MIL-DTL-60292B
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 a north-south horizontal position (cap end at south) with the
compass set in an east-west heading. The assembly shall be moved at a 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
degrees rotation of the assembly for 4 full passes.
4.3.3 Firing pin release. The subassembly shall he secured in the fixture. A pull shall be applied to the
initiator pin in the longitudinal direction, in conjunction with the fixture which registers the amount of
pull.
4.3.4 Initiator pin security. The subassembly shall be secured in the fixture with the safety pin in place. A
pull shall be applied to the initiator pin in the longitudinal direction in conjunction with a fixture which
registers the amount of pull. The test shall be performed with the safety pin in both positions.
4.3.5 Functional.
4.3.5.1 Ballistics. The test sample shall be rigidly supported in the fixture and fired. The sample shall be
tested within 5 minutes after removal from the temperature conditioning chamber. When this time limit is
exceeded, the sample units shall be reconditioned in accordance with 4.3.5.2. Required pressure-time
readings shall be taken as specified in 3.7.1.
4.3.5.2 Temperature conditioning. Each assembled initiator shall be conditioned for a period of time not
less than 4 hours nor greater than 24 hours. When reconditioning initiators at -60 °F, all condensation
shall be removed from the interior surfaces before returning the initiator to the conditioning chamber.
4.4 Radiographic examination. All assembled initiators shall be radiographically examined in accordance
with ASTM E1742/E1742M, with exception that an initiator assembly will be used for the penetrameter.
Any observable imperfections in components or assembly shall be cause for rejection. The initiators 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 initators shall be identified with serial numbers prior to X-ray examination.
The serial numbers shall be in consecutive numerical order beginning with the number 001 in each
production lot. Any missing serial numbers are to be identified on the X-rays. The initiators shall be
arranged on boards or trays in consecutive 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 production lot shall accompany the ballistic sample to the activity
conducting the production lot acceptance test. Defective initiators found during X-ray review are to be
marked on the X-ray prior to shipment and those defective items shall be removed from the production
lot. Film interpretation of the radiographs shall verify the presence and correct positioning of the
following parts:
a.
O-ring present
P/N 10520496
b.
Steel balls present (3 ea)
P/N MS19060-3
c.
Firing pin
P/N 10520411
d.
Spring, initiator
P/N 10520412
e.
Seal
P/N 10520415
f.
Firing pin housing
P/N 10520410
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