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|  MIL-I-60281A
however, supersedes applicable laws and regulations unless a specific exemption has been
obtained.
3. REQUIREMENTS
3.1 Materials. All materials used in the manufacture of the initiators shall conform to the
specifications referred to on the respective drawings unless specific approval in writing
covering a departure therefrom has 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 M91 impulse cartridge
(Drawing 8597230) 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-
82871 or MIL-I-60518 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, and a pressure chamber with a volume of 1 cubic inch.
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 5 F.
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).
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