MIL-DTL-60286C
4.3.1 Breakaway torque. The torque wrench set as specified in 3.3 shall be used in conjunction with a
fixture to determine the adequacy of the joints. The chamber shall be secured in a suitable vise, and the
torque shall be applied to the cap.
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 (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
degree rotation of the assembly for four full passes.
4.3.3 Radiographic examination. All assembled initiators shall be radiographically examined in
accordance with ASTM E1742, with the 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 initiators 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 initiators 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 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.
Pin, Firing, P/N 10520474
b.
O-ring, MS29513-9
c.
Filter, P/N 10520414
d.
O-ring, P/N 10520496
e.
Pin, Shear, P/N 10520622
f.
Shear Pin Setscrew
g.
Setscrew, Initiator Cap
h.
Cartridge, Impulse, M91, P/N 8597230
4.3.4 Functional.
4.3.4.1 Ballistics. The test sample shall be rigidly supported in the fixture and fired by a source
delivering an output of 700 +25, -0 psig at the end of 15 feet of aircraft hose, MS28741-4, at 70 ± 5bF.
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 4.3.4.2.
Required pressure readings shall be taken as specified in 3.6.1.
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