MIL-STD-1559A (NOTICE 1), MILITARY STANDARD: NUMBERS, SERIAL, AIRCRAFT GAS TURBINE ENGINE, AND ENGINE MODULE ASSIGNMENT OF (04 OCT 1989) [S/S BY MIL-HDBK-1599A]., MIL-STD-1559A, dated 1 January 1984, has been reviewed and determined to be valid for use in acquisition.