MIL-STD-1559A

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                   MIL-STD-1559A, MILITARY STANDARD: NUMBERS, SERIAL, AIRCRAFT GAS TURBINE ENGINE AND ENGINE MODULE ASSIGNMENT OF (01 JAN 1984) [S/S BY MIL-HDBK-1559]., This standard describes the method of assignment and arrangement of letters and numerals used by the Military Services to identify complete engines and module (major subassemblies thereof) as to the manufacturer and series in production. The engine/module serial number shall be the only one required for assignment and application to the complete engine and modules thereof. This standard applies to propulsion engines and airborne auxilary power units.