NAVY MIL-G-21615 (2)-1963 GUNS AIRCRAFT 20MM MARK 12 MOD 0 AND MOD 3《20MM记录12改变0和改变3飞机枪炮》.pdf

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1、MIL-G-2LbLS (2) LO 97977Ob OLIb377 b 25 Fehruary 1963 SUPERSEDING AMENDMENT 1 15 September 1961 MILITARY SPECIJ?ICATION GUNS, AZRCRAET, 20MM MARK I2 AND HID 3 MID O This amendment forms a part of Military Specification MLL-G- Si615(ep) of 24 September 1958 and has been approved by the Bureau of Nava

2、l Weapons, Department of the Navy. By this amendment basic specificationMIL-G-21615(NOrd) is changed to read MU;-G-21615(Wep, and throughout the specification Bureau of Ordnance shall be changed to read Bureau of Naval Weapons. Page 7, paragraph 3.16, Defects: Delete “(see appendix) I and insert d(

3、see Appendix A) l. Page 7, paragraph 4.1, Sampling: Delete the words “by the Government Inspector“ and If or Government inspection. If Page 8, paragraph 4.3.1, General: Delete entire paragraph 4.3.1 and add the following new paragraph: 4.3.1 Responsibility for inspection - Unless otherwise specified

4、 in the contract or purchase order, the supplier .is responsible for the per- formance of all inspection requirements as specified herein. Except as otherwise specified, the supplier may utilize his own facilities or any commercial laboratory acceptable to the Government. the right to perform any of

5、 the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. The Government reserves Il Page 10: Delete entire paragraph 4.4.2 and add the following new paragraph: 4.4.2 Spare parts and replacement par

6、ts. Spare parts and re- placement parts shall be tested in accordance with 4.4.6.2, 4.4.6.3 or 4.4.8.5. Page 14, paragraph 4.4.5.4, Rate of Fire: Delete “(see appendix) I and insert “(see Appendix A II. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,

7、-HIL-G-IILS (2) LO m 99979Ob 0463779 m MIL-C-21615 (Xep) 4MENDmNT 2 Page 15, paragraph 4.4.6.3.1, Pressure parts: Under Recoil Housing Outer Sleeve add “Extractor Spring“, Page 16, paragraph 4.4.8.3, Records : Delete “See appendix“ and insert “See Appendix A“. Page 16: Delete entire paragraph 4.4.8.

8、5 and add the following new paragraph: 4.4.8.5 Replacement parts. In addition to the pressure parts selected and tested according to 4.4.6.3.1, the .first two pre-production samples of each pressure part listed below, along with production lot samples selected in accordance with 4.1, shall be submit

9、ted to a test activity to be designated by the Bureau of Naval Weapons for the endurance firing of 2000 rounds of standard ammunition (see 4.4.5.8) in burts of not more than 50 rounds each. The guns shall be serviced according to 4.4.8.2. Bolt. R. H. Breechblock Slide. Breechblock Lock. L. H. Breech

10、block Slide. Breechblock Locking Key. Extractor. Extractor Spring. Recoil Housing Outer Sleeve. Page 16, paragraph 4.4.9.2, Time travel records: Delete “(see appendix) and insert Ir( see Appendix AI“. Page 19, paragraph 4.5.1.2.2, Replacement parts lot, subparagraph b . : Add Isrr to sample. After 4

11、.4.6.3 add “and 4.4.8.5“. Page 20: Delete entire paragraph 4.5.4 and add the following new paragraph: 4.5.4 Life expectancy all parts. All parts shall have an ex- pected life of at least 2000 rounds (see parts replacement schedule, NAVWEPS OP 1866 - latest revision). completion of the endurance test

12、s (2000 rounds) may be found to have small cracksl when subjected to magnetic particle inspection in accordance with specification MIL-1-6870 e long, and not visible to the noml unaided eye, and which do not extend through an important section formed by boundary planes of the part, will not be consi

13、dered as major defects (see 4.5.1.1.2) but shall be promptly reported to the procuring activity. durance firing and are visible to the !.,t:,ded eye shall be classified as major defects if the size and locatiori .a such that tl-e I.nter“:iii purpose and proper functioning of the part is affected“. P

14、arts which have performed for the Such cracks so revealed, if not over -$ inch Clnxks which develop during en- . 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-2LbLS (2) LO M 777770b 0463780 4 M Page 20, add the following new paragraph: 4.5.

15、4.1 Crack Criteria. to cracks which develop in critical areas during endurance firing and are visible to the normal unaided eye“. “The criteria in Appendix B shall apply Page 20, paragraph 4.5.5, Spare parts and replacement parts: After 4.4.6.3 add “and 4.4.8.5“. Page 23, Appendix After “Appendix“ a

16、dd “A“. Page 27 Remove IC- before m-21615(ep) at top of page Pa e 28 Remo* before MIL-G-216L5(Wep) at top of page. Add the following new pages: Identification for Breechblock %lt. Page 30, 3i Appendix B - Crack Criteria 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without l

17、icense from IHS-,-,-MIL-G-2LbLS (2) LO W 999990b 04b3781 b Mn-G21615 (Wep) AMENDMENT 2 rCRACK NO. 9 a CRACK NO.I- /i,RAcK i NO. 3 CRACK NOS. 4 % 5 CRACK NOS.66 7 LOCATED FARSIDE IN SAME AREA VIEW A CRACK N0.I -CRACK NO. 3 CRACK NOS. 4& 5 -CRACK NO. 10 CRACK NO. 1 VIEW C - LCRACK NO. IO FIGURE 6,-CRA

18、CK IDENTIFICATION FOR BREECHBLOCK 4. BOLT Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-2LbIS (2) LO m 9999906 04b372 m bfIL-G21615 (Wep) AMENDMENT 2 ApI33NDI.X B CRACK CRITERIA GUNS, AIRCRAB“, 20MM MK 12 MID O AND MJD 3 10. SCOPE 10.1 reject

19、ion of critical components containing visible cracks. and specifies the critical areas and methods for determining acceptability. This appendix covers criteria to be used for acceptance and It describes 20. 20 .l 30 30 .i 30.2 30.2 .i 30.2.1.1 closed by APPLICABrn DOCUMENICS None CRITERLA General -

20、No area or piece of a part shall be completely en- a crack. If so the part shall be rejected. Specific Bolt, Breechblock - See Figure 6 Rear Stop Area (Crack No. 1) - A crack which originates on either side of the rear stop at the intersection of surfaces (a) and Lb). - inch on the front or back of

21、the rear stop (surfaces (c) and (a). !views B and CI. (View A) shall be cause for rejection if it progresses more than 30.2.1.2 at the junction of the radius stop and the main bolt body on either side (surfaces (e), (f), (g), and (b) (Views A an B) shall be cause for Radius Stop Area (Cracks 2 and 3

22、) - Crack No. 2 - Originating rejection if it progresses more than $ inch down-on the curved surface . will be permitted to progress all the way across s.urfaces (e) and providing no pieces fall out (Views A and B). 6, and 7) - These cracks will Rear Key Slot Area (Cracks 4, 5, Crack Na. 3 - This cr

23、ack located on the radius portion of surface b iei 30.2.1.3 be permitted to progress inward through the thin upper section (h) of the key slot area on either side to the slanted surface (i) and will not be cause for rejection unless pieces of metal break out (Views A and B) . 5 Provided by IHSNot fo

24、r ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-ZLbL5 (2) LO m 99999Ob OVb3783 T M MIL-G-21615 (iJep) 4MENDMENT 2 30.2.1.4 in this surface (j) shall be allowed unless they progress to the milled Extractor Spring Pocket Area (Crack 8) - Cracks which appear slot and

25、pieces fall out (Views B and C). 30.2.1.5 until it progresses to the point where pieces of metal fall out (View A. Firing Pin Contact Area (Crack 9) - This crack will be permitted 30.2.1.6 mitted through the hole and across surface (k) providing no pieces fall out. Extractor Pin Hole Area (CracklO) - This crack will be per- 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-