1、1. MIL-S-81245 LO M 7777Ob 0358873 7 I $-OP-a5 MIL-S-81245 (wp.) 21 April 1965 MILITARY SPECIFICATION L/20MM CARTRIDGES HOLDER, RAD HAZ SHIELD This Specification has been approved by the Bureau of Naval Weapons, Department of the Navy. SCOPE 1.1 This specification covers the rad haz shield, hereinaf
2、ter referred to as “shield“ and the rad haz shield holder, hereinafter re- ferred to as “holder“. The shield serves as a protective cover for the electric primer of a 20mm MARK100 series round of ammunition belted in the MARK 2 link. 2. APPLICABU DOCUMENTS 2.1 of invitation for bids or request for p
3、roposal, form a part of the specifi- cation to the extent specified herein. The following documents of the issue in effect on the date SPECIFICATIONS Federal w-L-800 Military MIL-L- i672 7 m-p-16232 Lubricating Oil, General Purpose, Pre s ervat ive, (Water -Displacing , LOW Temperature). Link, Ammun
4、ition, 20m, MARK 2, Phosphate Coatings, Heavy, Manganese or Zinc Base, (For Ferrous Metals) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. Federal Test Method . Standard NO. i$i Military MIL-STD-129 PUBLICATIONS Bureau of Naval Weapons OP 1866 DRA
5、WINGS Bureau of Naval Weapons (Code ident OOO) 2 64723 2164725 2164728 534529 LD 534561 Metals Test Meth O, 2, and 3, ,D 534561 (See 4.6.2.4). Shield-holder 3.5.3 - 3 06 Finish. Burrs. All burrs should be removed from shields and holders. - 3.6.1 Cutting, stamping, and forming operations shall be pe
6、rformed in such a manner that all burrs which may be formed will be directed toward the outside of the shield. No burrs shall be permissible on the protective tab of the shield or retaining tabs of the holder, 3.6.2 Protective coating. Subsequent to appropriate hardness treat- ment, both shields and
7、 holders shall receive the protective coating specified by the applicable drawings (See Section 2). 3.7 Environmental requirements. 3.7.1 Each shield and holder tested in accordance with 4.6.1.2 shall be examined visually for evidence of rust. Each shield shall show no more than four easily discerni
8、ble rust spots, each measuring not more than 1/8 inch in diameter or equivalent area. Each holder shall show not more than eight easily discernible rust spots of the specified area. not be considered when measuring the area of rust spots. Resistance to salt spray, Rust staining, rust drainage, and e
9、dge Xust shall 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.7.2 Temperature extremes. The shields shall comply with the requirements of 3.5.1 and 3.5.2 at any temperature between minus 70 degrees Fahrenheit (P) and plus 165 degrees F. 3.8 Gove
10、rment-furnished property. wunition boxes, LD 165132, in quantities pecified in the contract or order, are required to comply with the packaging requirements of Section 5. 3.9 Government-luaned property. The following are required to determine rhield conformance with the requirements of this opecific
11、ation: - (a) puiomy Rounds, Zckpm, MUK 103, MID O. (b) Links, 2omSi, BUK 2, MJDS O, 1, and 2. 3.10 Packaging, p acking, and markinq. Packaging, packing, and marking of the shield asremblies shall conform go the requirements of Section 5 of this specification. 3.11 Shields and holdero shall be unifor
12、m in quality and temper, and shall be free from laminated metal (complete separation of the metal at some point), excessive scale, scraps, splits, cracks, seams, 8nd other defects. The quality of workmanship shall assure conformance to all requirements of this specification and the applicable documg
13、nts listed in Section 2. The standards of workmanship exhibited in any approved pre- production sample, subject to any qualification stated in the Government notice of approval, shall be determinative of the requirements of the contract relative to workmanship insofar as not specifically coverer? by
14、 applicable specifications. - Workmanship. 3.12 applicable documents referenced ia Section 2, unless specified in con- tract or order. - Data. No data is required by this specification, or by (Sea paragraph 6.2.) 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise spe
15、cified in the contract or purchase order, the supplier is responsible for the per- formance of all inspections specified herein. the supplier may utilize his own facilities or any comercial laboratory acceptable to the Government. any of the inspections set forth in this specification where such ins
16、pections are deemed necessary to asaure that supplies and services conform to prescribed requirements. Except as OtherWi8e specified, The Gvernment reserves the right to perform 4.2 Clasrification of inspection, Inspection and testing of the shields and holders shall be classified as follows: (a) Pr
17、eproduction inspection. (b) Quality conformance inspection. 4.3 by the same proceso at the same plant locations, and submitted for Government - Lot. A lot: shall consist of all shields and holdere manufactured Provided by IHSNot for ResaleNo reproduction or networking permitted without license from
18、IHS-,-,-MIL-S-81245 LO U 7777706 0358877 4 U MIL-S-81245 (WP) . acceptance at the same time, except that the lot size shall not exceed 20,000 shields and 2000 holders. 4.4 Sampling. 4.4.1 Preproduction sample. A preproduction sample of 600 shields and 70 holders manufactured in accordance with 3.1 s
19、hall be subjected to the following tests and inspections: Examinaijion or Test Requirement Paragraph Group I Material, Design, and Worktanship Group II Salt Spray Group III Bench Tests Group IV Flight Tests 3.2, 3.3, 3.4, 36 and 3.ll 3.5.1 and 3.52 3.5.1 and 3.5.2 Method Paragraph 4.6.1.1 4.6.1.2 4-
20、.6.2.5 4.6.2.6 No. of Sample Units to be Inspected 40 shields 10 holders 10 shields 5 holders 150 shields 400 shields No. of Defectives Allowed O O O O See 4.6.2.7.1 See 4.6.2.7.2 Acceptance of the preproduction sample shall be based on no defects. production by the supplier prior to apprwal of the
21、preproduction lot shall be at the suppliers risk. Any 4.4.2 Quality conformance inspection sampling. The sampling plans and procedures set forth in Standard MIL-STD-105 shall be used in the determination of acceptability of the shields and holders tested and inspected as specified in 4.5 and 4.6.1.
22、4.5 Examination. 4.5.1 shall be ascertained that all components procured under separate documents have been inspected, tested, and accepted in accordance with their respective documents. Components. Prior to assembly of %he shield and holder, it 4.5.2 marking of the shield assemblies conform to the
23、requirements of Section 5 of this specification. Bcking and. marking. It shall be ascertained that packing and Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-S-LLIS LO E 7777Ob 0358878 b W 4.6.1 Acceptance tests, 4.6.1.1 Visual and mechanical i
24、nspection. Shield and holder samples selected in aFcordance with 4:4.2 shall be tested for. conformance to 3.2, 3.3, 3.6, 3.10, and 3.U. Lot Quality shall be Judged in accordance with Standard MIL-STD-105, Inspection Level II, Acceptable Q Right hand feeding. Repeat the tests prescribed in 4.6.2.5.1
25、.1, but using 75 new shields not previously tested, and EWRK 2, MOD 2 links, plus MARK 2, MOD 1 end links. 4.6.2.5.2.2 Left hand feeding, Repeat the tests prescribed in 4.6.2.5.1.2, but re-using the same shields used in the test of 4.6.2.5.2.1. 4.6.2.5.3 of 4.6.2.5.2.1 and 4.6.2-5.2.2. Each shield s
26、hall be used a total of two times for the tests 4.6.2.5.4 testing of that lot shall be terminated. If shield breakage or link-shield separations (partial or total detachment of the shield from the link) occur which do not cause rejection of the lot, remove the broken or dislodged shields and continu
27、e testing (See 4.6.2.7). and link-shield separations shall- be kept for each lot. When shield failures occur which cause a lot to be rejected, Records of shield breakages Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-81245 10 = 7777906 035870
28、0 O U MIL-S-8124.5 (WP) 4.6.2.6 Flight tests. 4.8.2.6.1 Preproduction lot. Four hundred shields from each preproduction lot (4.6.2.1) shall be subjected to flight tests (See 4.6.2.6.3). 4.6.2.6.2 Production lot. When requested by the procuring activity, the contractor shall furnish 400 shields from
29、each production lot (not a part of the samples submitted in accordance with 4.6.2.2), for shipment to a Naval test activity (as designated by the Bureau of Naval Weapons), for flight tests. No production lot shields shall be submitted for flight tests unless specified in the contract, order, or by t
30、he procuring activity (See 6.2). These shields shall be furnished at no costto the Government. 4.6.2.6.3 Flight test waiver. The procuring activity may waive the flight tests requirements of 4.6.2.6.1 provided that the contractor has demonstrated his ability to conform with the requirements of this
31、specification under previous contracts covering manufacture of shields. No preproduction lot shieltkfor flight tests shall be delivered to the testing activity when the procuring activity waives the requirements of 4.6.2.6.1 (See 6.2). 4.6.2.6.4 Test requisitions. The flight tests shall include the
32、following: (a) Use of a current operational Navy aircraft equipped with (b) Use of MARK 2, MOD O and/or MARK 2, MOD 2 links, plus MARK 2, (c) Ammunition to be lightly oiled with lubricating oil conforming (d) Firing from one or more MARK 12 MOD O guns equipped with the at least one MARK E, 20mm gun
33、known to have a cyclic rate of at least 925 rounds per minute. MOD 1 end links. with W-L-800 or equivalent. MARK 7 MOD 2 feed mechanism. 4 . 6.2 . 6.5 shall be burst fired while the aircraft is subjected to three to five “gs“ and an air speed of at least 500 knots. At least two hundred rounds of shi
34、eld equipped ammunition 4.6.2.7 Acceptance criteria. 4.6.2.7.1 The entire lot shall be rejected if one shield breaks, or one link-shield separation occurs during the first use of the shields. If no shield breakage or link-shield separation occurs, then proceed to Step 2. Step 2. shields break, or tw
35、o or more link-shield separations occur during the second use of the shields. in combination will also reject the lot. 4.6.2.7.2 from one or more shield breakages or one or more link-shield separations. Lot disposition for the tests of 4.6.2.5 shall be as follows: Step I. The entire lot shall be rej
36、ected if two or more One shield breakage and one link-shield separation Lot disposition for the tests of 4.6.2.6 shall be as follows: The entire lot shall be rejected for failure-to-fire resulting Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL
37、-S-81245 10 I7779706 0358901 2 = MIL-S-8124.!?WP) 4.6.2.7.3 faulty links (broken, cracked, deformed, etc.), faulty link chutes, and other defective testingequipment shall not be counted as failures of the shields during the tests prescribed in 4.6.2. Link-shield separations ad shield breakages cause
38、d by 4.6.2.7.4 subsequent to eJection from the link chute shall not be used as criterion for failure of the shields during the tests prescribed in 4.6.2.5. Link-shield separations and shield breakages occurring . 5- PBPAFATION FOR DELIVERY 5 01 Preservation and packaging. Presemtion and packaging sh
39、ay be level A, or C as specified (See 6.2). 5.1.1 Level A. 5.1.1.1 Preservation. The supplementary oil finish applied subsequent to phosphate coating, as specified by the applicable drawings, shall serve as the preservative for the shields and holders. is required. No additional preservative 5.1.1.2
40、 Unit packaging. Not applicable. 5.1.2 Level C. 5.1.2.1 Preservation. Preservation shall be as specified in 5.1.1.1. 5.1.2.2 Unit packaging. Not applicable. 5 02 Packing. 5.2.1 kvel A. 5.2.1.1 Exterior containers. Shield assemblies, in numbers specified in the contract or order (See 6.2), shall be p
41、acked into containers con- forming to drawings listed in LD 534529. 5.2.1.2 Cushioning. The pack shall incorporate sufficient cushioning material, bracing, or other adequate shock absorbing devices, to ensure that the shield will meet all of the requfiemeirts of Section 3. 5.2.2 Level C. 5.2.2 .i Ex
42、terior containers. Shield assemblies, in numbers specified in the contract or order (see 6.21, shall be packed to afford protection against damage during direct shipment from the supply source to the first receiving activity for immediate use. Shipping containers shall conform to the carrier rules a
43、nd regulations applicable to the mode of transportation. 5.2.2.2 Cushioning. Cushioning shall be as specified in 5.2.1.2. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
