MIL-C-707BI (AR) 17 October 1988 MILITARY …everyspec.com/MIL-SPECS/MIL-SPECS-MIL-C/download... · specifications and standards form a part of this specification ... functioning

MIL-C-707BI (AR)17 October 1988

0

I

MILITARY SPECIFICATION

CARTRIDGE, 60MM: SMOKE, .MARKXNG, M722ASSEMBLING, MARKING AND PACKING

This Specification is approved for use within the U.S. ArmyArmament, Munitions and Chemical Command, and is available foruse by all Departments and,Agencies of the Department of Defense.

1. SCOPE

1.1 Scope. This specification covers requirements andquality assurance provisions for the assembling, marking, andpacking for one type of w cartridge, M722.

2. APPLICABLE DOCUMENTS

2.1 Government documents.

2.1.1 Specifications and standards. The followingspecifications and standards form a part of this specificationto the extent specified herein. Unless otherwise specified theissues of these documents shall be those listed in the issue ofthe Department of Defense Index of Specifications and Standards(DoDISS) and supplement thereto, cited in the solicitation.

SPECIFICATIONS

MILITARY

MIL-A-48078 - Ammunition, Standard QualityAssurance Provisions, GeneralSpecification for.

: Beneficialcommemts(recommendationa,additions,deletions)~ndany perthmntdntawh~chrmybeof useinhnprowing this documentshould be oddrewe$ to Commander. U.S. Army Armament, Munitions and ChemicalCommnnd,Attn. AMSMC-~A, Pic~~jnny Arsennl, New Jemey07W.W byusing the self-addr=edSmndardim-tionDocumentJmpravemen\ Proposal (DI) Form M2fi) appearing ottheedofthis documentorbylett@r.

AMsc N/A S?sc1310

a

DISTRIBUTIONSTATEMENTA. Approvedfor public release;distributionis unlimited.

Downloaded from http://www.everyspec.com

MIL-C-70781 (AR)

STANDARDS

MILITARY

MIL-STD-105

MIL-STD-41O

- Sampling Procedures and Tables forInspection by Attributes

- Nondestructive Testing PersonnelQualification and Certification(Eddy Current, Liquid Penetrant,Magnetic Particle, Radiographicand Ultrasonic)

MIL-STD-453 - Inspection, Radiographic

2.1.2 Other Government docum~nts, drawings and~blications. The following other Government documents,—Tdrawings, and publications form a part of this specification tothe extent specified herein. Unless otherwise specified, theissues shall be those in effect on the date of the solicitation.

US ARMY ARMAMENT RESEARCH, DEVELOPMENT AND ENGINEERING CENTER(ARDEC)

PRODUCT DRAWINGS (See 6.5)

PRODUCT AND PACKAGING DRAWINGS

15-12-345 - Cartridge, 60MM, Smoke, Marking, M72215-12-352 - Packing and Sealing for: 60MM Cartridge,

Smoke, Marking, M722 with M745 Fuze.15-12-358 - Intermediate Packing and Marking15-12-359 - Marking for Fiber Tube15-12-361 - Marking for Shipping Container9293440 - Box, Wirebound, Packing, Ammunition for 60MM

Cartridge, HE, M720 w/Fuze M734, Packingand Marking.

INSPECTION EQUIPMENT DRAWINGS

.

.

7256281 - Alignment Check Plug7256348 - Alignment Gage7257962 - Limit Check Gage9246386 - Inspection Equipment for Measuring Leakage of

Metal Ammunition Containers

2


MIL-C-70781 (AR)

1“

(Copies of specifications, standards, drawings and otherGovernment documents required by manufacturers in connectionwith specific acquisition functions should be obtained from thecontracting activity or as directed by the contracting officer.)

2.2 Order of precedence. In the event of a conflictbetween the text of this specification and the references citedherein (except ,forassociated detail specifications,specification sheeks or MS standards)~ the text Of thisspecification shall take precedence. Nothing in thisspecification, however, shall supersede applicable laws andregulations unless a specific exemption has been obtained.

3. REQUIREMENTS

3.1 Materials and components.

3.1.1 Materials. All materials cited on Drawing 15-12-345or the subsidiary drawings shall conform to the specificationslisted thereon and to the specific characteristics set forth onthe drawings.

3.1.2 Components. All components of the cartridge shallconform to the specifications and drawings listed on Drawing1!5-12-345 and subsidiary drawings.

3.1.3 Burster. When installed in the cartridge, theburster shall not rattle when tested as specified in 4.5.2.

3.2 Parts and assemblies. Parts and assemblies shallcomply with all requirements specified on drawing(dwg.)15-12-345 and associated drawings, and with allrequirements specified in applicable specifications andstandards.


MIL-C-70781 (AR)

3.3 Proving ground test. The cartridge shall comply withthe following requirements when tested as specified in firstarticle and 4.4.3;1.

3.3.1 Misfire. The cartridge shall not fail to fire fromthe weapon.

3.3.2 Premature burst. There shall be no prematurefunctioning in the mortar tube or within 100 meters travel fromthe gun tube.

3.3 Duds. There shall be visible evidence of functioning——upon impact as indicated by presence of a smoke cloud.

3.3.4 Metal parts separation. There shall be no metalparts separation in the gun bore or in flight.

3.3.5 Range precision. The horizontal range standarddeviation s=ll be no greater than 15 meters when fired atcharge zero, no greater than 55 meters when fired at charge twoand no greater than 75 meters when fired at charge four.

3.3.6 Short rounds. No cartridge shall have a horizontalrange less than 80 percent of the average horizontal range whencalculated without short rounds.

3.4 First article inspection. This specification containstechnical provisions for first article inspection. Requirementsfor the submission of first article samples by the contractorshall be as specified in the contract.

3.5 Workmanship. Parts shall be free from chips, burrs~cracks~ d= greaser corrosion~ rust and othef forei9nmaterial. The cleaning method shall not be in3urious to any ofthe parts nor shall the parts be contaminated by the cleaningagent.

4. QUALITY ASSURANCE PROVISIONS

4.1 Responsibility for inspection. Unless otherwises~ecified in the contract or purchase order~ the contractor is.responsible for the performance of all inspection requirementsas specified herein. Except as otherwise specified in thecontract or purchase order? the contractor may use his own orany other facilities suitable for the performance of theinspection requirements specified herein? unless disapproved bYthe Government. The Government reserves the right to performany of the inspections set forth in the specification where suchinspections are deemed necessary to assure supplies and servicesconform to prescribed requirements. Unless otherwise specifiedherein or in the contract, the provisions of MIL-A-48078 shallapply and are hereby made a part of this detail specification.

.

.

4


MIL-C-70781 (All)

4.1.1 Responsibility for compliance. All items must meetall requirements of sections 3 and 5. The inspections set forthin thi; specification shall become a part of tfiecontractorsoverall inspection system cm quality program. The absence ofany inspection requirements in the specification shall notrelieve the contractor of the responsibility of assuring thatall products or supplies submitted to the Government foracceptance comply with all requirements of the contract.Sampling in quality conformance does not authorize submission ofknown defective material, either indicated or actual, nor doesit commit the Government to acceptance of defective material.

4.1.2 Alternate. inspection provisions. Alternativeinspection procedures~ methods or equipment (including tool ‘inspection, statistical process control~ substitute samplingplans, etc.) may be used by the contractor when they provide,as a minimum the level of quality assurance required by theprovisions specified herein. Prior to applying such alternativeinspection procedures~ methods or equipment the contractorshall describe them in a written proposal submitted to theProcuring Contracting Officer for evaluation and approval by theGovernment. When required, the contractor shall demonstratethat the effectiveness of the proposed alternative(s) is equalto or better than the quality assurance provisions herein. Incases of dispute as to whether certain procedures of thecontractor’s proposed alternative(s) provide equal ass~rance~the provisions of this specification shall apply.

4.2 Classification of inspections. The following ‘types ofinspection shall be conducted on this item:

a. First article inspection

b. Quality conformance inspection

4.3 First article inspection.

4.3.1 Submission. The contractor shall submit a firstarticle sample as designated by the Contracting Officer forevaluation in accordance with the provisions of 4.3.2. Thefirst article sample shall consist of the itemsas required perTable 1.

4.3.2 Inspections to be performed. See MIL-A-48078 andTable I specified herein.


MIL-C-70781 (AR)

4.3.3 Rejection. See MIL-A-48078.

4.3.3.1 Ballistic test. The first article ballistic testshall be rejected if:

a. One or more misfires occur.

b. Two or more duds occur.

c. One or more short rounds occur.

d. One or more premature bursts occur.

e. One or more metal parts separations occur.

f* Horizontal range standard deviation is exceeded (70°Fconditioned samples only).

6


fflo

aTABLE

1.

~ection

CLASSIFICATIONOF

DE

FE

CT

S&

TE

ST

S

.,

E41L-C-70781(AR)

mm

Flw

Wu

xam

Cartridge,

AsseIRblyand

Container

Qmzwv

ExAUIXAmm*

T=

SA

UFLE

IWQ

UIR

CU

KW

iA8

AG

aA

~R

m=acw

WITS

J&b

PARAGRAP14

/lNsFWf@M

MEW*

Cartridge,

Prior

to

Insertinq

Burster

Examination

forDefects

25

3.1.2

4.4.2.1

(Dwg,15-12-345)

Examination

forDefects

25

3.2

4.4.2.2

Cartridge,

Prior

tO

Ass@mblY

of

Examination

fOrDefects

25

3.2

4,4.2.4

Examination

forDefects

25

3.1.213.2

4.4.2.5

Ballistic

Test

(ProvingGround)

144

3.3

4.5.3

Metal

Ammunition

Container

(Dw

g.15-12-358)

Examination

of

Defects

55.1

4s4.2.8/4.4.2.9

Air

Leakage

Test

55.1

4.4.2.9

-.

------A.,-\F

,*.-.*

n..-n-l,,L:-l.-.s,--+hfi,defiA

AM

SM

CF

OP

ITI1

570,

1F

eb85


MIL-C-70781 (AR]

4.4 Quality conformance inspection.

4.4.1 Inspection lot formation. Inspection lots shallcomply with the lot formation provisions of MIL-A-48078. Inaddition, inspection lots of cartridges shall contain:

a. Body filling assemblies of one lot interfix from onemanufacturer.

b. Bursters of one lot interfix from one manufacturer.

c. Fin assemblies of one lot interfix from onemanufacturer.

d. Ignition cartridges of one lot interfix from onemanufacturer.

e. Propellant charges of one lot interfix from onemanufacturer.

f. Obturating rings of one lot interfix from ‘onemanufacture r.

9* Fuzes o-fone lot interfix from one manufacturer.

4.4.2 Examination. See MIL-A-48078. Unless otherwisespecified in the Classification of Defects and Test Tables,sampling plans and procedures for major and minor defects shallbe in accordance with MIL-STD-105, Inspection Level II.

I


..

w

*●

QUALITY

CONFORP@iNCEINSPECTION

MIL-C-70781

(AR)

—--

wlA

asA

FH

---inn”

‘“

4,4.2.1

BMWI*WuMDsn

Cartridge,

Prior

to

Inserting

i3urster

11

15-12-345

SECT

wMcrfnwMm~u.iv

a?u%xw

NO

.O

FA

QL

cxw

um

wen

-sA

MP

LE

SEOI

JIRE

UWT

PARAGRAPH

RC

fE@

EN

CC

UMITS

d%b

PAgAGRAPH

/l&sFKnou

@!moo

-

Critical

113ursterpad

missing

100%

3.1.2

Gage

!&k@

101

Foreign

matter

inburster

well

0.40%

3.1.2

Visual

Minor

201

Poor

workmanship

0.65%

3*5

Visual

NIS

MC

Form

1570

,1

Feb

85R

epla

ces

!3R

SM

C-Q

A(D

)F

orm

160,

1A

ug83

,w

hicl

~m

ayno

tbe

use

d.


IJ

o

QUALITY

CONFORMANCE

INSPECTION

CLASSIFICATIONOFDEFECTS&

TE

ST

SMIL-C-70781

(AR)

~pARAGMPN

DMWIOM

MUMDCR

4.4.2.2

Cartridge,

Prior

toAssembling

Fuze

11

1.5-12-345

WE?x

wH=

HICHEh~U

BL

Y

NO

.O

FA

QL

cA?e

GoR

YEX

AM

INA

TIO

No

nTm

SAM

PLE

OR

REO

UIR

EUEN

TPA

RAG

RAPH

REFE

REN

CE

UNIT

S10

0%PA

RAG

RAPH

/lMsPccrlMMCWOO

Critical

None

defined

Major

101

Burster

missing

0.40%

3.1.2

Visual

102

Foreign

matter

inburster

well

0.40%

3.1.2

Visual

Minor

20’1

Poor

workmanship

0.65%

3.5

Visual

.

AMSMC

For

m15

70,

1Fe

b85

Rep

lac

es

DRS

FIC

-QA

(D)

Form

60,

1A

ug83

,w

hic

hm

ay

not

beused.

●.

.


,*

j)UllI@TYCONFORMANCE

INSPECTION

CL

AS

SIP

ICA

710N

OF

DE

FE

C~

&T

ES

TS

MIL-C-70781

(AR)

4.4.2.3

Charge,

Propelling

11

9312698

ate

w— ‘H-Wend

~U

8LT

-

15+12-345

Ho.or

At2

LC

!AT

EG

QW

,xA

Ult

tmm

lw

Tu

’rSAMPL~

on

aEOUl@EUEWTPARAGAtAPIB--lWE19E)ICC

UNlrs

*-

?ARAGRA?M

/lWPKYlo#

urml@o

-—

w

Critical

1Container

oi

container

seal

damaged

to

the

extent

thatpropellant

shall

(a)

100%

3.1.2

Visual/Gage

escape

(see4.5.4)

Major

101

Container

or

container

seal

damaged

but

not

to

the

extent

that

propellant

(a)

100%

3.1.2

Visual/Gage

shall

escape

(see

4.5.4)

102

Gross

weight

of

propelling

charge,

min.

(a)

100%

3,1.2

Gage

Minor

None

defined

—(a)

If

LAP

of

the

propelling

charge

and

cartridge

are

performed

at

the

same

installation,

this

inspection

isnot

required.

Rep

lace

sR

RS

MC

-QA

(D)

For

m16

0,1

Aug

$3,

whi

chm

ayno

tbe

used

.


QUALITY

CONFORMANCE

INSPECTION

CL

AS

SIF

ICA

TIO

NO

FD

EF

EC

fi&

‘TM

’SMIL-C-70781

(AR)

DR

AW

ING

MU

MBC

R

4.4.2.4

11

15-12-345

Cartridge

and

Propelling

Charge

NUTH1614~~UBLY

eATcGoRY

NO.OF

AOL

cxAMlmArlom

ORTm

SA

MP

LE

on

RE

QU

IRE

ME

NT

PA

RA

GR

AP

HR

EF

ER

EN

CE

UN

ITS

1*

PARAGRAPH

/lNS?fCl!ONU~OO

Critical

1Obturating

ring

missing

100%

3.2

Gage

(note

a)

2Burster

loose

100%

3.1.3

Manual

Special

aFin

blade

distorted

100%

3.2

Gage

!!%@

101

Obturating

band

damaged

0.40%

3.2

Visual

102

Fin

assembly

torque

0.40%

3.2

Test

103

Fuze

torque

0.40%

3.2

Test

104

Fin

assembly

not

fully

seated

0.40%

3.2

Visual

105

Fuze

not

fully

seated

0.40%

3.2

Visual

106

Obturating

ring

not

flush

or

below

bourrelet

diameter

100%

3.2

Gage

(notea)

107

Cartridge

assembly

fails

to

fully

enter

profile

and

alignment

gage

100%

3.2

725634817256281/

7257962

Minor

201

Pettman

cement

application

improper

0.65%

3.2

Visual

202

Poor

workmanship

0.65%

3.5

Visual

~The

inspection

for

defects

can

be

performed

at

astation

prior

to

this

station

when

deemed

necessary.

~--1.--.

mmrMe

nA

ln\

r---

lcn

1n

,.-

02

,.,

h;e

l._L

L-

AM

SM

CF

orm

1570

,1

Feb

85

●

KE

’~ld

CeS

UK

>lT

b-~

H{U

)rU

l”lll

IUU

>I

MU

YV

49

WII

ILII

mayno~Deuses.

●


@

QUALITY

CONFORMANCE

INSPECTION

CL

AS

SIW

AT

19M

OF

DE

FE

CT

’S&

TE

ST

S141L-C-70781(AR)

WIAmAm

~D

MW

IWWnoca

4.4.2.5

Cartridge

1W2

15-12-345

mccr

-nKxYulGMmuswlLT

—

Ho.OF

AQL

eA

TW

ea

Ym

lmA

Ylo

$l

mw

SA

MP

LE

~H

3UlR

EM

EW

T?ASAGSJA?HREFERENCE

UNITS

1%

PARAGRAPH

/lN%FCCflO#HEW@

—..

-Critical

1Minimum

distance

from

topof

ignition

cartridge

assembly

to

edge

of

fin

incorrect

100%

3.2

Gage

2Propellant

charge

missing

or

damaged

to

the

extent

that

propellant

100%

3.2

Visual/Gage

shall

escape

(see4.5.4)

Special

aStencil

warning

notice

missing

or

illegible

10CI%

.3.2

Visual

w 101

Ignition

cartridge

torque

0.40%

3.2

Test

102

Propellant

charge

damaged

but

not

to

the

extent

that

propellant

shall

escape

100%

3.2

Visual/Gage

(see4.5.4)

AM

SM

CF

orm

1570

,1Feb/35

Rep

lace

sD

R.94

C-Q

A(D

)Fo

rm16

0,1

Aug

83,

w~i

ch

ma

yno

tb

eused.


QUALITY

CONFORMANCE

INSPECTION

MIL-c-70781

(AR)

CL

AS

SIF

ICA

TIO

NO

FD

EF

EC

TS

UIT

ES

?’S

4

PA

RA

6UW

m=

DR

AW

IWNUMBER

$.4.2.5

Cartridge

(continued)

22

WErr

w15-12-345

Mm

M16M~~

UB

LT

aT

cG

oR

Y

NO

.O

FA

OL

EXA

MIN

ATI

ON

OR

TES?

SAM

PLE

OR

REO

LJIR

EMEM

TPA

RAG

RAPH

RE

FE

RE

NC

EUN

ITS

1-PA

RAG

RAPH

/lN

SPKl

lON

M~O

O

4inor

201

Paint

damage

area’in

excess

of

1,/4square

inch

0.65%

3.2

Visual

202

Marking

incorrect

or

illegible

0.65%

3.2

Visual

203

Pettman

cement

application

improper

0.65%

3.2

Visual

204

Poor

workmanship

0.65%

3.5

Visual

Proving

Ground

Test

Production

Ballistic

Acceptance

111/9(1

3.3

4.4.3.l/4.5.3

,—.—

.--

..

--

,.

A14

SMC

Form

1570

,1Feb85

Rep

lace

sD

RS

MC

-QA

(D)

For

mIW

,I

nug

HS

,w

nlc

llm

ay

not

be

use

d.


QUALITY

CCX’U?C)RMANCE3NSPECTION

P LJl

t

CL

AS

SIF

ICA

TIO

NO

F!X

FE

CT

S&

TE

ST

SP41L-c-70781(AR)

~ 4.4.2.6

Fiber

Container

(Unsealed)

1*1

15-12-352

sncm

am

nlGwm-MDLY

15-12-358

No.or

*YCWY

AQ

LEx

Aul

MA

rloa

Oa

mSA

MPL

EBE

aul

uEM

EsT

PA4AGRA?UIWWKHCC

Unlrs

l%b

PA@AGRAPH

/lNsPccYlo$lIamoo

——

Critical

None

defined

Special

aPropelling

charge

support

assembly

missing

100%

5.1

bVisual

Support

assembly

position

improper

100%

5.1

Visual

Major

101

Tube

support

missing

0.40%

5.1

Visual

102

Cushion

missing

0.40%

5.1

103

Visual

Packing

stop

missing

0.40%

5*1

Visual

Minor

201

Round

cannot

be

removed

by

hand

0.65%

5.1

Visual

202

Glue

or

asphalt

on

round

0.65%

5*1

Visual

AM

SM

CF

orm

1570

,1

Feb

05Re

pla

ce

sIIR

9K-Q

A(0

)Fo

rm16

0,1

Aug

83,

w~~

clI

ma

yno

tb

eus

ed

.


QUALITY

CONFORMANCE

INSPECTION

CL

AS

SIF

ICA

TIO

NO

FD

EF

EC

TS

4T

ES

l%MIL-c-70781

(AR)

PA

MG

RA

PM

mu”

DRAWING NUMSSR

4.4.2.7

Fiber

Container

(Sealed)

11

15-12-352/15-12-359

wEn

wM=

HICllSh

~M

BL

Y

15-12-358

NO

.O

FA

QL

CA

TC

GO

RV

CX

AM

IMA

TIO

NO

RT

=S

AM

PL

EO

RR

EQ

UIR

EM

EN

TP

AR

AG

RA

PH

RE

FE

RE

NC

EU

NIT

SlGO%

PA

RA

GR

AP

H/l

NS

PC

CT

IOU

MC

WO

O

2.ritical

None

defined

Major

101

Container

damaged

or

cut

through

all

asphalt

impregnated

layers

0.40%

5.1

Visual

102

Sealing

strip

not

applied

properly

0.40%

5.1

Visual

103

Metal

end

loose

or

distorted

0.40%

5.1

Visual

Minor

201

Marking,

as

specified

on

Drawing

15-12-359

incorrect

or

illegible

0.65%

5.1

Visual

202

Contents

loose

0.65%

5.1

Visual

.

..—

..

Affi

MC

Form

1570

,1

Feb

85

a

Rep

lac

es

DRS

HC

-QA

(D)

Form

160,

1A

ug83

,w

hic

hm

ay

not

beused.

●


.

I

1

I

IJ

a)

do M

Cna,u

17


i- Cr

PASMMW

4.4.2.9

cATE

eoaY

Critical

Major

101

Minor

201

202

\MS

MC

For

m

QUALITY

CONFORMANCE

INsPECTION

CL

AS

SIF

ICA

TIO

NO

FD

EF

EC

TS

&T

ES

TS

wetalAmmunition

Container

(Sealed)

CxA

ulm

mo

ttw

Tm

None

defined

Air

leakage

Marking

;ontents

test

incorrect

loose

or

illegible

1570

NO.OF

SAM

PLE

UNIT

S

AO

LO

R10

0%

LOO%

0.65%

).65%

DR

SM

C-Q

A(D

)

REQ

UIR

EMEN

TPA

RAG

RAPH

5.2

5.4.2

5.2

MIL-C-70781

(AR)

DRAWINGWMBCS

15-12-358

NUT

MIGHSh

ASS

MSL

Y

9293440

PA

RA

GR

AP

HR

EF

ER

EN

CE

/lNS

PC

~lO

UM

CW

OO

4.5.1

Visual

Manual

1Fe

b85

Rep

lac

es

For

m16

0,1

Aug

83,

whichmaynotbeused.


MIL-C-70781

(AR)

~ma&mA?’H

DU

WIM

?3M

IJM

SU

9.4.

2.10

Packing

Box

(Sealed)

11

9293440/15-12-361

swcn

w

-Hf3.OF

AW

W@

-Z

S.A

UIM

AW

OH

mm

SA

MP

LE

nE

WgciJ

EM

YP

AR

AG

NA

PH

RC

FC

ilE

NC

CU

NIT

Sll

%b

PAa

AG

nAW

#l#l

sPzc

YmM

blm

oo

Crit

ica

llk

me

defined

Major

None

defined

Minor

201

Boards

splitior

separated

exposing

containers

0.65%

5*3

Visual

202

Contents

loose

0.65%

5*3

Manual

203

Marking,

incorrect

or

illegible

0.65%

5.4

Visual

..

...

AI~

SM

CF

orm

1570

,1

Feb

85ReplacesK

KW

IC=

QA

(D)

For

m16

0,1

Aug

83,

whl

cl~

maY

not

beus

ed.


MIL-C-70781 (AR)

4.4.3 Testinq.

4.4.3.1 Proving ground test (see 3.3). The cartridgesshall be observed for the following characteristics:

a. Misfires, Major defect (see 3.3.1)

b. Duds, Major defect (see 3.3.3)

c. Short rounds, Critical defect (see 3.3.6)

d. Premature burst, Critical defect (see 3.3.2)

e. Metal parts separation, Critical defect (see 3.3.4)

f. Range precision, Major defect (see 3.3.5) (70°Fconditioned samples only) .

Testing shall be as specified in 4.5.3.

4.4.3.1.1 Initial production test. Beginning with thefirst lot produced and continuing until three consecutive lotshave complied with the acceptance criteria specified herein? 111random sample cartridges shall be selected from each lot forthis test.- The lot shall be rejected if:

a.

b.

c.

d.

e.

f.charge 2 or

One or more misfires occur

Two or more duds occur

One or more short rounds occur

one or more premature bursts occur

One or more metal parts separations occur

Horizontal range standard deviation at charge 0,charge 4 is exceeded.

4.4.3.1.2 Production test. After three consecutive lotshave complied with the criteria of 4.4.3.1.1, 90 random samplecartridges shall be selected from each lot for this test. Thelot shall be rejected if:

20


‘@I

MIL-C-70781 (Al?)

a. One or more misfires occur

b. Two or more duds occur

C* One or more short rounds occur

d. One or more premature bursts occur

e. One or more metal parts separations occur

f. Horizontal range standard deviation at charge O orcharge 4 is exceeded.

4.4.4 Inspection equipment. The inspection equipmentrequired to perform the examination and test prescribed hereinis described in the “Paragraph Reference/Inspection Method”column is the tables starting with 4.4.2.1. The contractorshall submit for approval inspection equipment designs inaccordance with the terms of the contract. See section 6 ofMIL-A-48078.

4.5 Methods of inspection.1

4.5.1 Container air leakaqe test. The shipping and storagecontainers shall be tested in accordance with Drawing 9246386.

4.5.2 Burster. Gently shake the cartridge in line with thelongitudinal axis. Rattles indicate a IOCH? burster.

4.5.3 Proving ground test. The test shall be performed ata Government Proving Ground in accordance with the applicableU.S. Army Test and Evaluation Command (USATECOM) Acceptance TestProcedure.

4.5.3.1 First article test. The cartridges for firstarticle testing shall be separated into three equal groups; onegroup conditioned for 24 hours at + 145°F ~ 2.5°F, one groupconditioned for 24 hours at + 700F ~ 2.5°F and one groupconditioned for 24 hours at -50°F ~ 2.5°F. Each group shallbe separated into three equal subgroups; one subgroup tested atcharge zero~ one subgroup tested at charge two~ and one subgrouptested at charge four.

4.5.3.2 Production test. l%e cartridges for production lotacceptance shall be conditioned at 70°F + 2.5°F. The samplefor the first three production lots {111~ shall be separatedinto khree equal groups; one group tested at charge zeror onegroup tested at charge two, and one group tested at charge four.

21


MIL-C-70781 (AR)

After three consecutive lots have complied with the acceptancerequirements ? the production lot samp~.e (90) shall be separatedinto two groups; one group tested at charge zero~ and one grouptested at charge four. All cartridges from the ballistic sampleshall be radiographer prior to shipment to the ballistic testfacility. Film from acceptable lots may be discarded. Thecartridge shall be fired from a standard 60MM LightweightCompany Mortar System (LWCMS) mortar at an elevation of 45°from a hard mount (a solid base test fixture) within two minutesafter removal from the conditioning chamber. The individualvelocities pressures deflections, and ranges shall be recordedon the firing record. Observation shall be made for misfiresand duds~ and shall be recorded. Should a premature burst ormetal parts separation occur? a photograph shall be taken of theevidence and attached to the firing record. The velocity andrange standard deviations and arithmetic averages shall becalculated and recorded. Range probable error shall becalculated and recorded. Temperature of the day~ weather andthe time of firing shall also be recorded. Hawk radar shall beused to observe for metal parts separation~ unobserved shortrounds and unobserved duds. In these events, an analysis shouldbe made of the radar data and should be noted on the firingrecord. This shall include a comparison of times of flight ofthe unobserved rounds with that of the normal rounds. Prints ofthe radar traces of these rounds, and prints of the precedingand succeeding rounds, shall be attached to the firing record.Data from ballistically acceptable lots may be discarded. Asmear camera shall be used to photograph all test samples. Thecamera shall be positioned to pick up each round just outsidethe second velocity coil. Should an unobserved dud, short roundor any other adnormal performance occurf a photo print of theserounds, and prints of all the other rounds in the particularcharge zonel shall be attached to the firing record. Film fromacceptable lots may be discarded.

4.5.3.3 Test validity. If for any reason the proving1 considers that the test conditions haveground personne.

detrimentally affected the test results, the test results shallbe declared invalid and a new test shall be performed onadditional sample cartridges.

4.5.4. Damaged propelling charge. To ascertain, that adamaged propelling charge is to be classed as critical or major,the following procedure shall be used:

22


I

MIL-C-70781 (m)

a. Place the damaged charge on a k127 fin,,oriented suchthat the propellant would be resting against the damagedsurface.

b. The fin-charge shall be hand-shaken vigorously threetimes.

c* Examination shall be made for propellant spillage - ifany propellant is observed, the damaged propelling charge shallbe classed as a critical defect; if no p~opellant is observed~the damaged propelling charge shall be classed as a majordefeet,.

4.!5.5. Radiographic examination. The ballistic samplecartridges (WP filled) shall be subjected to radiographicexamination. The radiographic beam shall form a 900 anglewith the longitudinal axis of the projectile. Examination ofthe radiograph shall be made to determine the presence of theburster pad in the burster casing, part missing or improperlyassembled, as well as cracksl foreign material or similardefects. Radiographic equipment, operations and proceduresshall be qualified in accordance with MIL-STD-453. In addition,the sensitivity of the radiographic technique shall be 2.0percent, and the photographic density of the film used shall beno less than 1.25, as determined in accordance with 4.5.5.2. Inthe event an original radiograph leaves doubt as to itsacceptability, the cartridge shall be re-radiographer at anangle 90° from that of the original exposure and in the sameplane.

4.5.5.1 Sensitivity check of radiographic technique. Thesensitivity of the radiographic technique shall be determined bythe means of a penetrameter fabricated as specified herein.Location of the penetrameter hole shall be 4 1/4 inches measuredfrom base shoulder of projectile body toward fuze nose threads.The projectile, with attached penetrameter! shall be positionedbetween the radiographic source and the radiographic film withthe penetrameter facing the radiographic source. Whenradiographing a group of projectiles on a rotating ring~ thepenetrameter, taped to a projectile, may be used to representthe group when checking sensitivity. The sensitivity of theradiographic kecbnique shall be considered satisfactory when theimage of the penetrameterr including the holes~ is sharplydefined on the radiograph. The penetrameters shall be made ofsteel having an approximate specific gravity of 7.8.Fenetrameter thickness shall be .020 plus or minus (~) .010inches. Each penetrameter shall have a circular hole with adiameter twice that of the penetrameter thickness. For furtherdetails on construction of the penetrameters, see MIL-STD-453.Frequency of sensitivity check shall be no less than one in eachfifty (50) radiographs.

23


MIL-C-70781 (AR)

4.5.5.2 Check of photographic density of film. Thephotographic density of the film shall be determined on the filmin the region of the maximum equivalent thickness to beradiographed. Film density shall be checked each hour ofoperation, or fraction thereof, for each film processor.Greater frequency shall be required for any period during whichdifficulty is encountered in establishing the requireddensities. To judge densities, it is recommended that standardsbe used. Comparison of the film with standards may be madevisually; however, the use of a densitometer is recommended.

4.5.5.3 Personnel qualification and certification.Personnel performing the radiographic examination in accordancewith paragraph 4.5.5 shall meet the qualification andcertification requirements defined in MIL-STD-410 as follows:

4.5.5.3.1 Set up and calibration. Level II.

4.5.5.3.2 Operator. Level I.

4.5.5.3.3 Documentation. The contractor will prepare andsubmit for approval, in accordance with data item descriptionDI-S-3628 and the DD Form 1423, his detailed procedures forqualification and certification of personnel performing thenon-destructive testing procedures required herein.

5. PACKAGING

5.1 Unit packaginq.

5.1.1 Level A. The filled and cleaned cartridge shall bepreserved in accordance with (Dwg.) 15-12-352. Eight eachcartridges shall be packed together in a container in accordancewith (Dwg.) 15-12-358. The container shall have a maximum airleakage rate of .40 atmospheric cubic centimeters per secondwhen 3.0 pounds per square inch gage (psig) minimum externalvacuum is applied when tested as specified in 4.5.1. Cartridgesshall be oriented in a fuze end up configuration.

5.1.2 Level B. Same as level A.

5.1.3 Level C. Same as level A.

24


MIL-C-70781 (AR)

I

I

b

I,T

5.2 Packin~.

5.2.1 Level A. Two each metal ammunition containershaving eight M722 cartridges per container shall be packedtoaether in a fuze end up configuration in accordance with thepa;king requirements9293440.

5.2.2. Level B.

5.2.3 Level C.

5.3 Marking.

for-the M720 cartridge shown on (Dwg.)

Same as level A.

Same as level A.

5.3.1 Level A. The spirally wound, fiber ammunitioncontainer shall be marked in accordance with (Dwg.) 15-12-359.Each metal ammunition container shall be marked in accordancewith (~WCJ.) 15-12-358. Each wood shipping container shall bemarked in accordance with [Dwg.) 15-12-361.

5.3.2 Level B. Same as level A.

5.3.3 Level C. Same as level A.

6. NOTES

6.1mortars.

6.2.

6.3.

Intended use. This item is intended for use with 60mm

Ordering data. See MIL-A-48078.

Submission of test data. One copy of proving groundballistic acceptance test data (i.e., firing record) shall beforwarded to each of the following:

CommanderU.S. Army Armament Research, Development and

Engineering CenterATTN : AMSMC-QAT-B (D), Bldg #62Picatinny Arsenal, NJ 07806-5000

6.4 Submission of inspection equipment designs forapproval. See para 6.2.3 of MIL-A-48078. Submit designs asrequired to:

Commander, U.S. Army Armament, Munitions andChemical Command

ATTN : AMSMC-QAT-1 (D), Bldg. #62Picatinny Arsenal, NJ 07806-5000

This address will be specified on the Contract Data RequirementsListr DD Form 1423 in the contract. Unless otherwise specified,data item DI-R 1714 will apply.

25


MIL-c-70781 (AR)

6.5 Drawings. Drawings listed in Section 2 of thisspecification under the headings U.S. Army Armament Research~Development and Engineering Center (ARDEC) may also includedrawings prepared by, and identified as Edgewood Arsenal,Frankford Arsenal, Rock Island Arsenal, Picatinny Arsenal orARRADCOM drawings. Technical data originally prepared by theseactivities is now under the cognizance of ARDEC.

6.6 Subject term (key word) listinq.

BursterWhite phosphorous (WP)

Custodian:Army-AR

Preparing activity:Army-AR

(Project 131O-A451)

26 *14SG0WRPJMENT r3uNmhwomcE: 19u9-604-033/IIw8


llmlS&i 1425 W’4iEV10L13 GO$TIOtd W O#SOLHIL

. .

.,


Documents

MIL-C-707BI (AR) 17 October 1988 MILITARY …everyspec.com/MIL-SPECS/MIL-SPECS-MIL-C/download... · specifications and standards form a part of this specification ... functioning