MIL-DTL-60277B
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AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)
ASTM E 1742
Standard Practice for Radiographic Inspection
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19428-2959.)
2.4 Order of precedence. In the event of a conflict between the text of this document and the references
cited herein, the text of this document takes 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 to the specifications
referred to on the respective drawings unless specific approval in writing covering a departure 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 M90 delay cartridge (Drawing
8596123) 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 each 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 the procedures in 4.3.2.
3.5 Functional.
3.5.1 Ballistics. Initiators loaded with cartridges from one accepted lot and temperature conditioned shall
perform within the pressure values and delay time specified in table I. Pressure values shall be recorded at
the end of 3 feet of aircraft hose, assembly number MS28741-4, and a pressure chamber with a volume of
1 cubic inch (see figure 1).
3.5.1.1 Initiation. The initiator shall be fired by a source delivering an output pressure of 700 +25, -0
pounds per square inch (gage) (psig) applied at a rate between 10,000psig/sec and 50,000psig/sec at 70 ±
5°F.
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