1、 MIL-P-46458F (3) 13 7777706 0423743 4 1 INCH-POUND MIL-P-46458F(AR) AMENDMENT 3 SUPERSEDING AMENDMENT 2 27 Sept 1984 March 20, 1990 MILITARY SPECIFICATION PROPELLANT 30 FOR USE IN CARTRIDGE, 105MM, HEAT-T, M456A1 HEAT-T-MP, M456AlE2 AND TP-T, M490 This amendment forms a part of Military Specificat
2、ion MIL-P-46458F (AR) dated 29 January 1980, and is approved for use by the US Army Armament, Munitions and Chemical Command and is available for use by all Departments and Agencies of the Department of Defense. PAGE 1 Title: Add i1(M456A2)11 after the designation M456AlE2. 1.1, Line 2: Insert 11(M4
3、56A2)11 after M456AlE2. PAGE 2 2.1, Drawings: Change I1M456A1E2l1 to 11M456A211. PAGE 3 3.2: Delete in its entirety and substitute: “3.2 Ballistic assessment requirements. The propellant when fired in the M68 Gun with the M490, M456A1 or M456A2 projectile shall comply with the following requirements
4、 at 70 degrees Fahrenheit (degrees F) (see 4.5.1) and standard weapon conditions. 3.2.1 Velocity. The propellant shall be capable of assessment to a velocity of 3850 feet per second (fps). 3.2.2: Delete in its entirety and substitute: AMSC N/A 1 of 3 FSC 1376 DISTRIBUTION STATEMENT A. Approved for p
5、ublic release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-4b458F (3) 13 77797Ob 0923949 b MIL-P-46458F (AR) AMENDMENT 3 “3.2.2 Pressure. The expected average pressure shall not exceed 59,500 pounds per square inc
6、h (psi) for M490, M456A1, nor M456A2.“ 3.2.3 Charge weight. The calculated charge weight shall not exceed 199 ounces.I1 3.3, Insert 11(M456A2)11 after M456AlE2. 3.3.2: Delete in its entirety and substitute: “3.3.2 Average pressure. At 70 degrees F and standard weapon conditions, the propellant shall
7、 not produce an average pressure greater than 59,500 psi for M490, M456A1 nor M456A2. At 125 degrees F standard weapon conditions, the propellant shall not produce an average pressure greater than 68,600 psi when fired with any of the projectiles.“ PAGE 7 TABLE I: Delete in its entirety and substitu
8、te the following Table I. % TABLE I: Delete 1158700vv and substitute 915950011. TABLE I - PROVING GROUND SUMMARY TEST SAMPLE VE LOCI TY PRESSURE PHASE TEMP SIZE REQUIREMENTS REQUIREMENTS - I Degrees Cal Test Service Std Dev of F Velocity Velocity IMP Average (fps) (fps) (psi) (psi)- CHG i* ESTAB 70
9、39 3852 INFO INFO UNIF -50“ N/A 10 INFO INFO INFO INFO INFO i* 10 10 3850 7. II * 70 125 N/A 10 INFO INFO 73900 145* N/A 10 - INFO INFO INFO INFO - * Performed for initial production testing only. * The average pressure plus three (3) standard deviations shall not exceed the IMP (see 3.3.3). P - B _
10、f * The maximum average pressure is 58700 for the M490 and M456A1 projectiles and 59500 for the M456A2. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-P-4645F (3) 13 W 7979906 CIL123745 = MIL-P-46458F (AR) AMENDMENT 3 PAtiE 9 4.5.1.4.b, Dele
11、te everything after 25 Ips. PAGE 10 4.5.4, Insert 11(M456A2)11 after M456AlE2. The margins of this amendment are marked with an asterisk or vertical lines to indicate where changes (additions, modifications, corrections, deletions) from the previous amendment were made. This was done as a convenienc
12、e only, and the Government assumes no liability whatsoever for any inaccyracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous amendment. Custodians : Army-AR Preparing ac tiv i ty : Army-AR - (Project 1376-A3781 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
