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|  MIL-I-46576A(OS)
been obtained from the cognizant Navy design activity prior to manufacture. When alternate materials or
methods of manufacture are specified on the drawings, the bidder's selections shall be clearly stated in the
proposal.
3.2 Components.
3.2.1 Primary components. For the purpose of this specification, the M73 impulse cartridge (Drawing
8594157) is defined as a primary component. Only primary components from a single lot shall be used in a
production lot of initiators; however, one primary component production lot may be used in more than one
initiator production lot.
3.2.2 Component parts. All component parts shall meet the applicable requirements of MIL-I-60522
or MIL-I-82880 prior to assembly.
3.3 Breakaway torque. The chamber and cap of each assembled initiator shall withstand a breakaway
torque application of 400 inch-pounds without loosening or deformation (see 4.3.1).
3.4 Residual magnetism. The initiator shall not deflect the indicator of the compass more than five
degrees in either direction (see 4.3.2).
3.5 Radiographic examination. Each initiator assembly shall be radiographically examined for defects
(see 4.3.3).
3.6 Functional.
3.6.1 Ballistics. Initiators loaded with cartridges from one accepted lot and temperature conditioned shall
perform within the pressure values and delay times (see 6.4.1) specified in table I. Pressure values shall be
recorded at the end of 15 feet of aircraft hose, assembly number MS28741-4.
3.6.1.1 Initiation. The initiator shall be fired by a source delivering an output pressure of 700 +25, 0
pounds per square inch gage (psig) at 70 5F.
3.6.2 Misfires. There shall be no misfires.
3.6.3 Mechanical failures. The initiator shall function without mechanical failure (see 6.4.2).
TABLE I. Pressure values.
Temperature (F)
Pressure (psig)
Ignition delay
milliseconds, max
Minimum
Maximum
60 to 70
550
1450
65
65 to 75
575
1500
65
3
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