37240 - Aircraft engines & Engine parts (Miscellaneous)
37241 - Military engines
37242 - Aircraft engines for Civilian aircraft
3724201 - - Complete civil aircraft engines, Spark-ignition reciprocating or Rotary internal-combustion
3724203 - - Complete civil aircraft engines, Turbojet & Turbofan, Thrust <= 25 kn (5620 lb)
3724205 - - Complete civil aircraft engines, Turbojet & Turbofan, Thrust > 25 kn (5620 lb)
3724207 - - Complete civil aircraft engines, Turboshaft (Turbo propeller) Power <= 1100 kW (820 hp)
3724209 - - Complete civil aircraft engines, Turboshaft (Turbo propeller) Power > 1100 kW (820 hp)
3724211 - - Aircraft engines for Civilian aircraft: Reciprocating (Piston)
3724212 - - Aircraft engines for Civilian aircraft: Turbojet & Turboshaft
3724213 - - Aircraft engines for Civilian aircraft: Turboprop & Turbofan
3724214 - - Aircraft engines for Civilian aircraft: other + Jato bottles & Liquid power plants, excl missile engines
37243 - Aeronautical services on aircraft engines
3724321 - - Research & Development work on military aircraft engines
3724323 - - Research & Development work for Civilian aircraft engines
3724331 - - Aeronautical services on aircraft engines for Military aircraft engines & all other Engines built to military specification (General)
3724333 - - Aeronautical services on aircraft engines for Civilian aircraft engines (General)
3724399 - - Aeronautical services on aircraft engines (Miscellaneous)
37244 - Aircraft engine parts & Accessories
3724401 - - Aircraft parts & Accessories for Military spark ignition reciprocating or Rotary internal combustion engines
3724402 - - Aircraft parts & Accessories for other Military engines
3724405 - - Aircraft parts & Accessories for Civilian spark ignition reciprocating or Rotary internal combustion engines
3724406 - - Aircraft parts & Accessories for other Civilian engines
3724413 - - Aircraft engine parts & Accessories for Military aircraft engines & all other Aircraft engines built to military specifications
3724453 - - Aircraft engine parts & Accessories for Civilian aircraft engines
3724499 - - Aircraft engine parts & Accessories (Miscellaneous)
3724XX0 - - Aircraft engines & Engine parts (Miscellaneous - Volume)
3724XX2 - - Aircraft engines & Engine parts (Miscellaneous - Speciality)