DTL9352621A.pdf

DTL9352621A

w/AMENDMENT 1

CAGE CODE: 19200

18 June 2012

SUPERSEDING

DTL9352621A

CAGE CODE: 19200

8 May 2006

DETAIL SPECIFICATION

ITEM SPECIFICATION

FOR THE

CARTRIDGES, 81MM, ILLUMINATING, M853A1

AND INFRARED ILLUMINATING, M816

LOADING, ASSEMBLING, AND PACKING AND PARTS FOR

U.S. Army ARDEC Picatinny Arsenal, NJ 07806-5000

Prepared by

ARDEC

Quality Engineering & System Assurance

RDAR-QEM-C

This specification has been verified to comply with the criteria of MIL-DTL-961E and applicable Army guidance by the ARDEC Standardization office. The technical content has been reviewed by QESA Detail Spec Review Panel.

FSC 1315

DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.

This cover page must be part of the solicitation copy.

INCH-POUND

1. SCOPE

1.1 Scope. This specification covers the requirements of the loading, assembling and packing and parts for two types of illuminating cartridges for the M252 Improved 81MM Mortar System.

1.2 Classification. The illuminating cartridges are as follows:

1.2.1 Cartridge, 81mm: Illuminating, M853A1. The cartridge is hereafter referred to as the M853A1.

1.2.2 Cartridge, 81mm: Infrared, Illuminating, M816. The cartridge is hereafter referred to as the M816.

2. APPLICABLE DOCUMENTS.

2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all requirements cited in sections 3 and 4 of this specification, whether or not they are listed.

2.2 Government documents.

2.2.1 Specifications, standards and handbooks. The following specifications, standards and handbooks of the form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the solicitation or contract.

DEPARTMENT OF DEFENSE STANDARDS

MIL-STD-1168 Ammunition Lot Numbering and Ammunition Data Card

MIL-STD-1916 DOD Preferred Methods for Acceptance of Product

(Copies of these documents are available online at https://assist.daps.dla.mil/quicksearch or from the Standardization Documents Order Desk, 700 Robbins Avenue, Bldg. 4D, Philadelphia, PA 19111-5094.)

2.2.2 Other Government documents, drawings and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation.

https://assist.daps.dla.mil/quicksearch/�

U.S. ARMY ARMAMENT RESEARCH, DEVELOPMENT AND ENGINEERING CENTER

(ARDEC) DRAWINGS

9209555-8 Sleeve 9352621 Cartridge, 81MM: Illuminating, M853A1, w/Fuze MTSQ, M772 9381075 Parachute Folding and Packing Assembly 9381088 Pin 9381093 Projectile, 81MM: Illuminating, M853A1 Loading Assembly 12953389 Cartridge, 81MM: Infrared Illuminating, M816, w/Fuze MTSQ, M772 12953388 Projectile, 81MM: Infrared Illuminating, M816 Loading Assembly 9276600 Filler, Disc Assembly 9300226 Pin, Shear 9369955 Cup, Parachute 9369956 Plate, Drogue 9369957 Disc, Separator 9369958 Liner, Parachute 9369959 Sleeve, Split 9381073 Wire, Suspension 9381074 Spacer, Felt 12630558 Disc, Parachute 12630653 Wire, Suspension Ring 12961110 Strip, Identifying 12993640-1 Cushion 12993640-2 Filler 13010950 Polyester Sleeve 12993640 Packing and Marking for Container, Ammunition, Fiber PA162 for

Cartridge, 81mm: M816 12944509 Packing and Marking for Container, Ammunition, PA156 & PA157 for

Cartridge, 81MM: M819, M853A1 and M879 12993638 Packing and Marking for Container, Ammo, PA156 & PA157 for

Cartridge, 81MM: M821A1, M821A2, M816 & M889A1 13024001 Cartridge, 81MM: Illuminating, M853A1, w/Fuze MTSQ, M772 13024002 Cartridge, 81MM: Infrared Illuminating, M816, w/Fuze MTSQ, M772

(Copies of these drawings maybe requested online at pica.drawing.request@conus@.army.mil or from US Army ARDEC, ATTN: RDAR-EIS-PE, Picatinny Arsenal, NJ 07806-5000.)

2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation.

AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME)

ASME B46.1 Surface Texture

(Copies of ASME standards are available online from http://www.asme.org.)

AMERICAN SOCIETY FOR TESTING AND MATERIALS INTERNATIONAL (ASTM)

ASTM D644 Standard Test Method for Moisture Content of Paper and Paperboard by Oven Drying

ASTM D4444 Standard Test Method for Use and Calibration of Hand- Held Moisture Meters

(Copies of ASTM standards are available online from http://www.astm.org)

2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3. REQUIREMENTS

3.1 First article. When specified in the contract or Statement of Work (SOW), a sample shall be subjected to first article inspection in accordance with 4.3.

3.2 Materials. Materials, parts and assemblies shall comply with requirements specified on the applicable drawings and referenced specifications.

3.3 Components and assemblies. The components and assemblies shall conform to the applicable drawings and specifications.

3.3.1 Sleeve. The sleeve shall conform to drawing 9209555-8.

3.3.2 Pin, Shear. The shear pin shall conform to drawing 9300226.

3.3.3 Cup, Parachute. The parachute cup shall conform to drawing 9369955.

3.3.4 Plate, Drogue. The drogue plate shall conform to drawing 9369956.

3.3.5 Disc, Separator. The separator disc shall conform to drawing 9369957.

3.3.6 Liner, Parachute. The parachute liner shall conform to drawing 9369958.

3.3.7 Sleeve, Split. The split sleeve shall conform to drawing 9369959.

3.3.8 Wire, Suspension. The suspension wire shall conform to drawing 9381073.

http://www.astm.org/�

3.3.9 Spacer, Felt. The felt spacer shall conform to drawing 9381074.

3.3.10 Disc, Parachute. The parachute disc shall conform to drawing 12630558.

3.3.11 Wire, Suspension Ring. The suspension ring wire shall conform to drawing

12630653.

3.3.12 Strip, Identifying. The identifying strip shall conform to drawing 12961110.

3.3.13 Cushion. The cushion shall conform to drawing 12993640-1.

3.3.14 Filler. The filler shall conform to drawing 12993640-2.

3.3.15 Polyester Sleeve. The polyester sleeve shall conform to drawing 13010950.

3.3.16 Filler, Disc Assembly. The filler disc assembly shall conform to drawing 9276600.

3.3.17 Projectile, 81MM: Illuminating, M853A1 Loading Assembly. The Projectile, 81MM: Illuminating, M853A1 Loading Assembly shall conform to drawing 9381093.

3.3.18 Projectile, 81MM: Infrared Illuminating, M816 Loading Assembly. The Projectile, 81MM: Infrared Illuminating, M816 Loading Assembly shall conform to drawing 12953388.

3.3.19 Cartridge, 81MM: Illuminating, M853A1, w/Fuze MTSQ, M772. The Cartridge, 81MM: Illuminating, M853A1, w/Fuze MTSQ, M772 shall conform to drawing 9352621 or 13024001.

3.3.20 Cartridge, 81MM: Infrared Illuminating, M816, w/Fuze MTSQ, M772. The Cartridge, 81MM: Infrared Illuminating, M816, w/Fuze MTSQ, M772 shall conform to drawing 12953389 or 13024002.

3.4 Pull force for oval sleeve crimp to suspension wire and suspension wire ring. The oval sleeve crimp to the suspension wire and suspension wire ring shall withstand a pull force of 2,000 pounds minimum.

3.5 Body loading disassembly. Projectile loading assemblies shall be subjected to a pull apart test to verify proper assembly of internal components.

3.6 Pull force for obturating ring. The obturating ring shall withstand a pull force of 10 lbs, minimum, and shall break at a pull force of 40 lbs, maximum.

3.7 Marking, shipping and storage configuration.

3.7.1 Configuration. The packing and marking instructions for the M853A1 and M816 cartridges shall comply with the requirements of drawing numbers 12993640, 12944509 and 12993638.

3.7.2 Paper and wood material. All paper and wood material shall be thoroughly dry at the time of packing, 9% maximum moisture content is allowed, unless otherwise specified.

3.8 Proving ground.

3.8.1 Misfire. The cartridge shall not fail to fire from the weapon.

3.8.2 Fuze functioning. The fuze shall function and expel the payload from the cartridge.

3.8.3 Security of parts. There shall be no parts failure in the bore of the weapon or in flight prior to fuze functioning.

3.8.4 Short rounds. No cartridge shall have a horizontal range less than 80 percent of the average horizontal range when the mean is calculated without the short round.

3.8.5 Premature burst. The cartridge shall not function in the bore of the weapon or in the first 100 meters of flight.

3.8.6 Cartridge performance.

3.8.6.1 Cartridge functioning. The parachute shall deploy and suspend the illuminant assembly during its burn time (See 6.8).

3.8.6.2 Visible (VL) Illumination. The M853A1 cartridge shall provide effective illumination (see 4.4.3.5.4 & 6.8) for a minimum of 50 seconds.

3.8.6.3 Infrared (IR) Illumination. The M816 cartridge shall provide effective illumination

(see 6.8) for a minimum of 60 seconds.

3.8.6.4 Fuze function time. The fuze assembly, when tested at +70+2.5oF and +145

+2.5oF shall function and comply with the fuze function time in Table I:

TABLE I. Fuze function time

Round Type

Temp.

(0F)

Charge Fuze function time tolerance (seconds)

M853A1 70 1 +/-1.5 M853A1 70 4 +/-1.5 M853A1 145 1 +/-1.5 M853A1 145 4 +/-1.5

M816 70 2 +/-1.5 M816 70 4 +/-1.5 M816 145 2 +/-1.5 M816 145 4 +/-1.5

3.9 Workmanship.

3.9.1 Parts and assemblies. All parts and assemblies shall be fabricated and finished in a thorough manner. Parts and assemblies shall be free of burrs, chips, dirt, grease, rust corrosion and other foreign material that shall adversely affect fit or function. Coatings and protective finishes shall be uniform and shall provide complete coverage of designated surfaces. The cleaning method used shall not be injurious to any part nor shall the cleaning agent contaminate parts.

3.9.2 Painting and marking. The painting and marking shall be restored by the assembling facility on any components that have been marred or obliterated.

4. VERIFICATION

TABLE II - Requirements/verification cross reference.

METHOD OF VERIFICATION CLASSES OF VERIFICATION

1- Analysis 2- Demonstration (end item test) 3- Examination 4- Test

A - First Article

B - Conformance

Section 3 Requirements

Description Verification Method

Verification Class

Section 4

1 2 3 4 A B

3.1 First Article X X X X 4.3

3.2 Materials X X X 4.4/4.5.1

3.3.1 Sleeve X X X 4.4.2.1

3.3.2 Pin, Shear X X X 4.4.2.11

3.3.3 Cup, Parachute X X X 4.4.2.9

3.3.4 Plate, Drogue X X X 4.4.2.5

3.3.5 Disc, Separator X X X 4.4.2.6

3.3.6 Liner, Parachute X X X 4.4.2.7

3.3.7 Sleeve, Split X X X 4.4.2.8

3.3.8 Wire, Suspension

X

4.4.2.3

3.3.9 Spacer, Felt X X X 4.4.2.10

3.3.10 Disc, Parachute X X X 4.4.2.4

3.3.11 Wire, Suspension Ring

4.4.2.2

3.3.12 Strip, Identifying X X X 4.4.2.13

3.3.13 Cushion X X X 4.4.2.14

3.3.14 Filler X X X 4.4.2.15

3.3.15 Polyester Sleeve X X X 4.4.2.12

3.3.16 Filler, Disc

Assembly

4.4.2.16

TABLE II - Requirements/verification cross reference – Continued.

2- Demonstration (end item test)

Section 3 Requirements

Description Verification Method

Verification Class

Section 4

1 2 3 4 A B

3.3.17 Projectile,81MM, Illuminating, M853A1 Loading

4.4.2.17/4.4.2.18/4.4.2.19

3.3.18 Projectile,81MM, Infrared Illuminating, M816 Loading

4.4.2.17/4.4.2.18/4.4.2.19

3.3.19 Cartridge, 81MM:

Illuminating, M853A1

4.4.2.20/4.4.2.21

3.3.20 Cartridge, 81MM:

Infrared Illuminating, M816

4.4.2.20/4.4.2.21

3.4 Pull Force for

Oval Sleeve Crimp to Suspension Wire and Suspension Wire Ring

4.4.3.1/4.5.3

3.5 Body Loading

Disassembly

4.4.3.3/4.5.4

3.6 Pull Force for

obturating Ring

4.4.3.4/4.5.5

3.7 Marking, Shipping and Storage Configuration

4.5.7

3.7.1 Configuration X X X 4.5.7.1

3.7.2 Paper and Wood

Material

4.5.7.2

3.8 Proving Ground X X X X X 4.4.3.5/4.6

3.8.1 Misfire X X X X X 4.4.3.5/4.6

3.8.2 Fuze Functioning

4.4.3.5/4.6

3.8.3 Security of Parts X X X X X 4.4.3.5/4.6

TABLE II - Requirements/verification cross reference - Continued

2- Demonstration (end item test)

Section 3 Requirements

Description Verification Method

Verification Class

Section 4

1 2 3 4 A B

3.8.4 Short Rounds X X X X X 4.4.3.5/4.6

3.8.5 Premature Burst X X X X X 4.4.3.5/4.6

3.8.6 Cartridge

Performance

3.8.6.1 Cartridge

Functioning

3.8.6.2 Visible (VL)

Illumination

3.8.6.3 Infrared (IR)

Illumination

3.8.6.4 Fuze Function

Time

3.9 Workmanship X X X X 4.4.2.1-4.4.2.24

3.9.1 Parts and

Assemblies

4.4.2.1-4.4.2.24

3.9.2 Painting and

Marking

4.4.2.1-4.4.2.24

4. VERIFICATION

4.1 Classification of verification. The verification requirements specified herein are classified as follows:

a. First article inspection (see 4.3)

b. Conformance inspection (see 4.4)

4.2 Verification conditions. Unless otherwise specified all verifications shall be performed in accordance with the test conditions specified herein.

4.3 First article. When specified in the contract or Statement of Work, a sample shall be subjected to first article verification in accordance with Table III.

4.3.1 First article quantity. First article inspection shall be performed on the quantities listed in Table III.

4.3.2 Verification to be performed. The first article inspection shall be performed in accordance with Table III.

4.3.3 First article rejection. If any item of the sample fails to comply with the first article requirements, the sample shall be rejected.

TABLE III - First article inspection

Paragraph

Title:

Parts and Assemblies for Illuminating M853A1(VL) and M816 (IR) Cartridges

Sheet 1 OF 3

Drawing Number See below

Classification

Examination or Test

Conformance

Criteria

Requirement

Next Higher

Inspection Method

Sleeve (Nicopress Oval Type) (dwg. 9209555-8) Examination for defects

Wire, Suspension Ring (dwg. 12630653) Examination for defects

Wire, Suspension (dwg. 9381073) Examination for defects

Disc, Parachute (dwg. 12630558) Examination for defects

Plate, Drogue (dwg. 9369956) Examination for defects

Disc, Separator (dwg. 9369957) Examination for defects

Liner, Parachute (dwg. 9369958) Examination for defects

Sleeve, Split (dwg. 9369959) Examination for defects

Cup, Parachute (dwg. 9369955) Examination for defects

Spacer, Felt (dwg. 9381074) Examination for defects

3.3.1

3.3.11

3.3.8

3.3.10

3.3.4

3.3.5

3.3.6

3.3.7

3.3.3

3.3.9

4.4.2.1

4.4.2.4

4.4.2.5

4.4.2.6

4.4.2.7

4.4.2.8

4.4.2.9

4.4.2.10

TABLE III - First article inspection - Continued

Parts and Assemblies for Illuminating M853A1(VL) and M816 (IR) Cartridges

Sheet 2 OF 3

Pin, Shear (dwg. 9300226) Examination for defects

Polyester Sleeve (dwg. 13010950) Examination for defects

Strip, Identifying (dwg. 12961110) Examination for defects

Cushion (dwg. 12993640-1) Examination for defects

Filler (dwg, 12993640-2) Examination for defects

Filler, Disc Assembly (dwg. 9276600) Examination for defects

Projectile, 81MM: Illuminating, M853A1/M816 Loading Assembly (During Assembly Operation, Prior to Body Loading).

(dwg. 9381093/12953388) Examination for defects

Projectile, 81MM Illuminating, M853A1/M816 Loading Assembly (During Body Loading).

(dwg. 9381093/12953388) Examination for defects

Projectile, 81MM: Illuminating, M853A1/M816 Loading Assembly (During Body Loading including Tail Cone Assembly).).

(dwg. 9381093/12953388)

3.3.2

3.3.15

3.3.12

3.3.13

3.3.14

3.3.16

3.3.17/3.3.18

4.4.2.11

4.4.2.12

4.4.2.13

4.4.2.14

4.4.2.15

4.4.2.17

4.4.2.18

4.4.2.19

TABLE III - First article inspection - Continued

Parts and Assemblies for Illuminating M853A1 (VL) and M816 (IR)Cartridges

Sheet 3 OF 3

Cartridge, 81MM: Illuminating, M853A1/M816, w/Fuze MTSQ, M772 (Prior to Assembly of Fuze, Fin Assembly & Ignition Cartridge).

(dwg. 9352621/13024001/12953389/13024002) Examination for defects

Cartridge, 81MM: Illuminating, M853A/M816, w/Fuze MTSQ, M772 (dwg. 9352621/13024001/12953389/13024002) Examination for defects

Ballistic test

Packing and Marking for Container, Ammunition, Fiber PA162 for Cartridge, 81MM; M816

(dwg. 12993640) Examination for defects

Packing and Marking for Container, Ammo, PA156 & PA157 for Cartridge, 81MM (unsealed) (dwg. 12944509/12993638) Examination for defects

Packing and Marking for Container, Ammo, PA156 & PA157 for Cartridge, 81MM (sealed) (dwg. 12944509/12993638)

120/6 1/

3.3.19/3.3.20

3.8

3.7

4.4.2.20

4.4.2.21

4.4.2.22

4.4.2.23

4.4.2.24

Notes: 1/ 120 rounds shall be ballistic tested for first article lot. Six (6) additional rounds shall be selected and used as test support rounds.

4.4 Conformance inspection.

4.4.1 Lot formation. Lot formation shall be in accordance with the lot formation requirements of MIL-STD-1916, paragraph “Acceptance by tables.” Lot numbering shall be in accordance with MIL-STD-1168. In addition, each inspection lot of cartridges shall contain:

a. Projectile body metal parts of one lot interfix number from one manufacturer.

b. Ignition cartridges of one lot interfix number from one manufacturer.

c. Fin assemblies of one lot interfix number from one manufacturer.

d. Propelling charges of one lot interfix number from one manufacturer.

e. Loaded fuzes of one lot interfix number from one manufacturer.

f. Parachute of one lot interfix number from one manufacturer.

g. Canister loading assemblies of one lot interfix number from one manufacturer.

h. Obturating rings of one lot interfix number from one manufacturer.

4.4.2 Examinations and tests.

a. For the conformance inspection paragraphs (4.4.2.1 to 4.4.2.24), the definitions of critical, major and minor defects are provided in paragraph “Definitions” of MIL-STD- 1916 (also see 6.8.e for critical classification rationale).

b. Conformance examinations and tests are specified in 4.4.2.1 to 4.4.2.24.

The conformance inspection paragraphs (4.4.2.1 to 4.4.2.16) shall be successfully performed for each part by the manufacturer and made available to the end producer prior to the LAP operation.

c. The acceptance criteria for sampling inspection shall be in accordance with the levels provided in the conformance examination/test paragraph and MIL-STD-1916 (See 6.10).

Conformance inspection by classification of characteristics

4.4.2.1

TITLE

Sleeve (Nicopress Oval Type)

Sheet 1 OF 1

9209555-8

Next higher 9381093/12953388

Critical None defined

Major 101 Length of sleeve VL-IV 3.3.1 Gage 102 Width of sleeve VL-IV 3.3.1 Gage 103 Thickness of sleeve VL-IV 3.3.1 Gage 104 Mechanical properties 2/ 3.2 1/ 6.2.e 105 Material verification 3.2 6.2.e

Minor

201 Evidence of poor workmanship VL-II 3.9 Visual

Notes: 1/ Minimum holding strength is 2,300 lbs.

2/ See 4.5.1

Wire, Suspension Ring

12630653

Next higher

101 Diameter of wire VL-IV 3.3.11 Gage 102 Length of wire VL-IV 3.3.11 Gage 103 Ends of suspension wire frayed or not fused VL-IV 3.3.11 Visual

105 Material verification 2/ 3.2 6.2.e

Notes: 1/ Suspension wire ring shall withstand a minimum breaking strength of 2,000 lbs.

Wire, Suspension

9381073

Next higher 9381075

101 Diameter of wire VL-IV 3.3.8 Gage 102 Length of wire VL-IV 3.3.8 Gage 103 Ends of suspension wire frayed or not fused VL-IV 3.3.8 Visual

105 Material verification 2/ 3.2 6.2.e

Notes: 1/ Suspension wire ring shall withstand a minimum breaking strength of 2,000 lbs.

4.4.2.4

Disc, Parachute

12630558

Next higher

101 Thickness of disc VL-IV 3.3.10 Gage 102 Diameter of center hole VL-IV 3.3.10 Gage 103 Diameter of disc VL-IV 3.3.10 Gage 104 Material verification 1/ 3.2 6.2.e

Notes: 1/ See 4.5.1

4.4.2.5

Plate, Drogue

9369956

Next higher

101 Thickness of drogue plate VL-IV 3.3.4 Gage 102 Diameter of center hole VL-IV 3.3.4 Gage 103 Diameter of drogue plate VL-IV 3.3.4 Gage 104 Surface finish improper VL-IV 3.3.4 4.5.2 105 Material verification 1/ 3.2 6.2.e

4.4.2.6

Disc, Separator

9369957

Next higher

101 Thickness of disc VL-IV 3.3.5 Gage 102 Diameter of disc VL-IV 3.3.5 Gage 103 Diameter of center hole VL-IV 3.3.5 Gage 104 Radius of side notch VL-IV 3.3.5 Gage 105 Material verification 1/ 3.2 6.2e

4.4.2.7

Liner, Parachute

9369958

Next higher

101 Width of liner VL-IV 3.3.6 Gage 102 Length of liner VL-IV 3.3.6 Gage 103 Material verification 1/ 3.2 6.2e

4.4.2.8

Sleeve, Split

9369959

Next higher

101 Outer radius of sleeve VL-IV 3.3.7 Gage 102 Thickness of sleeve VL-IV 3.3.7 Gage 103 Circumference of sleeve VL-IV 3.3.7 Gage 104 Length of sleeve VL-IV 3.3.7 Gage 105 Perpendicularity of ends VL-IV 3.3.7 Gage 106 Surface finish improper VL-IV 3.3.7 4.5.2 107 Material verification 1/ 3.2 6.2.e

Notes : 1/ See 4.5.1

4.4.2.9

Cup, Parachute

9369955

Next higher

101 Thickness of cup VL-IV 3.3.3 Gage 102 Width of cup VL-IV 3.3.3 Gage 103 Radius of inner slot VL-IV 3.3.3 Gage 104 Distance from the center of the inner slot to the outer edge

VL-IV

3.3.3

Gage 105 Diameter of cup VL-IV 3.3.3 Gage 106 Material verification 1/ 3.2 6.2.e

4.4.2.10

Spacer, Felt

9381074

Next higher

101 Thickness of spacer VL-IV 3.3.9 Gage 102 Diameter of inside hole VL-IV 3.3.9 Gage 103 Diameter of spacer VL-IV 3.3.9 Gage

4.4.2.11

Pin, Shear

9300226

Next higher

101 Diameter of pin VL-IV 3.3.2 Gage 102 Length of pin VL-IV 3.3.2 Gage 103 Material verification 1/ 3.2 6.2.e

4.4.2.12

Polyester Sleeve

13010950

Next higher

101 Improper length VL-IV 3.3.15 Gage 102 Edges frayed or not cleanly cut VL-IV 3.3.15 Visual 103 Sleeve is torn or unraveling VL-IV 3.3.15 Visual

4.4.2.13

Strip, Identifying (M816 only)

Drawing Number

12961110

Conforman ce

Requirem ent Paragraph

Next higher 12953389/ 13024002 Inspection Method

101 Length VL-IV 3.3.12 Gage 102 Width VL-IV 3.3.12 Gage 103 Color VL-IV 3.3.12 Visual 104 Zigzag cutouts missing or improper VL-IV 3.3.12 Visual 105 Material verification 1/ 3.2 6.2.e

4.4.2.14

Cushion

12993640-1

Next higher 12993640

101 Material verification 1/ 3.2 6.2.e

4.4.2.15

Filler

12993640-2

Next higher

101 Moisture content of packing material VL-IV 3.7.2 4.5.7.2 102 Material verification 1/ 3.2 6.2.e

Filler, Disc Assembly

9276600

Next higher

101 Diameter of larger disc VL-IV 3.3.16 Gage 102 Thickness of larger disc VL-IV 3.3.16 Gage 103 Diameter of smaller disc VL-IV 3.3.16 Gage 104 Thickness of smaller disc VL-IV 3.3.16 Gage 105 Diameter of center hole VL-IV 3.3.16 Gage 106 Adhesive material missing or improper VL-IV 3.3.16 Visual 107 Moisture content of packing material VL-IV 3.7.2 4.5.7.2 108 Material verification for chipboard 1/ 3.2 6.2.e 109 Material verification for fiberboard 1/ 3.2 6.2.e

110 Material verification for adhesive 1/ 3.2 6.2.e

4.4.2.17

TITLE

Projectile, 81MM: Illuminating M853A1 Loading Assembly (During Assembly Operation, Prior to Body Loading) Projectile, 81MM: Infrared Illuminating M816 Loading Assembly (During Assembly Operation, Prior to Body Loading)

9381093

12953388

Next higher 9352621/ 13024001/ 12953389/ 13024002

101 Canister loading assembly swivel fails to rotate freely

100%

Manual 102 Shroud lines pulled out of parachute bag beyond max.

Gage 103 Taped shroud loops not attached to suspension wire loop

Visual 104 Length of excess wire improper VL-IV 3.3.17/3.3.18 1/ Gage 105 Pull force for oval sleeve crimps to suspension wire and suspension ring

2/

3.4

4.5.3 106 Tape missing from the oval sleeves and wires VL-IV 3.3.17/3.3.18 1/ Visual 107 Pull cord improperly attached to parachute assembly, parachute disc and drogue plate

3.3.17/3.3.18 3/

108 Improper length of steel cable loop with polyester sleeve

109 Polyester sleeve improperly compressed against crimp

Notes: 1/ Applies to all oval sleeves.

2/ See paragraph 4.4.3.1 3/ See Detail B on drawing number 9381093 for the M853A1 and on drawing number 12953388 for the

M816

4.4.2.18

TITLE

Projectile, 81MM: Illuminating M853A1 Loading Assembly (During Body Loading) Projectile, 81MM: Infrared Illuminating M816 Loading Assembly (During Body Loading)

Number

Next higher 9352621/ 13024001/ 12953389/ 13024002

101 Felt spacer misaligned or missing VL-IV 3.3.17/3.3.18 Visual 102 Canister loading assembly improperly seated VL-IV 3.3.17/3.3.18 Visual 103 Split sleeve improperly seated or missing VL-IV 3.3.17/3.3.18 Visual 104 Parachute liner damaged or missing VL-IV 3.3.17/3.3.18 Visual 105 Parachute bag closure cord not removed VL-IV 3.3.17/3.3.18 Visual 106 Separator disc improperly positioned or missing VL-IV 3.3.17/3.3.18 Visual 107 Cable loop attachment (only) not above separator disc

108 Parachute cup misaligned or missing VL-IV 3.3.17/3.3.18 Visual

Notes:

onformance inspection by classification of characteristics

4.4.2.19

TITLE

Projectile, 81MM: Illuminating M853A1 Loading Assembly (During Body Loading, Including Tail Cone Assembly) Projectile, 81MM: Infrared Illuminating M816 Loading Assembly (During Body Loading, Including Tail Cone Assembly)

Next higher 9352621/ 13024001/ 12953389/ 13024002

101 Silastic missing or improper VL-IV 3.3.17/3.3.18 Visual 102 Force to seat tail cone and body tube exceeded 3/ 3.3.17/3.3.18 Gage 103 Depth of rear shear pin holes VL-IV 1/ 3.3.17/3.3.18 Gage 104 Location of rear shear pin holes from end of body tube

VL-IV 1/

105 Diameter of rear shear pin holes VL-IV 1/ 3.3.17/3.3.18 Gage 106 Rear shear pin (s) missing or loose 100% 3.3.17/3.3.18 Visual 107 Rear shear pin(s) not flush or below 100% 3.3.17/3.3.18 Gage 108 Gap, max between tail cone and body tube VL-IV 3.3.17/3.3.18 Gage 109 Protective dust plugs missing 100% 3.3.17/3.3.18 Visual 110 Body loading disassembly 2/ 3.5 4.5.4 111 Material verification for silastic 4/ 3.2 6.2e

Notes: 1/ Alternate sampling plan may be used as specified in 4.4.3.2.

2/ Defect callout and sampling plan are depicted in 4.4.3.3.

3/ One (1) unit shall be inspected at the start and at the end of production shift and one (1) unit shall be inspected every two hours until the end of the shift. Any defect in a sample requires the rejection of production units since the last acceptable sample.

4/ See 4.5.1

4.4.2.20

TITLE

Cartridge 81MM: Illuminating, M853A1, w/Fuze MTSQ, M772 (Prior to Assembly of Fuze, Fin Assembly & Ignition Cartridge) Cartridge 81MM: Infrared Illuminating, M816, w/Fuze MTSQ, M772 (Prior to Assembly of Fuze, Fin Assembly & Ignition Cartridge)

Number 9352621/ 13024001/ 12953389/ 13024002

Next higher Final

Critical None Defined

101 Damaged threads on fuze VL-IV 3.3.19/3.3.20 Visual 102 Damaged threads on fuze body tube adapter VL-IV 3.3.19/3.3.20 Visual 103 Damaged threads on tail cone VL-IV 3.3.19/3.3.20 Visual 104 Damaged threads on fin VL-IV 3.3.19/3.3.20 Visual 105 Damage threads on ignition cartridge VL-IV 3.3.19/3.3.20 Visual 106 Damaged threads on cartridge housing VL-IV 3.3.19/3.3.20 Visual

TITLE

Cartridge, 81MM: Illuminating, M853A1, w/Fuze

MTSQ, M772

Cartridge, 81MM: Infrared Illuminating, M816, w/Fuze MTSQ, M772

Sheet 1 OF 2

9352621/ 13024001/

Conforma nce

Next higher Final

Critical 1 Fuze safety wire missing or not properly assembled

8/

2 Propelling charge support assembly missing, improperly assembled or damaged 8/

3 Propelling charge increment(s) missing, cracked or damaged to the extent that propellant will escape 8/

100% 4/

Visual/4.5.8 4 Warning stencil missing, incomplete, or incorrect 8/ 100% 3.3.19/3.3.20 Visual 5 Fin blade distorted or damaged 8/ 100% 3.3.19/3.3.20 Gage 6 Obturating ring missing 8/ 100% 3.3.19/3.3.20 Gage 7/ 7 Ignition cartridge cracked or damaged to the extent that propellant will escape 8/

100% 9/

8 Ignition cartridge not at least 0.020 inch below flush to bottom edge of fin 8/

101 Obturating ring tack weld missing 100% 3.3.19/3.3.20 Visual 102 Entire obturating ring including tack weld not flush or below bourrelet diameter

3.3.19/3.3.20 1/

103 Pull force for obturating ring 2/ 3.6 Gage/4.5.5 104 Fuze not set on “S” (shipping) position 100% 3.3.19/3.3.20 Visual 105 Inadequate torque applied to fuze VL-IV 3.3.19/3.3.20 Torque Test/

4.5.6 106 Inadequate torque applied to fin boom VL-IV 3.3.19/3.3.20 Torque Test/

4.5.6 107 Assembly fails to freely traverse alignment gage for

20 inches, min.

3.3.19/3.3.20 3/

108 Total length, max 100% 3.3.19/3.3.20 Gage 109 Inadequate torque applied to ignition cartridge VL-IV 3.3.19/3.3.20 Torque Test/

4.5.6 110 Propelling charge increment(s) cracked or damaged but not to the extent that propellant will escape

100% 4/

Visual/4.5.8 111 Ignition cartridge cracked or damaged but not to the extent that propellant will escape

100% 9/

Notes: 1/ Obturating ring inspection shall be performed at two places for each obturating ring, one at the tack weld and the other at 180 degrees from the tack weld.

2/ See 4.4.3.4.

3/ See drawing numbers 6518071 and 6518072.

4/ Inspection shall be performed before and after assembling propelling charges. After assembly, the propelling charges shall be inspected on the surfaces that interface with the fin boom during assembly (increment tips).

TITLE

Cartridge, 81MM: Illuminating, M853A1, w/Fuze

MTSQ, M772

Cartridge, 81MM: Infrared Illuminating, M816, w/Fuze MTSQ, M772

Sheet 2 OF 2

9352621/ 13024001/

Next higher

112 Ignition cartridge missing 100% 3.3.19/3.3.20 Visual 113 Ignition cartridge more than 0.020 but not at least

0.080 inch below flush to bottom edge of fin

114 Identifying strip missing (M816 only) 100% 3.3.19/3.3.20 Visual 115 Security of parts VL-IV 3.3.19/3.3.20 Manual 116 Protective finish damaged VL-IV 3.3.19/3.3.20 Visual

117 Markings incomplete, incorrect, illegible, or missing VL-IV 3.3.19/3.3.20 Visual

PROVING GROUND

First Article Test & Lot Acceptance Test 120/6 5/ 3.8 4.4.3.5/4.6 Lot Acceptance Test 70/6 6/ 3.8 4.4.3.5/4.6

Notes: 5/ 120 rounds shall be ballistic tested for first article and first production lot. Six (6) rounds shall be selected and used as test support rounds.

6/ 70 rounds shall be ballistic test for second and subsequent production lots. Six (6) rounds shall be selected and used as test support rounds.

7/ Gage used to detect for obturating ring not flush or below bourrelet diameter shall be used to detect for presence of obturating ring.

8/ See paragraph 6.8 e.

9/ Inspection shall be performed prior to assembling ignition cartridge to fin housing.

4.4.2.22

TITLE

Packing and Marking for Container, Ammunition, Fiber PA162 for Cartridge, 81MM: M816

Next higher 12993638

101 Fuze support assembly loose or missing VL-IV 3.3 Visual 102 Filler disc assembly missing or improper VL-IV 3.3 Visual 103 Cushion and fillers missing VL-IV 3.3 Visual 104 Container damaged VL-IV 3.3 Visual 105 Sealing strip incomplete, badly wrinkled or missing VL-IV 3.3 Visual 106 Contents loose VL-IV 3.3 Visual/Manual 107 Length of fiber container (max) VL-IV 3.3 Gage 108 Orange dot marking missing (M816 only) VL-IV 3.7.1 Visual 109 Marking missing, misleading or unidentifiable VL-IV 3.7.1 Visual/4.5.7.1 110 Material verification for sealing strip 1/ 3.2 6.2.e

201 Length of sealing strip tab (min) VL-II 3.3 Gage 202 Evidence of poor workmanship VL-II 3.9 Visual

4.4.2.23

TITLE

Packing and Marking for Container, Ammo, PA156 & PA157 for Cartridge, 81MM (unsealed)

12944509

Next higher

101 Container loose or improperly packed in metal can VL-IV 3.3 Visual/Manual 102 Fiber containers improperly oriented VL-IV 3.3 Visual 103 Cap ends missing or damaged VL-IV 3.3 Visual 104 Moisture content of packing material VL-IV 3.7.2 4.5.7.2 105 Support assembly damaged, missing, or improperly placed

3.3

201 Plastic sheet not present in every sixth metal box VL-II 3.3 1/ Visual 202 Graphical firing scale not present in every third metal box

VL-II

3.3 1/

203 Evidence of poor workmanship VL-II 3.9 Visual

Notes: 1/ Quantities and locations are specified on drawing number 12944509 and 12993638, notes P4 and P6.

4.4.2.24

TITLE

Packing and Marking for Container, Ammo, PA156 & PA157 for Cartridge, 81MM (sealed)

12944509

Next higher

101 Content of metal container loose VL-IV 3.3 Manual 102 Cover assembly not secure VL-IV 3.3 Visual 103 Security wires missing, broken or improper VL-IV 3.3 Visual 104 Marking missing, misleading or unidentifiable VL-IV 3.7.1 Visual/4.5.7.1

4.4.3 Testing.

4.4.3.1 Pull force for oval sleeve crimps to suspension wire and suspension wire ring.

Pull force shall be conducted in accordance with paragraph 4.5.3 (see drawing 9209555-8, 9381075, 9381093 and 12953388). Pull force for the oval sleeve crimps shall be conducted individually on suspension wire and suspension ring. Beginning with the first production shift, oval sleeve crimps are to be inspected periodically during the shift at a rate to equal or exceed three (3) units per every (2) hours until the end of the production shift. The pull force shall be conducted in accordance with paragraph 4.5.3. Any defect in a sample requires the rejection of production units since the last acceptable sample.

4.4.3.2 Examination of depth, diameter and location of rear shear pins holes. The location, depth and diameter of the shear pin holes shall be inspected in the following manner using approved gages. Beginning with the first production shift, ten (10) consecutive drilled inert units shall be inspected and found defect free prior to rate production. Then inspect five (5) units every two hours until the end of the shift. Five (5) units shall be inspected at the end of the shift.

If a defect is found in any of the five (5) units, the machine set up shall be adjusted until ten (10) consecutive units are defect free. Any defect in a sample requires the rejection of production units since the last acceptable sample. The machine set up shall be adjusted until ten (10) consecutive units are defect free.

4.4.3.2.1 Sampling plan procedure. The sampling plan procedure depicted in 4.4.3.2 shall be applicable to each drilling machine/equipment setup.

4.4.3.2.2 Tooling change. A change of tooling will require a first piece inspection prior to continuing production. The sampling plan will be the same as the prior to the tooling change.

4.4.3.3 Body loading disassembly. Beginning with the first projectile loading assembly lot, units are to be inspected periodically during the shift at a rate to equal or exceed five (5) units per every (2) hours until the end of the production lot. The pull apart test shall be conducted in accordance with paragraph 4.5.4.

4.4.3.4 Pull force for obturating ring. One obturating ring sample, minimum, after every

100 projectiles, shall be assembled to a fixture, heat sealed and tested as specified in 4.5.5.

However, this test must be performed at the start of a production run or whenever a production run is stopped and restarted for any reason. Failure of the sample to meet the requirements shall cause for those 100 preceding projectiles, represented by the sample, to be re-banded and retested.

4.4.3.5 Proving ground testing.

4.4.3.5.1 First article test and first production lot acceptance. One hundred and twenty

(120) samples cartridges shall be selected for first article testing and first production lot acceptance testing. The cartridges shall be separated into three groups; one group (24 samples) conditioned for 24 hours at +145 ±2.5 °F, one group (72 samples) conditioned for 24 hours at +70 ±2.5 °F, and one group (24 samples) conditioned for 24 hours at –25 ±2.5 °F. An additional six

(6) sample cartridges shall be selected and used as test support rounds for first article and first production lot testing. These test support cartridges shall be separated into three groups; one group (2 samples) conditioned for 24 hours at +145 ±2.5 °F, one group (2 samples) conditioned for 24 hours at +70 ±2.5 °F, and one group (2 samples) conditioned for 24 hours at –25 ±2.5 °F.

The quantities shall be tested at charges as indicated in Table IV.

4.4.3.5.1.1 Combined first article test and first production lot acceptance. It is anticipated that some of the production lots may be produced in small quantities. In this case, a single ballistic lot acceptances test (BLAT) consisting of multiple production lots of up to a maximum of seven (7) production lots shall be tested. Multiple lot formation shall be controlled by the same interfix number of its components and shall be produced consecutively in the same loading, assembling, and packing (LAP) process. The total quantity from the combined lots shall not exceed 30,000 cartridges. Test samples taken from each of the multiple lots shall be randomly selected from each continuous production lot and shall be in proportion to form a total of one hundred and twenty cartridges (120). However, no production lots shall have less than ten (10) test samples. An additional six (6) sample cartridges shall be selected and used as test support rounds for ballistic testing. Test samples shall be separated into three groups conditioned at 145 + 2.5˚F, 70 + 2.5˚F, and -25 + 2.5˚F for 24 hours. See paragraph 6.6.1 for grouping of cartridge quantities per charge.

4.4.3.5.2 Production test. After successfully completing the first production lot acceptance test, for the subsequent production lots, seventy (70) samples shall be selected for this test. The cartridges shall be separated into three groups; one group (14 samples) conditioned for 24 hours at +145 ±2.5 °F, one group (42 samples) conditioned for 24 hours at +70 ±2.5 °F, and one group (14 samples) conditioned for 24 hours at –25 ±2.5 °F. An additional six (6) sample cartridges shall be selected and used as test support rounds for production lot testing. These test support cartridges shall be separated into three groups; one group (2 samples) conditioned for 24 hours at +145 ±2.5 °F, one group (2 samples) conditioned for 24 hours at +70 ±2.5 °F, and one group (2 samples) conditioned for 24 hours at –25 ±2.5 °F. The quantities shall be tested at charges as indicated in Table IV.

TABLE IV: Proving ground tests for M853A1 and M816.

145 ± 2.5o F 70 ± 2.5o F -25 ± 2.5o F

ROUND

TYPE

CHARGE

NUMBER

FIRST

ARTICLE/

FIRST

LOT

PROD

LAT

FIRST

ARTICLE/

FIRST

LOT

PROD

LAT

FIRST

ARTICLE/

FIRST

LOT

PROD

LAT

M853A1 1 12 7 36 21 12 7 M853A1 4 12 7 36 21 12 7

M816 2 12 7 36 21 12 7 M816 4 12 7 36 21 12 7

4.4.3.5.2.1 Combined production test. It is anticipated that some of the production lots may be produced in small quantities. In this case, a single ballistic lot acceptances test (BLAT) consisting of multiple production lots of up to a maximum of seven (7) production lots shall be tested. Multiple lot formation shall be controlled by the same interfix number of its components and shall be produced consecutively in the same loading, assembling, and packing (LAP) process.

The total quantity from the combined lots shall not exceed 30,000 cartridges. Test samples taken from each of the multiple lots shall be randomly selected from each continuous production lot and shall be in proportion to form a total of seventy cartridges (70). However, no production lots shall have less than ten (10) test samples. An additional six (6) sample cartridges shall be selected and used as test support rounds for ballistic testing. Test samples shall be separated into three groups conditioned at 145 + 2.5˚F, 70 + 2.5˚F, and -25 + 2.5˚F for 24 hours. See paragraph 6.6.1 for grouping of cartridge quantities per charge.

4.4.3.5.3 Cartridge acceptance criteria for M853A1 and M816

4.4.3.5.3.1 Individual acceptance criteria. The test shall be performed as specified.

Defect classification and accept/reject criteria shall be in accordance with the following table:

TABLE V – Individual acceptance criteria.

Categories Defect Accept Reject

Critical Premature burst or metal parts separation 0 1 Critical

Short round

Major Fuze non-function or non-separation of tail cone from body tube assembly

1 2

Major Misfire 1 2 Major Fuze functioning time (See Note 1 and

4.4.3.5.6) Major Illuminant fails to ignite or fails to provide effective illumination for at least 50 seconds when tested at -25oF and 70oF and at least 45 seconds with group average at least 50 seconds when tested at 1450F for the M853A1.

Illuminant fails to ignite or fails to provide effective illumination for at least 60 seconds for the M816.

(See Note 2, 3 & 4 and 4.4.3.5.4/4.4.3.5.5/6.8)

Note 1: If the fuze performance of any round in the sample fails to meet the individual fuze functioning time requirements in paragraph 3.8.6.4 and the round functions properly in all respects with the exception that the “effective illumination” time is less than 50 seconds for M853A1 or 60 seconds for M816 because the illuminant and parachute assembly hit the ground while still burning, the illuminant time defects shall not be counted against the round. The individual fuze functioning time failure will be counted against the round and will be added to the number of illuminant time defects.

Note 2: If the fuze performance of any round in the sample meets the individual fuze functioning time requirements in paragraph 3.8.6.4, the performance of the cartridge shall be considered valid for evaluating the acceptability of the lot for illumination time defects.

Illumination time defects can be caused by the cartridge, the payload, or the candle. Some examples of cartridges related failures modes are: poor propulsion system performance, poor obturation, or excessive drag during cartridge flight. Some examples of payload failure modes are: streaming chute/ripped chute, partial or fully tangle chute, chute fails to deploy and chute detaches from canister. Some examples of candles failures modes are: candle non-ignition, illuminant dropout, incomplete burn, or inadequate illumination time.

Note 3: If the fuze performance of any round in the sample meets the fuze functioning time requirements and functions below 300 meters for M853A1 or below 350 meters for M816 above ground level, the performance of the cartridge will not be considered valid for evaluating the acceptability of the lot of illumination time defects.

Note 4: For M853A1 cartridge, the effective illumination below 50 seconds at +145oF, charge 4 shall not be counted as functional defects if the following conditions are satisfied:

1) The average for the group is at least 50 seconds.

2) No individual burn times are below 45 seconds."

4.4.3.5.4 Overall acceptance criteria for M853A1 cartridge. In addition to the individual acceptance/reject criteria of 4.4.3.5.3, the following acceptance criteria shall be used:

a. The first article test allows a maximum of four (4) major defects for illumination less than 50 seconds in the air. However, if either one misfire or one non-separation/non-function defect occurs, a maximum of three (3) additional major defects are allowable for illumination less than 50 seconds in the air. If one misfire and one non-function/non-separation defect occurs, a maximum of two (2) additional defects for illumination less than 50 seconds are allowable. If either two or more misfires or non-function/non-separation defects occur during testing, the first article lot shall be rejected (see Note 4).

b. The first production lot acceptance test allows a maximum of five (5) major defects for illumination less than 50 seconds in the air. However, if either one misfire or one non-separation/non-function defect occurs, a maximum of four (4) additional major defects are allowable for illumination less than 50 seconds in the air. If one misfire and one non-function/non-separation defect occurs, a maximum of three (3) additional defects for illumination less than 50 seconds are allowable. If either two or more misfires or non-function/non-separation defects occur during testing, the first production lot shall be rejected (see Note 4).

c. Production lots (lot 2 and on) test allow a maximum of three (3) major defects for illumination less than 50 seconds in the air. However, if either one misfire or one non-separation/non-function defect occurs, a maximum of two (2) additional major defects are allowable for illumination less than 50 seconds in the air. If one misfire and one non-function/non-separation defect occurs, a maximum of one (1) additional major defects for illumination less than 50 seconds is allowable. If either two or more misfires or non-function/non-separation occurs during testing, the production lot shall be rejected (see Note 4).

4.4.3.5.5 Overall acceptance criteria for M816 cartridge. In addition to the individual acceptance/reject criteria of 4.4.3.5.3, the following acceptance criteria shall be used:

a. The first article test and first production lot acceptance lot allows a maximum of five

(5) major defects for illumination less than 60 seconds in the air. However, if either one misfire or one non-separation/non-function defect occurs, a maximum of four (4) additional major defects are allowable for illumination less than 60 seconds in the air. If one misfire and one non-function/non-separation defect occurs, a maximum of three (3) additional defects for illumination less than 60 seconds are allowable. If either two or more misfires or non-function/non-separation defects occur during testing, the first article or first production lot shall be rejected.

b. Production lots (lot 2 and on) allow a maximum of three (3) major defects for illumination less than 60 seconds in the air. However, if either one misfire or one non-separation/non-function defect occurs, a maximum of two (2) additional major defects are allowable for illumination less than 60 seconds in the air. If one misfire and one non-function/non-separation defect occurs, a maximum of one (1) additional defects for illumination less than 60 seconds are allowable. If either two or more misfires or non-function/non-separation defects occur during testing, the first article or first production lot shall be rejected.

4.4.3.5.6 Acceptance criteria for fuze.

4.4.3.5.6.1 The lot shall also be rejected if the percent lot defective for fuze functioning time as computed with the use of MIL-STD-1916, acceptability criteria, paragraph 5.2.2.2.3.b, less than the k value specified in Table III at a verification level II.

4.5 Methods of inspection

4.5.1 Material verification. Material verification shall be based on compliance to the notes on all the applicable drawings.

4.5.2 Surface finish. The texture comparison specimens prescribed by ASME B46.1 shall be used as a basis for surface roughness determination. Four (4) power magnification shall be used in performing visual examination.

4.5.3 Pull force for oval sleeve crimps to suspension wire and suspension wire ring. The pull force sample is an assembly which consists of a suspension wire ring and a parachute cable as delineated in drawing 9381093 and see detail C of dwg.12953388. The test sample shall be assembled on an universal testing machine. One end of the pulling device shall be attached to the suspension wire ring. The fixture that comes into contact with the suspension wire ring shall simulate the pin on drawing 9381088. The other end of the pull device is attached to the cable loop where the parachute shroud lines would be connected. The applied load shall be in an axial direction until the required pull force is exerted. The rate of travel of the machine shall be two inches per minute maximum.

4.5.4 Body loading disassembly. The projectile loading assemblies shall be subjected to a load (pull) sufficient to shear off the pins; slowly remove the body tube assembly from the tail cone, hold the drogue plate to prevent movement of the components inside the body tube. Inspect the double strand overhand knot. If one overhand knot is found to be improper, the sample shall be classed defective. Slowly remove the drogue plate and inspect the parachute bag pull cord. If the pull cord is not about half coil between the drogue plate and parachute disc and the other half between the parachute disc and parachute bag, and/or the pull cord is pinch between the drogue plate and/or split sleeves, the sample shall be classed defective. Remove the parachute and inspect for presence of the bag closure cord, if cord found the sample shall be classed defective.

The inspection samples may be used for production if no defect is found. If the cable is frayed, kinked or deformed, the sample shall be classed as defective. Inspect the steel cable loop for presence of polyester sleeve. If the polyester sleeve is missing or improperly compressed against crimp, the unit shall be classed as defective. Any defect in a sample requires the rejection of production units since the last acceptable sample. The inspection sample may be used for production if no defect is found. The components from the inspection samples may be used for production if they are not damaged. The body tube assembly and tail cone can be reused with up to two (2) sets of four (4) holes max. However, the second set of the 4 holes must be 45 degree off-phase from the first set and all blank holes must be completely sealed with silastic to prevent any possible moisture getting into the body loading assembly. Apply silastic below flush of the body tube. Removal of any silastic is required if it is found on the surface of the body tube or tail cone.

4.5.5 Pull force for obturating ring. Properly install and weld an obturating ring onto a simulated 81mm body groove of the correct size and shape (see projectile body drawing) with a relief for a pull test hook. Apply the required load perpendicular (radially and in a direction away from the center axis) to the tack weld. If the tack weld fails to meet the strength requirement, replace the obturating ring on all rounds since the last successful test.

4.5.6 Torque test. The samples supplied in accordance with 4.4.2.21 shall be tested by applying the minimum required torque to the components in the direction of assembly before the thread sealing compound has set. Any perceptible movement of parts will be considered as failure of the assembly to comply with the requirement with dwg.

9352621/13024001/12953389/13024002.

4.5.7 Marking, shipping and storage configuration.

4.5.7.1 Configuration. The packaging and its marking for 81mm M853A1 cartridge shall be visually inspected for compliance with drawing numbers 12993640, and 12944509. The packaging and its marking for 81mm M816 cartridge shall be visually inspected for compliance with drawing numbers 12993640 and 12993638.

4.5.7.2 Paper and wood material. Paper and wood material moisture content shall be determined in accordance with ASTM D4444 or ASTM D644. All packaging material shall be thoroughly dry at the time of packaging, 9% maximum moisture content is allowed.

4.5.8 Damaged propelling charge. To ascertain that a damaged propelling charge is to be classified as…