer-Portor Flow Meter
Copper-Constantin Thermocouples
Thermocouple Switch- Lewis . Engineering Instrument Company
L&N Type 5692 Temperature Potentiometer
115V 60 cps Variac GR Type W5MT
Evaluation Set UD:
Test equipment, and Tnstallat;! on are in Figure 2.
Evaluation Procedure
A nominal air pad performance condition.. was first established. This was accomplishedby flowing air with minimum restriction through the air pad loaded with a 230'poundweight and adjusting to the minimum required applied motor voltage to 1"loat the padat a.low fraction level. The plenum pressure was 1.0 psi at this condition. Padflow was determined by diverting all the air flow from the pad through the flow meter.
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WN-0385August 4,1967Page 2 of 6
With an applied voltage sufficient to float:, one pad at 230 pound load the flowat the valve was restricted until the plenum pressure was 1.0 psi, This flow,for one pad, was then measured as 3 SCFM (relative).
A nominal three pad flow condition was established as 9 SUM at 1.0 psi to floata 690 pound load using 3 SUM at 1.0 psi flow for one pad.
The evaluation was continued by varying the applied voltage and restrictor valvesetting to maintain a constant flow of 9 SUM. Motor load current,.stabilizedtemperatures, and pressures were measured for each setting. (Note: Q P in theZ inch diameter pipe at these flows was not measureable.) The same constantflow evaluations were re-run for 12 SUM and 15 SUM.
Evaluation Data:
Data obtained in the Test Runs are tabulated in Table L
Conclusions and Recommendations:
Referring to Figure 3, Plot$j of Recorded Data, it is apparent that the voltageapplied to the blower motor offers significant control of air pressure delivered.
Temperature rise of the blower as.measured at the frame end bearing is well with-in the allowable + 65°C. As expected for a given pressure setting, higher flowdemand only increases the volt-amp . power input to the motor. Greater flow alsoinduces more motor cooling due to increase air flowing through the .motor frame.
It is recommended that the T50-2 Air Bearing Platform blower motor be voltagecontrolled to permit setting of operating lift. This adjustment of appliedvoltage, gives the operator simple control over the previously difficult; parameteradjustments of pressure, and correlated air flow and lift. This is accomplishedby the use of a variable voltage transformer or through the use of an SCR motorspeed controller.
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WN-0385
August 4, 1967Page 3 of.,,6
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PREPARED BY: T • Miller NORTH AMERICAN AVIATION, INC. PAGE NO, OF 6SPACE and INFORMATION SYSTEMS DIVISION
CHECKED BY: Figure 2 REPORT NO. wN-0385
DATE: 7-31-67 Evaluation Experiment Setup MODEL NO.
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APPENDIX B
INTERNAL LETTER 67-092 EVA-140North American Aviation, Inc. Date 12 October 1967
TO A. Rothenberg FROM . H. FornoffR Address D/896 Address . D/092-120
AA33 BB287
Phone . 4667
• Subject New Technology Reporting Requirements. Contract NAS8-20855, G.O. 02202
In accordance with your letter of 7 July 1967,the attached IL'was this day forwarded to theTechnology Utilization Group, Attention: R. H.Paul.
tH. FornoffProgram Development ManagerSpace Maneuvering DevicesResearch, Engineering & Test
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INTERNAL LETTER 67-092-EVA-339North American Aviation, Inc. Date 12 October 1967
fi TO -Technology Utilization Group FROM H. FornoffAddress -Attn: R. H. Paul Address D/092-120
D/096-530 - BB28GB63
Phone •4667t
Sublet'. -New Technology Reporting Requirements• Contract NAS8-20855, G.O. 02202
r. In accordance with instructions received from Allan Rothenberg,I1, dated 7 July 1967, subject as above to H. Fornoff, you aread,rlsed that there are no patentable inventions or disclosuresemti sting from this contract.
rhere was one significant investigation conducted on or about31 July in the presence of the NASA COR, H. T. Blaise. Thisinvestigation concerned itself with the pressure control of an'electricall3r driven air pump, by means of voltage control of -the motor. Normally, pressure is controlled by o:^nstrictionisin the downstream side. This limits the volume of air acrossthe electric motor, the motor overheats and burns out. Byreducing the voltage 12R losses are reduced at about the samerate that the volume of cooling air is reduced.
The test results are reported in the attached WN-0385. Theredixict i_on to practice is 'shown' in drawing M0001047 , Sheet 2,released by EO 638167, attached.
The Project Engineer, D. Wolkov, advises tH gt there are noother disclosures to be made.
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^ 00^^• SMD-0384-2Design Assurance APPENDIX C October 23, 1967`=-.--
^^C/.Page 1 of
Project Engineer
Program Deve ment Manager
C Technidal,'Representative
PROOF PROCEDURE (ACCEPTANCE TEST) MODEL T50-2-AIR BEARING PLATFORM
Introduction
The Air Bearing Platform (T50-2) is designed to support a nominal 2.00 pounds andis an equilateral three foot triangular configuration composed of * 1 aluminumtubing covered with 1/8 11 aluminum sheet metal. The T50-2 consists of a motor andblower combination, 3 mylar air pads, a serpentuator mast, electrical master switch,operator l s treadle ("dead man e ) switch, treadle bypass switch and a 115 VAC 60cycle umbilical connector with provisions for mounting operator's mast and safetybroke.
ADDlicabilit
The purpose of the proof procedure of the T50-2 is to verify basic vehicle designstability operation and performance as a low friction support for serpentuatorsimulations. With «n operator securely positioned in the safet' y yoke and usingthe serpentuator or manual propulsion, the unit has the capability of performingdocking, undocking, and other difficult simulated space maneuvers on an air bear-ing floor.
Procedure
The T50-2 testing shall be performed in accordance with the Inspection and TestInstructions.
Documentation
All test activities, data, and anomalies shall be documented in the Vehicle LogBook and the Acceptance Test Data Sheet. Discrepancies found during , the testshall be recorded on the Squawk Sheet (Form M-25-U) attached.
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SMD-0384-2' October 23, 1967
Page fSTA. N0. NUMBERa TEST INSTRUCTIONS
INSPP, DEPT. TITLE RED.. ti ATEProof Procedure (Acceptance Test)
MFG. DEPT. PART NAME PART NO. REV. DATEAir Bearing Platform
MODEL NO. SERIAL NO. ORIGINATOR O. E.L. APPROVALT50-2 D. M. Rew PAGE l OF 2
NOTE: EXERCISE CARE TO AVOID DAMAGE TO AIR PADS
1. Verify instrumentation calibration due date and record.
2. Physically examine the T50-2 for manufacturing diserepancids and/or shippingdamage and record:
3. Weigh the T50-2 and record.
4. Measure and record motor case temperature (ambient) and record.
5. Place T50-2 on parking pad on air bearing floor.
6. Set air pad bypass valves to full open. (See Figure 1)
7. Connect the 115VAC 60 cycle umbilical; reel out sufficient electrical power cableto-accommodate preprogrammed travel of air bearing platform so as to prevent -unwanted automatic power cable retraction.
7a. Place mode switch in man mode position.
8. Close electrical master switch.
9. Close treadle bypass switch in order to actuate motor and blower, the unit is nowfloating on its air pads. Adjust and set variable speed control to providenecessary or adequate air flow.
10. Move T50-2 on air bearing floor surface and measure distance i.e. height of liftat each air pad from the floor to the bottom of the frame of the unit. Adjust airpad bypass valves individually to level patform and to obtain a clearance distanceof not less than 1 ± 0.25 inches. Record clearance:
11. Apply 50 pound (unbalanced) load over each air pad sequentially and readjust airpad valves to attain balance.
12. Observe performance for stability and minimal drift.
13. Set serpentuator attach brackets to approximate height.
11+. Attach serpentuator actuator.
15. Adjust inching 'mechanism to elitminate stress iti- serpentuator.-.
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INSP. DEPT, TITLE REL. DATEProof Procedure (Acceptance Test)
MFG, DEPT. PART NAME PART NO. REV. DATE
MODEL NO. SERIAL NO. ORIGINATOR O.E.L. APPROVAL.T50-2 D. M. Rew PAGE 2 OF 2
16. Open master switch to shut blower motor.
DO NOT MOUNT OR DISMOUNT FROM VEHICLE WHILE BLOINER MOTOR IS RUNNING
17. Offset operator weight with weights properly positioned over the center- of gravitto make up a load of 200 lbs.
18. Place mode switch to unmanned position and close master switch.
19. Verify the air pad valves setting; see Paragraph 10 (above).
20. Repeat Paragraph 12 (above).
21. Move platforms across floor; record stress in serpentuator. Select floor areawhich represents average condition as indicated by stress charts. Mark floorarea. (The Government will determine stress in the serpentuator with equipmentand personnel.available at time of proof testing.)
22. Return platforms to typical floor segment. Repeat Paragraph 15.
2. • rvs" LV ua s^^ yvn^uator ^ 10 u^tes, see Figure 4".
24. At midpoint and completion of test and after one (1)"hour of operation measure
a) Record motor case temperature rise (Temperature rise should not exceed65 °C.)
1b) Record stress at serpentuator attach points.
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SQUAWK SHEETPage_Z,.pf_7_
MAKE ENTRIES LEGIBLE - USE BALL POINT PEN WITH FIRM PRESSURE
MODEL PIN EN EFT. DATE .............................................................................
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Mech. Inspect. Cust.By DESCRIPTION OF DISCREPANCY AND ACTION TAKENand/or & &
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Design Assuran e
7ro—ject Engineer
Introduction
APPENDIX .D
ACCEPTANCE TEST PROCEDUREMODEL T50-2 AIR BEARING PLATFORM
WN-0389August 21, 1967Page 1 of 4
The Air Bearing Platform T50-2 is designed to support a nominal 200 pound3 and isan equalateral.three foot triangular configuration composed of 1 1/4 inch aluminumtubing enclosed with 1/8 inch aluminum sheet metal. The T50-2 consists of a motorand blower combination, three (3) mylar air pads, a serpentuator mast, electricalmaster switch,.•operator t s treadle ("dead man").swiitch, treadle bypass switch, anda 115 V AC 60 cycle umbilical connector with°provisions for mounting an operatortsmast and safety yoke.
ADDlicabilit
The purpose of the Acceptance Test of the , T5,0-2 is to verify basic vehicle designstability, operation, and performance as a low friction support for serpentuatorsimulations. With an operator securely positioned in the.safety yoke and usingthe serpentuator or manual propulsion, the unit has the capability of performingdocking, unlocking, and other difficult simulated space maneuvers on an air bear-ing floor.
Procedure
The T50-2 t lssting shall be performed in accordance with the Inspection and TestInstructions.
Documentation
All test ' aotivities, data and anomalies shall be documented in the Vehicle Log Bookand the Acceptance Test Sheet. Discrepancies found during the test shall be recordedon the Squawk Sheet (Form M-25-11).
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STA. NO,.INSPECTION a TEST INSTRUCTIONS
NUMBER
INSP. DEPT. TITLE REL. DATEAcceptance Test
MFG. DEPT. PART NAME PART NO. REV. DATEAir Bearing Platform
MODEL NO. SERIAL NO. ORIGINATOR
'
PPR VAT50-2 J. C. Fay W Vi, '^'^
PAGE z OF ¢
INOTE: EXERCISE CARE TO AVOID DAMAGE TO AIR PADS INSP.
1. Verify instrumentation calibration due date and record.
2. Physically examine the T50-2 for manufacturing discrepancies and/orshipping damage and record.
3. Weigh the T50-2 and record.
4. Measure and record motor case temperature (ambient) and record.
5. Place T50-2 on parking pad on air. bearing floor.
6. Set air pad bypass valves to mid-travel. (See Figure 1)
7. Connect the 115V AC * 60 cycle umbilical; reel ' out sufficientelectrical power cable to accommodate preprogrammed travel ofair bearing platform so as to prevent unwanted automatic powercable retraction.
S. Close electrical master switch.
9. Close treadle bypass switch in order to-actuate motor and blower, theunit is now floating on its air pads. Adjust and set variable speedcontrol to provide necessary or adequate air flow.
10. Move T50-2 on air bearing floor surface and measure distance i.e. heheight of lift at each air pad from the floor to the bottom of theframe of the unit. adjust air pad bypass valves r indi-vidually to levelplatform and to obtain a clearance distance of 1 ± 0.25 inches'. Recordclearance:
ll. Apply 50 pound (unbalanced) load over each air pad sequentially and_re-adjust air pad valves to attain balance.
12. Observe performance for stability and minimal gift.
13. Open master switch to shut off blower motor.
DO NOT MOUNT OR DISMOUNT FROM VEHICLE WHILE BLOWER .MOTOR IS RUNNING
14. Offset operator.weight, with weights properly positioned over the centerof gravity to make up • a load of 200 ttip±.
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August 21, 1967Page 2of, ! —
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INSP. DEPT. TITLE REL. DATEAcceptance Test
MFG. DEPT. PART NAME PART NO. REV. DATEAir Bearing Platform
MODEL NO.T50-2
SERIAL N0. ORIGINATORJ. C. Fay
PP . VAL^ ^^ PAGE -3 OF 4
INSPA15. Place treadle bypass switch to operate position and close master
switch.
3.6. Actuate foot treadle (blower motor should operate).
17. Verify the air pad valves setting; see Paragraph 10 (above).
18. Repeat Paragraph 12 (above).
19. At midpoint and completion of test andoperation measure and record motor caseperature rise Iahould not exceed 65 0C.)
after one (1) hour oftemperature rise. (Tem-
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