MIL-STD-1557A (NOTICE 3)
MIL-STD-1557A (NOTICE 3), MILITARY STANDARD: DESIGNATION OF AIRCRAFT PROPULSION RECIPROCATING ENGINES (16 JUL 1993) ., MIL-STD-1557A, dated 25 October 1983, is hereby csncelled and superseded by MIL-STD-1812, Type Designation, Assignment and Method for Obtaining.
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