MIL-T-466928
4.2.3.3.1 Ballistics. Twenty-one units shall be tested to determine compliance with 3.7. The units shall be temperature conditioned as provided in table II and 4.3.4.2. Failure of any unit to comply with 3.7.1 through 3.7.9 shall be cause for rejection of the lot.
TA8LE II. Conditioning temperature.
Sample size |
Method |
Temperature (EF) |
7 7 7 |
Load (see 3.7.1) Load (see 3.7.1) Load (see 3.7.1) |
!65 to !70 65 to 75 195 to 205 |
4.2.3.3.2 Retest. There shall be no retests.
4.2.3.3.3 Test failure. If a test failure is attributable to an assignable cause, excluding the test thruster, the original test results shall be discarded and that test reconducted.
4.3 Test methods and procedures.
4.3.1 Breakaway torque. A torque wrench, set at the torque requirements specified in table I,shall beused withanappropriateadapter todeterminetheadequacyofthe joint. The cylinder shall be held secure and the torque shall be applied to the head.
4.3.2 Residual magnetism. The assembly shall be tested for excessive residual magnetism using an approved compass in an area free of local magnetic effects by placing the assembly 5 inches from the end at the same height as the compass, in the north-south horizontal position (head endatsouth)withthecompasssetinaneast-westheading. Theassemblyshallbemovedata speed no greater than 10 feet per minute past the compass for its entire length, rotated 90 degrees in the horizontal position about its longitudinal axis, and moved slowly back past the compass. This
procedure shall be repeated for each 90 degree rotation of the assembly for four full passes.
4.3.3 Radiographic examination. Allassembledthrustersshall beradiographically examined in accordance with MIL-STD-453, with the exception that an thruster assembly will be used for the penetrameter. Any observable imperfections in components or assembly shall be cause for rejection. The thrusters shall be positioned for the most revealing exposure, with the long axis of each assembly perpendicular to the rays of the X-ray machine. All thrusters shall be identified with serial numbers prior to X-ray examination. The serial numbers shall be in consecutive order beginning with the number 001 in each production lot. Any missing numbers are to be identified on the X-rays. The thrusters shall be arranged on trays or boards in consecutive numerical order, and each radiograph shall carry a permanent identification of the units displayed thereon. The radiographic plate identification shall include item nomenclature, the complete lot number, the span of serial numbers displayed, and the contract number. The radiographs of the entire productionlotshall accompany theballistic sampletotheactivityconducting the production lot acceptance test. Defective thrusters found during X-ray review are to be marked on the X-ray prior
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