1、I I I 1 INCH-POTJND MIL-(2-71133 (AR) AMENDMENT 2 05 JUNE 1998 SUPERSEDING AMENDMENT 1 05 DECEMBER 1995 MILITARY SPECIFICATION CARTRIDGE, IGNITION, M985 LOADING, ASSEMBLING AND PACKING This amendment forms a part of MIL-C-71133 (AR), dated Armament Research, Development and Engineering Center, and i
2、s available for use by all Departments and Agencies of the Department of Defense. . 26 May 1992, and is approved for use by the U.S. Army PAGE 2 Delete: “INSPECTION EQUIPMENT DRAWINGS 9278622 - Envelope Drawing for Leak Testing of Ignition Cartridges“. PAGE 3 3.4.1, line 2: Delete: “8.85“ and substi
3、cute: tll.OOtt. 3.4.2, at end of sentence: Delete: “4.5.2.2“ and substitute: “4.5.2.1“ . 3.5: Delete in its entirety. PAGE 4 3.8: Delete in its entirety. 1 of 6 AMSC N/A FSC 1315 DISTFUBDTION STATEMEWT A. Approved for public release; distribution is mimited. Provided by IHSNot for ResaleNo reproduct
4、ion or networking permitted without license from IHS-,-,-MIL-C-71133 (AR) AMENDMENT 2 PAGE 7 TABLE I: Delete: “Static pressure (b) . 25 . 3.8 . 4.5.7“. PAGE 8 TABLE I, under Shell, Shotgun, Primed, 12 Gauge Assy.: Delete: “Sensitivity test . 20 (a) . 3.4.1/3.4.2 . 4.5.2“ and substitute: “Sensitivity
5、 test . 700 (a) . 3.4.1/3.4.2 . 4.5.2“. Delete: “Cartridge, Ignition, xM985 Assembly“ and substitute: “Cartridge, Ignition, M985 Assembly“. Delete “Leak test . 50 (b) . 3.5 . 4.5.3“. NOTES: Delete Note (a) in its entirety andsubstitute: “(a) Primers for the first article and be from the intended fir
6、st production lot and thereby negating the necessity of testing the primers from that production lot.“ PAGE 12 4.4.2.1, Critical 1: Delete in its entirety. Add Major 105 as follows: “105 Sensitivity non-function . (a) . 3.4.1 . . . Test/4.5.2“. PAGE 14 4.4.2.3, Major 104: Delete in its entirety. 2 P
7、rovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - MIL-C-3LL33 (2) 999990b 2073bLL b84 8 I MIL-C-71133 (AR) AMENDMENT 2 PAGE 16 4.4.3.2.1: Delete in its entirety and substitute: “4.4.3.2.1 Sensitivity test. Beginning with the first article (primers fo
8、r the first article can be from the intended first production lot, thereby negating the necessity of testing the primers from the first production lot), and from the first production lot produced, and continuing until three (3) consecutive lots have complied with 3.4.1 and 3.4.2, a sample of 700 pri
9、mers shall be selected and be subjected to this test. If the sum of the average critical height (H average) and five (5) times the .standard deviation(s) multiplied by the weight of the ball exceeds the maximum requirement, or if the sum of the average critical height (H average) less two (2)times t
10、he . standard deviation(s) multiplied by the weight of the ball exceeds the minimum requirement, the inspection lot shall be rejected. I 4.4.3.2.1.1: Delete in its entirety. PAGE 17 4.4.3.2.2: Delete in its entirety. 4.4.3.2.2.1: Delete in its entirety. PAGE 18 4.4.3.5: Delete in its entirety. PAGE
11、19 4.5.2.1: Delete in its entirety and substitute: “4.5.2.1 Sensitivity test. The sample of 700 primers shall be divided into 14 groups of 50 primers each and tested in the following manner: The first group (50) of primers shall be tested by dropping a steel ball 15/16 inch in diameter and weighing
12、1.94 + ounces on the firing pin of the test fixture from a height of nine (9) inches. (The height of drop shall be measured as the height from the top of the firing pin to the bottom of the ball.) The primers that fire, misfire, hangfire, or squib shall be recorded. successively increasing heights o
13、f one (1) inch, using a new group of 50 primers at each different height, until a height is reached at which all primers in the group being tested fire. .O2 This procedure shall be repeated at 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-C-7
14、LL33 (2) W 9999906 2033bL2 SI0 e MIL-C-71133 (AR) AMENDMENT 2 PAGE 19 (cont) The test fixture shall then be set to a height of eight (8) inches and the above procedure repeated at successively decreasing heights of one (1) inch, using a new group of 50 primers at each different height, until a heigh
15、t is reached at which all primers in the group being tested fail to fire. Acceptance or rejection of the lot shall be determined from calculations based on recorded data. The recorded test data shall be used in the calculation of “H average“ and ls“ as follows: H average = A plus B plus C S = I time
16、s the square root of L minus M where : A = the sum of Column 3. B = the first drop height at which all elements misfired. C = one-half the drop height decrement (absolute value). M = the square of the sum of Column 3. I = the drop height decrement (absolute value). 4.5.2.1.1: Tabulation of data. Div
17、ide a sheet of paper into columns and tabulate the data as follows: a. b. C. d. e. R Title Column 1 “Height of Drop“ and list all drop heights in consecutive order starting with the lowest height. DO NOT list the heights at which all elements fired or misf ired. Title Column 2 “Number of Failures“ a
18、nd list the sum of the number of elements that misfired, squibbed or hangfired at each intermediate height. Title Column 3 “Decimal Fraction of Elements Failing to Fire at Each Intermediate Height“ and record the decimal fraction that failed to fire at each intermediate height. This number is obtain
19、ed by dividing the value obtained under “Number of Failures“ by the number of elements tested at that height. Calculations shall be carried out and recorded to the nearest one-hundredth (.Oll. Title Column 4 “Standard Deviation Factor“ and list odd numerals in sequence, starting with 1, for as many
20、drop heights that are listed in Column 1. Title Column 5 “Standard Deviation Factor Times Fraction of Failures“ and, by multiplying each decimal fraction in Column 3 by the number on the same line in Column 4, enter the product on the corresponding line in Column 5. 4 Provided by IHSNot for ResaleNo
21、 reproduction or networking permitted without license from IHS-,-,-NIL-C-71133 (2) 999990b 2073bL3 457 MIL-C-71133 (AR) AMENDMENT 2 PAGE 19 (cont) 4.5.2.1.2 Procedures for solving equations. The procedures for solving the equations are as follows: a. To obtain “A“: Add the values in Column 3 and sub
22、stitute the sum for “A“. b. To obtain IB“: The first drop height at which all elements failed to fire and substitute the product for “B“. c. To obtain “Ci: Divide the drop height increment by 2 and substitute the dividend for IC“. d. To obtain “L“: Add the values in Column 5 and substitute the sum f
23、or IL“. e. To obtain “M“: Square the values in Column 3 and substitute the sum for “M“. f. To obtain “H average“: Add the values substituted for A, B, and C. g. To obtain si : Subtract the value substituted for “M“ from the value substituted for IL“ and the obtain the square root of the difference a
24、nd then multiply the square root by the height of the increment. h. Using the calculated values for “H average“ and isit, average“ plus 5 multiplied by the maximum weight of the ball is equal to or less than the maximum inch ounce energy required, and “H average“ minus 2 Is“ multiplied by the minimu
25、m weight of the ball is equal to or greater than the minimum energy value required, the lot is considered acceptable for sensitivity. if “H 4.5.2.1.3 Definitions. The following definitions apply to the non-function test. a. Inch ounces: The drop height in inches multiplied by the weight of the ball
26、in ounces. b. Failure: The following modes apply: (1) Misfire: A failure wherein initiation of the primer mixture does not occur. (2) Squib: A failure wherein a burning of the primer mixture occurs without detonation. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without lic
27、ense from IHS-,-,-MIL-C-71133 (AR) AMENDMENT 2 PAGE 19 (cont) (3) Hangfire: A failure wherein an audible delay occurs between the instant application of energy and the detonation report. I 4.5.2.2: Delete in its entirety. 4.5.3: Delete in its entirety. PAGE 20 4.5.5.a.: Delete the last sentence and
28、substitute: “The cartridges shall be fired at charge 3.“ * 4.5.5.b.: Delete last line in its entirety. PAGE 21 * 4.5.6.2: Delete last line in its entirety and substitute: “The means and standard deviations of the velocities at all firing temeratures shall be calculated using correted data.“ PAGE 22
29、4.5.7: Delete in its entirety. PAGE 25 Figure 1: Delete in its entirety. PAGE 26 Figure 2: Delete in its entirety. The margins of this amendment are marked with an asterisk or vertical line to indicate where changes (additions, modifications, corrections, deletions) from the previous amendment were
30、made. Government assumes no liability whatsoever for any inaccuracies 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. This was done as a convenience only and the Custodian : Army-AR Preparing activity: Army-AR (Project 1315-0202) 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
