1、MIL-C-85624 13 H 9999906 0365465 T H MIL-C-85624 (AS) 6 July i983 MILITARY SPECIFICATION CARTRIDGE, 25 MILLIMETER, PGU-2O/U (API) This specification is approved for use by the Naval Air Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Departmen
2、t of Defense. 1. SCOPE 1.1 Scope. This specification establishes the requirements for the manufacture and acceptance of the Cartridge, 25 Millimeter (mm), PGU-2O/U Armor Piercing Incendiary (API), herein referred to as the Cartridge. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specificat
3、ions, standards, and handbooks. The following specifi- cations and standards, of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DoDISS) specified in the solicitation, form a part of this specification to the extent specified herein. SPECIFICATIONS
4、MILITARY MIL-A-12560 Armor Plate, Wrought, Homogeneous (For Use in and For Combat Vehicles Ammunition Testing). Beneficial comments (recommendations, additions, deletions) and any per- tinent data which may be of use in improving this document should be addressed to Commanding Officer, Naval Air Eng
5、ineering Center, Engineer- ing Specifications and Standards Departments (ESSD), Code 93, Lakehurst, NJ 08733, by using the self-addressed Standardization Document Improve- ment Proposal (DD Form 1426) appearing at the end of this document, or by letter. . IFSC 13051 I THIS DOCUMENT CONTAIN3 PAGES. I
6、 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-C-5624 13 W 7779706 03651166 I W I ! i STANDARDS MILITARY MIL-STD-105 MIL-STD-129 MIL-STD-644 MIL-STD-810 MIL-STD-1167 MIL-STD-1168 MIL-STD-12 35 Sampling Procedures and Tables for Inspection by A
7、ttributes. Marking for Shipment and Storage. Visual Inspection Standard and Inspec- tion Procedures for Inspection of Packaging, Packing and Marking of Small Arms Ammunition. Environmental Test Methods. Ammunition Data Card. Lot Numbering of Ammunition. Single and Multilevel Continuous Sampling Proc
8、edures and Tables for Inspection by Attributes. 2.1.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this specification to the extent specified herein. OTHER GOVERNMENT DOCUMENTS U.S. Army Material Command A
9、MCR 715-505 DRAWINGS Naval Air Systems Command (Code Ident 30003) 1395AS125 13 9 5AS160 139 7AS19 O 139 7AS 39 O Ammunition Ballistic Acceptance List Methods, Volume 8, Test Procedures for 20 mm Cartridges. Gun, Automatic, 25 mm (GAU-l2/U). Cartridge-Gun Interface, 25 mm. Cartridge, 25 mm, API, PGU-
10、2O/U. Cartridge, 25 mm, TP, PGU-23/U. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-5624 13 W 9999906 0365i.lb7 3 W MIL-C- 85 6 24 (AS) PUBLICATIONS Code of Federal Regulations 49 CFR 100-199 Hazardous Materials Regulations, Depart- ment of T
11、ransportation. (Applications for copies should be addressed to the Superintendent of Documents, Government Prdnting Office, Washington, DC 20402) REPORTS BAL TR No. 66 Resistance of Steel Targets to Perfor- ation by Small Caliber Armor Piercing Projectiles. (Copies of specifications, standards, hand
12、books, drawings, and publica- tions required by manufacturers in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer.) 2.2 Order of precedence. In the event of a conflict between the text of this specification and
13、references cited herein, the text of this speci- fication shall take precedence. 3. REQUIREMENTS 3.1 General. The cartridge shall comply with Drawing 1397AS190 and other requirements specified herein. 3.2 Characteristics. 3.2.1 Performance. 3.2.1.1 Chamber pressure. The average plus three standard d
14、eviations of the peak chamber pressure shall be not greater than 425 magapascals (MPa) at 21 f3 degrees Celsius (OC). of peak chamber pressure shall be not greater than 476 MPa when functioning at any individual temperature between -54 and 71OC. The average plus three standard deviations 3.2.1.2 Act
15、ion time. The time between firing-pin contact with the primer and exit of the projectile from the muzzle shall be not greater than 6.0 milliseconds (ms) at any cartridge temperature from -54 to 71OC. 3 , Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
16、,-MIL-C-85624 13 7977706 03bCLI68 5 MIL-C-85624 (AS) 3.2.1.3 Velocity. The average projectile muzzle velocity of cartridges conditioned at 21 k3OC shall be a minimum of 1,000 meters per second (m/s). The standard deviation shall be a maximum of 10 m/s. temperature from -54 to 7loC, the projectile mu
17、zzle velocity shall be greater than 950 m/s. At any cartridge 3.2.1.4 Accuracy. The impact dispersion of the projectiles shall be such that the standard deviation of the impact points about the mean impact point shall be not greater than 0.7 milliradians when fired in the single-shot test barrel at
18、21 k3OC. 3.2.1.5 Pro jectie extraction. The force required to extract the pro- jectile from the case shall be not less than of 8,000 newtons (N) and not greater than 16,900 N. 3.2.1.6 Projectile torque. The projectile shall not rotate in the case when subjected to a torque of 3.4 newton meters (Nm).
19、 3.2.1.7 Penetration. The projectile shall exhibit a Probable Ballistic Limit (PBL) Velocity of not greater than 950 meters per second (m/s) when fired against 38.1 mm of armor (conforming to MIL-S-12560) at an obliquity of 45 degrees to the flight path of the projectile. 3.2.1.8 Structural integrit
20、y. The .cartridge shall be structurally compatible with the GAU-12h.J gun, Drawing 1395AS125. of the projectile shall remain intact while in the gun and during flight. When fired, all parts 3.2.1.9 Waterproofness. The mean velocity (wet) of the cartridge shall not vary from the mean velocity (dry) b
21、y more than 30 m/s when tested at 21C. The action time -shall meet the requirements of 3.2.1.2. 3.2.1.10 Function and casuality. The cartridge shall function in the AV-8/25 mm Gun System, without any firing defects as specified in Table I. i/ Table I. Firing defect. - I Item I Defect I AQL Cartridge
22、 Premature Fire L/ Hangfire A/ Misfire A/ Failure to chamber ?/ Failure to extracto Projectile remains in bore z/ 0.065 0.065 O. 065 O. 065 O. 065 0.065 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-85624 13 7777706 0365467 7 Cartridge Case
23、 I Table I. Firing defect. - (Continued) Split or rupture (mouth, neck, shoulder) =/ 0.65 Split or rupture (main body) G/ 0.40 Split or rupture (base area) %/ 0.065 Complete rupture G/ O. 065 Detached metalu/ O. 250 I item I Defect I AQL Primer Pierced primer 8/ BOW primer x/- Primer leak u/ Loose p
24、rimer z/ O. 65 0.40 O. 40 0.65 Parts separation and integrity a/ Rotating band separation =/ Projectile Yaw =/ 0.065 O. 25 1.0 Table I Notes: - i/ These defects apply only to cartridges fired in the approved test fixture. Unless otherwise specified herein, firing defects shall be as defined in AMCR
25、715-505, Volume 8, Chapter 1, Section 3. The AQLs are from Table V and Table III. - 2/ Premature fire. The cartridge functions prior to insertion in the chamber of the test fixture or gun. - 3/ Hangfire. An action time in excess of 6 ms. - 4/ Misfire. If a misfire occurs, a second firing-pin impact
26、is not allowed unless a light firing-pin impact is confirmed by inspection. The cartridge configuration and firing condi- tions shall be recorded, and the cartridge and record submitted to failure analysis as defined by the contractor. Disposition of the lot shall be dependent upon results of the fa
27、ilure analysis. The failure analysis shall determine which of the following two misfire conditions apply: a. Misfire due to primer failure. A primer misfire is defined as a normally chambered cartridge in which the primer fails to fire upon application of the prescribed energy to the primer. the pro
28、curing activity shall be notified and the lot accepted by the procuring activity (see 6.2.2). The failure shall be recorded and Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-C-85624 13 7777706 0365470 3 - Table I Notes: (Continued) b. Misfire n
29、ot due to primer. defined as a normally chambered cartridge in which the pro- pellant does not ignite when the primer fires normally. Disposition of the lot will be as specified in the contract or purchase order (see 6.2.1). A non-primer caused misfire is - 5/ Failure to chamber. The cartridge canno
30、t be inserted into the chamber a sufficient distance to allow the breech to be engaged. - 6/ Failure to extract. The fired case can not be removed from the test weapon chamber by normal means. - 7/ Projectile remains in bore. of the test weapon after firing. The projectile remains in the bore - 8/ P
31、ierced primer. The cartridge case shall be visually examined. A pierced primer is one in which the indentation in the primer cup, made by the firing pin, is entirely perforated. identified by a visual hole through the primer, or if the per- foration is minute, by discoloration of the indentation cau
32、sed by burning gases. It is - 9/ Blown primer. The cartridge case shall be visually examined. A blown primer is a primer that when the cartridge is fired, is separated completely from the head of the cartridge case, and both the head of the case and the primer pocket are enlarged and deformed. - 10/
33、 Primer leak. Primer leaks are defined as follows: a. Primer leak, minor. Discoloration caused by gas leakage around the junction between the primer cup and primer pocket wall encompassing 180 degrees or more of the periphery. condition is observed; however, this condition shall be recorded. the sam
34、ple shall be cause for investigation and corrective action. It shall not be cause for lot rejection. b. Primer leak, major. Visual evidence of metal erosion The lot shall not be penalized if this An occurrence rate of more than 10 percent of around the primer cup and primer pocket periphery that res
35、ults in automatic gun system damage of such severity that it would cause a subsequent system malfunction. - il/ Loose primer. A looseness that permits the fired primer to fail from the primer pocket after the cartridge has been fired without distortion of the primer pocket. shall be visually examine
36、d. The cartridge case Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-LLY Table I Notes: (Continued) Cartr-dge case spl split or rupture t direction. t or rupture (mouth, neck, shoulder). A st exceeds five millimeter (mm) in any Cartridge case split
37、or rupture (main body). that exceeds five mm in any direction. A split or rupture Cartridge case split or rupture (base area). of any size in the base area not including primer leaks. base area is the area of the case not supported by the chamber. A split or rupture The Complete rupture. A separatio
38、n of the cartridge case into two or more portions. Detached metal. Metal sheared or missing from the fired cart- ridge 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 ar
39、ea. Parts separation and integrity. A separation of the windscreen from the projectile or a projectile breakup shall be classed as a defect. Rotating band separation. band from the projectile shall be classed as a defect. band fragments having a length less than 10 mm are acceptable providing the ba
40、nd seat serration imprints are not visible. A separation of a complete rotating Rotating Projectile yaw. as determined by yaw/witness cards or a missed target during lot acceptance test. and Table II (when required) shall be monitored. Defined as yaw angle greater than 15 degrees All functional test
41、s specified in Table I 3.2.2 Environmental conditions. The cartridge shall meet the perform- ance requirements of this specification after having been subjected to the environments specified in 3.2.2.1 through 3.2.2.3. 3.2.2.1 Temperature shock. The cartridge shall meet the performance requirements
42、of this specification after exposure to the temperature shock specified in MIL-STD-810, Method 503, Procedure I. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Table II. First article inspection. First Article Sampling No. I II III IV V VI VI1 VI1
43、1 IX X XI Test Projectile extraction Propellant weight - i/ Projectile torque Waterproofness - 2/ Pressure -54, 71OC ?/, A/ Pressure 2iC 31 Velocity -54, ti0c A/, i/ Velocity 2i0C 31 Action Time -54, 7loCA/, i/ Action Time 2loC A/ Single-shot accuracy - 51 Salt fog - 61 Temperature shock - 61 Temper
44、ature, humidity - 6/ and altitude Penetration L/ Structural integrity - 8/ Function and casualty - 8/ Table II Notes: Sample Size 50 50 20 50 50 50 50 50 50 50 50 50 50 50 30 Tests III thru X 1,500 Requirement 3.2.1.5 3.3.2.2 3.2.1.6 3.2.1.9 -3i2.1.1 3.2.1.1 3.2.1.3 3.2.1.3 3.2.1.2 3.2.1.2 3.2.1.4 3
45、.2.2.3 3.2.2.1 3.2.2.2 3.2.1.7 3.2.1.8 3.2.1.10 Test 4.3.1.5 4.3.1.10 4.3.1.6 4.3.1.9 4.3.1.1 4.3.1.1 4.3.1.3 4.3.1.3 4.3.1.2 4.3.1.2 4.3.1.4 4.3.1.12.3 4.3.1.12.1 4.3.1.12.2 4.3.1.7 4.3.1.8 4.3.1.11.1 - l/ The propellant shall be visually examined for contamination as specified in AMCR 715-505, Vol
46、ume 8, and the propellant weight determined. - 2/ The waterproofness sample shall be tested in the single-shot barrel at 21OC. immersion in water. The cartridge weight shall be recorded before and after - 31 The samples for pressure, velocity and action time at -54, 21, and 71OC may be combined. 8 P
47、rovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-C-85629 13 M 7977906 0365L173 7 I Acceptable Quality Levels Test Descrip- Sample Number tion Size O. 065 O. 25 O. 40 O. 65 1.0 Acc/Rej Acc/Rej Acc/Rej Acc/Rej Acc/Rej 1 - 8 Single 350 011 213 4/5 61
48、7 819 shot 9 Burst 1500 011 516 819 . 13/14 20/21 firing Table II Notes: (Continued) - 4/ A sample size of 25 cartridges shall be used at both -54 and 71OC. - 51 The test sample for single-shot accuracy may be combined with the pressure, velocity and action time samples at 21OC. - 6/ The salt fog, t
49、emperature-humidity-altitude and temperature shock samples shall be tested in the single-shot barrel at 2loC. - 71 Two PBLs shall be measured. included in structural integrity testing. Firing defects and associated criteria are specified in Table I, The accept/reject criteria shall be as specified in Table III-. Penetration test rounds are not - 8/ Table III. Preproduction test function
