MIL-DTL-60553D
identified on the x-ray negative. Defective cartridges, found by the vendor, shall be clearly identified on
the negative and those defectives removed from the production lot. The serial numbers shall be pen or ink
stamped on the cartridge with approximately 1/8-inch-high characters. The serial numbers shall be located
apart from the other cartridge markings (see 6.2).
4.7.5 Leak test. Each cartridge shall be subjected to specified pressure differential. The method for
determining leakage shall be with a helium mass spectrometer. The helium leak rate shall be converted to
standard cubic inches air. Failure to comply with the requirements of 3.3.2 shall be cause for rejection of
the cartridge.
4.7.6 Vibration test. Twelve of the 21 assembled cartridges of the first article sample, x-rayed as directed
in 4.7.4, properly identified, shall be subjected to vibration. The method and procedures for performing
the vibration test shall be in accordance with MIL-STD-810, Method 514.3, Test Procedure I, Test
Condition I-3.2.5 (see 6.2). Then the 12 vibrated cartridges shall be x-rayed again. Evidence of any
disintegration of the ignition device, propellant, or igniter, or derangement of any component shall be
cause for rejection of the sample.
4.7.7 Functional. The following tests shall be performed by the Government.
4.7.7.1 Ignition device sens itivity. A quantity of cartridges, in accordance with table II, void of delay
charge igniter and propellant, from the first article sample and each subsequent lot shall be tested for
sensitivity. In the event loaded cartridges are selected for test, remove and discard all powder charges
from the test cartridge by sectioning the cartridge case around the periphery, 1 inch maximum above the
base. Drop test at 13 inches (adjusted) using a steel ball 15/16-inch in diameter, weighing 1.94 ± 0.02
ounces, in a ignition device sensitivity machine with a cartridge holder approved by the acquiring agency.
The height of 13 inches shall be adjusted taking into consideration the actual weight of the ball so that the
energy level specified in 3.6.1 is achieved. Failure of the sample to comply with the requirements of 3.6.1
shall be cause for rejection of the sample or the lot.
4.7.7.2 Ballistics
4.7.7.2.1 First article. Twenty-one cartridges of the first article sample shall be grouped and temperature
conditioned as described in table III and 4.8. Following removal from the conditioning chamber, the
cartridge shall be tested as required by 3.6.2.2. Failure of a cartridge to comply with the requirements of
3.6.2.2 shall be cause for sample rejection.
4.7.7.2.2 Production lot acceptance. Twenty-one assembled cartridges from each production lot shall be
divided into three equal groups, temperature conditioned, and fired in accordance with 3.6.2.2. If the
sample is not evenly divisible by three, the remaining cartridges will be tested at -60 and 205 °F. Failure
of a cartridge to comply with 3.6.2.2 shall be cause for rejection of the lot. In addition to the sample of
cartridges for the above test, 10 additional cartridges shall be furnished from each production lot for
investigative purposes.
4.7.7.3 Retest. There shall be no retests.
4.7.7.3.1 Test failure. If a test failure is attributable to an assignable cause, excluding the test cartridge,
the original test results shall be discarded and that test reconducted.
10
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business