1、MIL-C-7075 13 7777706 0357577 7 5 43 7-0 s2 Benefiual comments (recommcndations, additions, deletions) and any pertinent data which may bc of use in improving this document should be addrd to: Commander, U.S. Army Armament, Munitions, and Chemical Comrnand, Atta. AMSMGQA, Picatinny Arsenal, New Jers
2、ey 07806-5000 by using the seif-addressed Standardization Document Improvement Propmi (DD Form 1426) appearing at the end of this document or by letter. - MIL-C-70785(AR) 1 April 1989 MILITARY SPECIFICATION CARTRIDGE, 25MM, TARGET PRACTICE TRACER (TP-T) , M793 REFERENCE This specification is approve
3、d for use within the U.S. Army Armament, Munitions and Chemical Command, and is available for use by al1 Departments and Agencies of the Department of Defense. 1 SCOPE. 1.1 Scope. This specification covers requirements and quality assurance provisions for one type of percussion primed reference cart
4、ridge, designated as Cartridge, 25mm, TP-T, M793 to be used for calibrating acceptance testing equipment (see 6.1). 2. APPLICABLE DOCUMENTS. 2.1. Government documents. 2.1.3- Specifications, standards and handbooks. - The following sDecifications. stand-ards and handbooks form a part of this however
5、, light scratches not exposing base material may be permitted. All required marking and stamping shall be neat and clearly defined. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsiblity for inspection. Unless otherwise specified in the contract, the contractor is responsible for the performance of all i
6、nspection as specified herein. Except as otherwise specified in the contract, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of
7、 the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. Quality assurance terms and definitions shall be in accordance with MIL-STD-109 and the provisions of MIL-A-48078 shall apply. 4.1.1 Respons
8、iblity for compliance. All items must meet all requirements of sections 3 and 5. The inspection set forth in this specification shall become a part of the contractors overall inspection system or quality program. The absence of any inspection requirements in the specification shall not relieve the 4
9、 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-70785 33 = 9777706 0357603 7 = MIL-C-70785 (AR) contractor of the responsibility of assuring that all products or supplies submitted to the Government for acceptance comply with all requirements
10、of the contract. Sampling in quality conformance does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to acceptance of defective material. 4.2 Classification of inspection. The inspection requirements specifiei! herein are classifie
11、d as follows: Quality conformance inspection (see 4.3) 4.3 Quality conformance inspection. 4.3.1 Inspection lot formation. Inspection lots shall comply with the lot formation provisions of MIL-B-48078. 4.3.1.1 Component parts. Unless otherwise specified, component parts shall be homogeneous and of a
12、 quantity convenient to the contractor, except that each cartridge lot shall contain: a. Cartridge cases from one unchanged process, from one lot interfixed number, and one manufacturer. b. Primers from one lot, from-one lot interfixed number, and one manufacturer. c. Projectiles from one unchanged
13、process, from one lot interfixed number, and one manufacturer. d. Propellant from one lot and one manufacturer. e. All component parts shall meet the requirements specified in AS12013566. 4.3.1.2 Assembled cartrifige lot identification. Each lot of ammunition shall be identified as to type, caliber,
14、 and model, as well- as a lot number in accordance with MIL-STD-1168, supplemented as directed by the procuring activity. The entire lot of reference cartridges shall be assem5led and charged on a single loading machine. 4.3.2 Examination for defects. See MIL-A-48078. MIL-STD-651 shall apply in defi
15、ning and evaluating cartridge visual defects as applicable. a. Critical defects. Unless otherwise specified, one hundred percent examination shall be performed for all critical defects. If a visual critical defect is found in a sample either 5 Provided by IHSNot for ResaleNo reproduction or networki
16、ng permitted without license from IHS-,-,-MIL-C-70785 13 W 779970b 0357b02 7 MIL-C-70785 (AR) just prior to a firing test or after a firing test (and the defect is not due to the firing), the lot shall be rejected. The lot shall then be rescreened and resubmitted for visual inspection of critical de
17、fets. If a critical defect is found during packing, the portion of the lot that has been packed or is in the process of being packed shall be rejected. In addition, the portion of the lot remaining to be packed shall be rejected. The lot shall then be rescreened and resubmitted for visual inspection
18、 of critical defects. b. Major and minor defects shall be performed on a class basis in accordance with classification of defects using applicable sampling plans and acceptance criteria of MIL-STD-105. All nonconforming cartridges shall be rejected. The following AQLs are assigned to major and minor
19、 defects: Major . 0.25% Minor . 0.40% 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-dm o O0 2; SI rlrl H .e rlN O0 CVCV MIL-C-70785 13 W 7777706 0357603 O U ln 00 I- O I- I u I GI 2 rl rlrl id !45 Ern 5% Idid 77 rnrn .I+ .I+ 33 .rl 3 rl ti t rl r
20、i rlri ri m MM mm . .e In t v) dP O lnln O0 O mm ri 31 rl LI al Qc O LI a LI 2 -4 LI Qc a c 7 O m .rl Q ci m e 0 c .rl ci id a, W 2 .il LI pi al oi a .rl LI ci LI id u ai m Id u b L a h rn c O s ciLI Dl0 alo nPi 3s I-! M -Y Tv . . . * 8 8 5 p: O y E+d 7 Provided by IHSNot for ResaleNo reproduction o
21、r networking permitted without license from IHS-,-,-MIL-C-70785 13 W 999770b 0357604 2 W N ti ti ri iT N M d- d- . . . - E a B E $ E Y XI! W (L W .I I L O != c I U -K .r 3 h M a3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-n OB Z o F O E si o 3 8
22、 (u O ta P c E-i I pi I3 4 4 F! vi (u 4 a, tn 5 .rl ci .ci u 2 j“ c1 L* MIL-C-7075 13 W 9999906 0357605 4 W i . r! rlrlrl M OMM . o O00 -=3 * . . rsa O0 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-70785 13 = 77777Ob 0357bOb b r i3 n Y Y 8
23、 N 8 rl E fi Nrlrl III -loo rlm II ON 300 o O000 tY UNN o ww*w m ml cn I3 cn w B u H h cn H GI 2 a a, u m a, k !Y rn m a, k pi k B a, rl .I+ c, u a, -n O k pi a, 5: c, c, u a, pi II G .rl O W a, M 7 a, a rl rl rd c m c O c, u id LI c, X a, a, I-: -4 CI u a, .n O k pi k O 4-i a a, II 3 m a, tn u #ri
24、k u k m u a, -4 2 U a, c, O c 2 E u .t= 3 F m m Co S 3 3 v) a, u a a a, L O - 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-n ffi 4 U m Co b O i- l CJ I t, Y L Y n O MIL-C-70785 13 7777706 0357607 a3 -F rti . a O ri M a O O Cu II Provided by IHS
25、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-70785 13 777770b 0357b08 T MIL-C-70785 (AR) TABLE I. Firing defects Acc Cartridge : Misf ire Failure to chamber Failure to extract Projectile remaining inbore Primer : Primer leak Primer perforation Loose primer
26、 Blown primer Case : Longitudinal split - i/ H or S G or J K, L or rd Circumferential rupture, partial - i/ S, J or K G or L Circumferential rupture (complete) L/ Detached metal - 2/ Projectile: Rotating band separation 3/ Metal parts separation - 4/ Complete or partia separation 9 1 O O 10 4 O 4 1
27、O O O O 25 6 1 1 31 11 1 11 4 1 1 3 1 12 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-O O MIL-C-70785 13 m 7779706 0357607 L m MIL-C-70785 (AR) NOTES : i/ See Figure 1 for classifying splits and ruptures in fired cartridge cases. If a longitudinal
28、 split or circumferential rupture (partial) extends into two or more defined areas, only the most severe defect criterion of Table I for the areas involved shall apply. If a rupture results in separation of the cartridge case into two or more portions, the defects shall be classified as a complete c
29、ircumferential rupture. 2/ Metal sheared or missing from the fired cartridge case exterior, such as rim or neck shears, shall be classed as a defect. The lot shall not be penalized for shavings of metal from the interior wall of the case neck in the crimped area. 3/ For classification as a defect, t
30、here must be evidence either by recovery of the band, or portion thereof, or by hole(s) in the fragmentation screen(s). 4/ Separation or breakup of projectile part(s), as evidenced by recovering of part(s) or fragment(s) I or hole(s) in the target screen, shall be classed as a defect. Provided by IH
31、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-M MIL-C-70785 13 777770b 0357bLO MIL-C-70785 (AR) Splits Ruptures G-IN LINK GROOVE SECTION H-IN MOUTH OR NECK J-IN MAIN BODY SECTION, NO CLOSER THAN 1/4“ -TO EXTRACTOR GROOVE K-IN LOWER BODY SECTION FROM FORWARD EDGE
32、 OF EXTRACTOR GROOVE L-IN EXTRACTOR GROOVE M-IN CASE HEAD S-IN SHOULDER SECTION G-IN LINK GROOVE SECTION S-IN NECK AND SHOULDER J-IN UPPER 3/4 BODY SECT.ON K-IN LOWER 1/4 BODY SECTION ABOVE EXTRACTOR GROOVE L-IN HEAD AND EXTRACTION GROOVE FIGURE 1. Classification 25m of defects for case, cartridge,
33、14 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-70785 13 9997706 0357bLl T MIL-C-70785 (AR) 4.3.4 Testing. The tests listed in Quality Conformance Inspection shall be performed on each cartridge lot in accordance with the test methods prescr
34、ibed in 4.4. Unless otherwise indicated, tests shall be conducted with samples at 21 + 3OC. Sample size and acceptance criteria for each test shallbe as specified. Only cartridges having met the visual and dimensional requirements and having been selected in such a manner that the sample is represen
35、tative of the entire lot shall be used in the tests. The selected cartridges shall be thoroughly mixed before being divided into samples for the various tests. The combining of tests is permitted (see 6.4). 4.3.4.1 Firing defects and casualties. Firing defects and associated criteria shall be as spe
36、cified in Table I. For the defect definitions see AS12013566. 4.3.4.2 Unlisted firing defects. The lot shall be suspended and referred to the contracting officer for disposition, if a malfunction or casualty not covered by this specification occuring in any firing test, indicates that the product ma
37、y be unsuitable for the purpose intended. 4.3.5 Packaging, packing and marking inspection. MIL-STD-644 shall be used as a guide for inspection of packaging, packing and marking as applicable to Dwg. 12013674. perform examinations and tests prescribed herein shall conform to the provisions of MIL-A-
38、480 ?B. 4.3.6 Inspection equipment. Inspection equipment required to O 4.4 Methods of inspection. 4.4.1 Projectile extraction. The method shall be as prescribed in AS12013566. 4.4.2 Propellant contamination. The propellant from each of the cartridges will be examined visually for contamination, as p
39、rescribed in AS12013566. 4.4.3 Projectile torque. Each cartridge of the test sample shall be marked axially across the rotating band onto the case neck. Torque, to the specified requirement, shall be applied slowly to the projectile. Movement of the projectile with respect to the cartridge case dete
40、ctable by misalignment in the scratch mark, shall be recorded. 4.4.4 Velocity, pressure, and waterproofness. The methods of test shall be as prescribed in AS120l.3566. A total of three barrels shall be utilized for EPVAT testing. Ten (10) rounds shall be fired through each barrel on day one. An addi
41、tional ten 15 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-70785 23 W 779770b 0357622 2 W c MIL-C-70785 (AR) (10) rounds shall be fired through each barrrel on day two. The mean shall be summed for all groups. If these values fail to meet th
42、e applicable requirements, the lot shall be rejected. Statistics necessary for testing of results against acceptance criteria shall be computed (see 6.3). A correction factor of 0.46 mps per meter siiaLl be applied to the recorded velocity at the measured range to obtain muzzle velocity. The waterpr
43、oofness sample shall be fired from one test barrel only. 4.4.5 Dispersion. A total of three barrels shall be utilized for dispersion testing. Ten (10) rounds shall be fired through each barrel on day one. An additional ten (10) rounds shall be Eired through each barrel on day two. No discards will b
44、e allowed. All groups shall be pooled together for the final dispersion value. If this value fails to meet the requirements or dispersion, the lot shall be rejected. The measurement of targets shall be as prescribed in AS12013566. The range shall be 200 meters. 4.4.6 Actfon time. - The method of tes
45、t shall be as prescribed in AS1201356-6; 4.4.7 Projectile trace. - The method of test shall be as prescribed in AS12013566. Visual observation(s) or photographic witness of trace characteristics shall be made from suitable position(s). 4.4.8 Function and casualty. The method of tests shall be as pre
46、scribed in AS10213566. The Fgst sample shall be assembled in belts an3 fired in bursts or 25 + 5 rounds in a 25mm gun at a rate of 200 + 50 rounds per minute. The weapon barrel shall be at amSient-temperature at Seginning of test (see 4.3.4.1 and 4.3.4.2). 4.4.9 Defective weapon. The test barrel sha
47、ll be inspected prior to testtng. No Mann Barrel which has had more than 5000 rounds fired through it should be used. 4.5. In-process controls. 4.5.1 Propellant charge establishment. A total of thirty (30) cartridge shall be assembled with reference components and uti?izing the selected propellant l
48、ot. Ten (10) cartridges each shall be loaded with the nominal propellant charge weight, ten (10) cartridge shaJ.1- be loaded with one gram less than the nominal weight, and ten (10) cartridges shall be loaded with one gram more than the nominal weight. After conditioning the samples at 21 + 30C for
49、twelve (12) hours, the samples shall be tested for velocity, pressure and action. time using the EPVAT procedures. The charge sha3.1 be selected that meets the specified requirements of 3.4, 3.5 and 3.8. 16 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
