MIL-DTL-60292B
precedence. Nothing in this document, 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 strictly 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 Primary components. For the purpose of this specification, the M91 delay 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. One primary component production lot may be used in more than one
initiator production lot.
3.3 Breakaway torque. The chamber and cap of the assembled initiator shall withstand a breakaway
torque application of 400 inch pounds without loosening or deformation (see 4.2.3.1).
3.4 Residual magnetism. The initiator shall not deflect the indicator of the compass more than five
degrees in either direction using procedure 4.2.3.2.
3.5 Firing pin release. The firing pin of the assembled initiator, less safety pin, cartridge and chamber
shall release from the cocked position when the application of an axial load of 18 to 25 pounds has
withdrawn the initiator pin 0.370 inch, minimum, and 0.425 inch, maximum (see 4.2.3.3).
3.6 Initiator pin security. Application of an axial load of 200 to 220 pounds to the initiator pin of the
assembled initiator shall not withdraw the initiator pin past the safety pin. Load application shall cause no
permanent deformation of the safety pin (see 4.2.3.4).
3.7 Functional (see 4.2.3.5).
3.7.1 Ballistics. Initiators loaded with cartridges from one accepted lot and temperature conditioned shall
perform within the pressure values and ignition delay time (see 6.6.2) 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.
TABLE I. Pressure values.
Temperature
Pressure (psi)
Ignition delay time, max (ms)
(°F)
See 6.7.2)
Minimum
Maximum
-60 to -70
500
1425
65
65 to 75
600
1550
65
195 to 205
700
1700
65
3.7.2 Misfires. There shall be no misfires.
3.7.3 Mechanical failures. The initiator shall function without mechanical failure (see 6.6.1).
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