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THE BRAYTON CYCLE
MIL-STD-1812 DESIGNATION SYSTEM

Airman - Aviation theories and other practices
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Force-Navy Aeronautical (ANA) Bulletin No. 306M. The other system, MIL-STD-1812 designation system, includes all newly developed (Air Force, Army, and Navy) gas turbine engines. These designation systems use standard symbols to represent the types and models of engines now used in military aircraft. ANA BULLETIN NO. 306M DESIGNATION SYSTEM The following paragraph describes the ANA Bulletin No. 306M designation system. This system has no provisions for Army designation. T56-A-14 is an example of this systems designation number. Type Symbols The first part of the designation system is a letter (or letters) that indicates each basic engine type. Table 6-1 shows the letter symbols that identify engine types. A number follows the first letter symbol. The using armed service assigns the number used in conjunction with the letter symbol as follows: !    The number 30 for the Navy. The Navy has even numbers. !    The number 31 for the Air Force. The Air Force has odd numbers. The designation of odd or even numbers does not restrict the use of the engine to the sponsoring service. Aircraft engines, regardless of type designation, are used by various services, depending on their applicability for a particular aircraft. In some instances, engines are made interchangeable for a particular airframe. Manufacturer's Symbol The second part of the designation is a dash and a letter symbol that indicates the engine manufacturer. Some of the manufacturers are listed in table 6-2. 6-17 SYMBOL ENGINE TYPE R Internal combustion, air-cooled, radial engine (reciprocating) J Aviation gas turbine (turbojet engine) T Aviation gas turbine (turboprop and turboshaft engines) TF Turbofan engine PJ Pulsejet engine RJ Ramjet engine Table 6-1.—Aircraft Letter Symbols and Engine Types MANUFACTURER SYMBOL MANUFACTURER AD Allison Division, General Motors Corp. BA Bell Aircraft Company CA Continental Aviation and Engineering Corp. CP United Aircraft of Canada Ltd. GA AiResearch Division, Garrett Corp. GE General Electric Company LA Lockheed Aircraft Company LD Lycoming Division, Avco Corp. MD McDonald-Douglas, Aircraft Company PW Pratt and Whitney Aircraft Division, United Aircraft Corp. RR Rolls Royce, Ltd. WA Curtis-Wright Corp WE Westinghouse Electric Company Table 6-2.—Engine Manufacturers







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