1、MILITARY SPECIFICATION FOR MIM-85 12 2(A) b!#” neck, shoulder, body, or base (c) Flange cracks Failure to extracts including sheared rim Failure to chamber Gun stoppage (from ammunition defects not listed) Separation of metal parts of projectile assembly during flight: (a) Body Breakup (b) Loss of n
2、ose, fuze, or windshield (c) Complete rotating band separation (d) Partial rotating band separation with band seat knurling imprint detectable on band 8 Maximum allowable defective unit& O O 2 5 81 O O O 3 - 31 21 O O O O O O O i I t 1 Provided by IHSNot for ResaleNo reproduction or networking permi
3、tted without license from IHS-,-,-. TABLE L Maximum allowable firing defects per lot sample (continued), Defects (e) Partid. rotating band separation with bands, having no evidence of band seat knurling imprint: (1) Fragments having lengths no greater than 0.500 inch (2) Fragments having length grea
4、ter than 0.500 inch (3) Particles from normal band fringing or slivering Maximum allowable defective units- 3 O - 5/ - &/The number of defective units permitted pertain to the total number of cart- ridges fired as specified in Table II, except that primer leaks shall not be consi- ered defects for c
5、artridges fired in a single action. ?Unseated or upset primer buttons without indication of gas leakage are not considered as defective units. -Flange cracks, as determined by visual examination, shall not be cause for rejection of the lot but shall be recorded and reported. $Prior to firing a light
6、 application of oil or other lubricants, as required, may be applied to the cartridge case. ?/Lot will not be penalized. 3.6.1 Dro sensitivit HEI and API projectiles shall not deflagrate or function on impact + wit a steel plate at a velocity of 52 f5 ft/sec or a drop, nose down, from a &foot height
7、. 3.7 Identification and marking. The cartridges shall be identified and marked as specified on the applicable drawing. 3.8 Government-loaned property. The following gage will be Government- loaned property: 20 MM Cartridge MARK 5 MOD O Assembled Ammunition Gage (Drawing 1314850). 9 Provided by IHSN
8、ot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4 MIL-C-85122 13 999940b 0363885 O i! 3.9 Workmanship. The cartridges shall be assembled utilizing good workman- ship practices common to the ordnance industry. Particular care shall be taken that ail components are cl
9、ean, free from grease, dirt, corrosion, chips and foreign material. Components with obvious defects or handling damage that could affect performance of the cartridge or test weapon shall not be assembled. 3.9.1 Special working conditions. Facilities used in the manufacture, testing, and inspection o
10、f cartridges shall meet the minimum standards for working con- dit ions of MIL-STD-1695. 3.10 Ammunition data cards -Ammunition data cards (DD Form 1650) shall be completed in accordance with MIL-STD-1167 for each lot of cartridges (see 6.2.2). An ammunition data card shall be placed on top of the c
11、ontents of each am munition box, 4. QUALITY ASSURANCE PROVISIONS. 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspec- tion requirements as specified herein. Except as otherwise specified in
12、the con- tract or purchase order, 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 the inspections set forth in this specifica
13、tion where such inspec- tions are deemed necessary to assure that supplies and services conform to pre- scribed requirements. * 4.1.1 Special working environment. To meet the requirements of 3.9.1, the contractor shall provide adequate facilities for the fabrication, assembly, and testing of supplie
14、s to be delivered in accordance with this specification. 4.2 Classification of inspections. inspection requirements specified herein are classified as follows: (a) (b) First article inspections (see 4.4). Quality conformance inspections (see 4.5). (1) Individual. inspections. (2) Sampling inspection
15、s. -*. , 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIM-85 12 2(AS) 4.3 Inspection provisions and conditions. All firing inspections (tests) shall be accomplished at the testing activity specified in contract or purchase order (see 6.2.1). 4.
16、3.1 Inspection equipment. Unless otherwise specified in the contract or pur- chase order (see 6.2.11, all inspection equipment shall be supplied and maintained by the contractor in accordance with MIL-1-45607. 4.4 First articio inspection. The 1,250 first article samples (see 3.2) shall be subjected
17、 to the examinations and tests of Table II. Failure of any cartridge to meet the requirements specified herein shall be cause for rejection of the first article samples. 4.5 Quality conformance inspection. The quality conformance sample shall be subjected to the examinations and tests of Table II. 4
18、.5.1 Production lot. The production lot shall be not less than 20,000 cartridges and not more than 50,000 cartridges. The lot shall consist of the following: (a) Projectiles from one lot. (b) Cartridge cases from one lot. (cl Primers from one lot. (d) Propellant from one index. (e) Tracers from one
19、lot. , (f) Fuzes from one lot. 4.5.1.1 Mixed component lot. When the lot size has been established, all com- ponents that are left over me to be retained until a sufficient number is accumu- lated for a mixed lot of 20,000 to 50,000 Cartridges. The accumulated leftovers of propellant shall not be us
20、ed in mixed component lots unless blended by a method acceptable to the procuring activity as determined by the Government representa- tive, with a charge determination made for its assembly into the cartridges. The blending method shall be made available for review by the Government representa- tiv
21、e. Mixed components shall not be used without prior approval of the procuring activity. The ammunition data card shall contain information on all lots of com- ponents used. 4.5.1.2 Lot identification. Each cartridge and each packed cartridge lot shall be identified in accordance with applicable draw
22、ings and MIL-STD-1168, supple- mented as directed by the procuring activity (see 6.2.1). 11 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- L, _I_I_ - MIL-C-85122 13 7777906 O363887 4 - _- TABLE II. First article and quality conformance inspection.
23、Test or examination Group I Visual and mechanical Cer tif ication Gaging- 21 Proiec tile extraction- 2/ - 21 il 51 . Group II- Velocity-pressure Waterproof velocity Action time 6/ Accuracy firing Function and casualty- Group III- 2/ $/ High pressure (HPT) Low pressure (LPT) Safety (HEI, API, APT) Dr
24、op sensitivity (HEI, API) Incendiary performance ( API) ”racer functioning (APT) High explosive incendiary (HEI 1 Group IV Preparation for delivery Quantity i/ All- All All 50- 31 25 20 20 20 300 25 25 20 10 20 20 20 Requirement 3.3, 3.7 and 3.9 3.3 and 3.4.1.2 3.3 3.4.3.1 3.5.1.1 3.5.1.2 3.5.1.3 3.
25、5.1.4 3.5.1.5 3.5.2 3.5.3 3.6 3.6.1 3.5.4 3.5.5 3.5.6 Section 5 Test 4.6.1 4.6.1.1 and 4.6.1.2 . 4.6.1.3 4.6.1.4 4.6.2.1 4.6.2.2 4.6.2.3 4,6.2.4 4.6.2.5 and 4.6.2.5.1 4.6.2.6 4.6.2 6 4.6.3 4.6.3.1 4.6.2.7 4.6.2.8 4.6.2.9 4.7 LI1Allff means that all cartridges covered by this specification will be su
26、bjected -Test not required for FCT cartridge (DL 2051583). 3/guantity of 50 cartridges is for first article tests only, use Table III for quan- STest not required for dummy cartridge (DL 2605723). ?Not required for HPT and LPT cartridges. -Test sample shall be-equally divided for firing in both MARK
27、 11 and MARK ZAssembled projectiles only to be furnished in this sample. Additional com- to this test. The designation of a particular type (API, HEI, etc.) in Group III means that the test is for that type of cartridge only. tity of cartridges for quality conformance tests (except HPT and LPT). 12
28、guns. ponents will be supplied by the testing activity. 12 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-i MIL-C-85122 13 = 77777Ob 0363888 b 4.5.2 Individual inspections. The individual inspe.ctions of Table II, Group I, shall be performed prior t
29、o the sampling tests. Failure to meet the specified requirements shall be cause for rejecting any cartridges from the lot. 4.5.3 Lot sampling. Upon completion of the individual inspections and the projectile extraction tests, 500 sample cartridges shall be randomly selected from the inspection lot (
30、using the sampling methods of MIL-STD-105) for ballistic tests in accordance with AD-1324. Failure of any sample to meet the requirements specified herein shall be cause for lot rejection. 4.5.4 Control cartridges. In addition to the sample specified in 4.5.3, the con- tractor shall deliver from the
31、 same component lots that comprise the cartridge lot being tested 40 cartridge cases and primers, 40 projectiles, and sufficient propellant for 40 control cartridges (see 6.2.1) to the testing activity with each lot of cartridges delivered. . . 4.6 Inspection methods. 4.6.1 Visual and mechanical. Th
32、e cartridge shall be visually and mechanically inspected for conformance to the drawings (see 3.31, identification and marking (see 3.7), and workmanship (see 3.9). 4.6.1.1 Certification. The contractor shall have available for the Government representative written certification accompanied by objec
33、tive quality evidence (as defined in MIL-STD-109) that the components used as a part of the cartridge meet the requirements specified herein. 4.6.1.2 Primer resistance. The electrical resistance between the primer con- tact button and the cartridge case of each prime3 cartridge case shall be mea- *
34、sured, using an approved resistance measuring instrument (with maximum limits of 5.0 milliamperes and 7.5 millivolts) after the crimping operation and prior to waterproofing and propellant loading. Primer resistance shall be certified by the contractor and shall meet the requirements of 3.4.1.2. 4.6
35、.1.3 Gaging. Each cartridge shall be mechanically inspected with the assem- bled ammunition gage (see 3.8). Failure to enter the gage, within specified toler- ances, shall be cause for rejecting any cartridge from the lot. from the inspection lot and tested in an approved tensile strength machine. T
36、he machine shall apply force at a controlled rate of 0.125 to 0.250 inch per minute of test head travel. The force required to extract the projectile from the crimped cartridge case shall meet the requirements of 3.4.3.1 in accordance with the double sampling plan defined in MIL-STD-105 and shown in
37、 Table III. 4.6.1.4 Projectile extraction. Fifty sample cartridges shall be randomly selected 13 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TABLE III. Projectile extraction sample. -Sample Cumulative Accept Reject size size defect ives defect iv
38、es Sample 1s t 50 50 O 2 2nd 166 150 1 2 i 4.6.2 Ballistic tests. Sample cartridges shall be fired as specified in the detailed test and range procedures of AD-1324. 4.6.2.1 Velocit ressure. Twenty-five sample cartridges and 10 control cart- ridges (see -F- 4.5.4 shall be temperature conditioned fro
39、m 680F to 72F for a minimum of 2 hours and tested as follows: The first five sample cartridges fired from the test barrel shall be considered warming cartridges. Ten control cartridges loaded by the testing activity shall be inter- spersed with the last 20 sample cartridges. The remaining 20 sample
40、cartridges and the 10 interspersed control cartridges will then be fired from the pressure barrel (Drawings SK 679810 or SK 679811). Peak chamber pressures of the sample cartridges, as determined from the tarage table of the copper crusher cylinder lot or piezoelec- tric pressure transducers, will b
41、e averaged as groups for use in com- puting the average corrected peak pressure. (The 20 sample cart- ridges as one group and 10 control cartridges as another group.) Average pressure for the sample cartridges will be corrected for condition of the barrel by the following formula: P = P1+(P2-P3) whe
42、re: = Corrected peak pressure of the sample cartridges. Pl = Average peak pressures measured for the 20 sample cartridges. 14 . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-P2 = P3 = Assessed pressure of the control cartridges. Average pressure of
43、 the 10 control cartridges measured in the pressure barrel. ! Average corrected peak pressure and average corrected velocity shall meet the requirements of 3.5.1.1. Average corrected velocity shall be computed as follows: where: = The average corrected velocity for the sample cartridges. VI = Averag
44、e velocity measured from the 20 sample cartridges. V2 V3 = Average velocity measured from the 10 control cartridges. = Assigned velocity for the propellant used in the control cartridges. 4.6.2.2 Waterproof velocity. Twenty sample cartridges shall be submerged in water at 68F to 72F for not less tha
45、n 24 hours. Upon removal from the water, the sample cartridges and 10 control cartridges shall be fired from the same test weapon. The average corrected velocity shall be computed using the formula specified in 4.6.2.1 and shall meet the requirements of 3.5.1.2. . 4.6.2.3 Action time. Twenty sample
46、cartridges shall be submerged in water for 24 howmed in 4.6.2.2. Upon removal from the water, the sample cartridges shall be single-action fired from the test weapon. The average car- tridge action time shall be determined for the cartridges. Average and individual cartridge action times shall meet
47、the requirements of 3.5.1.3. NOTE: This test may be performed concurrently with 4.6.2.2. 4.6.2.4 Accuracy firing. Two groups of 10 cartridges each shall be fired to determine the average dispersion from the test weapon at a vertical target placed at a distance of 500 yards. Three warming rounds shal
48、l be fired prior to the test. Each group of 10 cartridges shall then be fired, at a uniform rate, to determine 15 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-the vertical and horizontal impact patterns on the target. The average dispersion patter
49、n shall be computed as follows: where: II D Dl D2 Dg D4 4 = Average dispersion pattern in inches. = The longest vertical distance in inches between any 2 impacts from the first group of 10 cartridges fired. = The longest horizontal distance in inches between any 2 impacts from the first group of 10 cartridges fired. = The longest vertical distance in inches between any 2 impacts from the sec
