. A TURBOJET engine is designed to create all of its propulsion from exhaust gases.  A Turbojet is a subcategory of the Turbine Engine category. 

. A TURBOFAN engine is designed to create all of its propulsion from a combination of exhaust gases and air that bypasses the combustion process and is accelerated in a ducted space between the inner (core) engine case and the outer engine fan casing.  A Turbofan Engine is a subcategory of the Turbine Engine category. 

. A TURBOPROP engine is designed to create most of its propulsion from a propeller driven by a turbine, usually through a gearbox.  A Turboprop Engine is a subcategory of the Turbine Engine category. 

. A TURBOSHAFT engine is designed to drive a rotor transmission system.  A Turboshaft Engine is a subcategory of the Turbine Engine category.

Valid combinations of Engine Category and Engine Sub-Category:
Engine Category 
 Engine Sub Category 
 
TURBINE 
 TURBOJET 
 
TURBINE 
 TURBOSHAFT 
 
TURBINE 
 TURBOFAN 
 
TURBINE 
 TURBOPROP 
 
RECIPROCATING 
 NOT APPLICABLE 
 
ROTARY 
 NOT APPLICABLE 
 
OTHER 
 NOT APPLICABLE 
 
 
 
 

   3.9  TYPE CERTIFICATE 
The type certificate is the document issued by the certifying authority to the organization that holds design responsibility.  The type certificate may cover one or more groupings of aeronautical products having similar design, performance, and safety characteristics. 
. A type certificate and its associated data sheets detail the type design, basis of certification, and applicable standards and limitations of an aeronautical product, as specified by the certifying authority. 

. The type certificate recorded is the document issued by the certifying authority to the organization that currently holds design responsibility. 

. If a certifying authority did not issue a type certificate for an aeronautical product, the permissible value is the equivalent document issued by the certifying authority.  For example AIRWORTHINESS NOTICE 26 and BCAR AR–1 are the value to those aeronautical products under the design responsibility of the United Kingdom that do not have a type certificate. 

. The term “NOT IDENTIFIED” is the value if a type certificate exists for the aeronautical product but is not currently included in the list of permissible values. 

. The term “NOT CERTIFICATED” is the value if a type certificate or similar document does not exist for the aeronautical product. 

. If a type certificate is issued by the European Aviation Safety Agency (EASA), the country name of the certifying authority is EUROPEAN UNION. 
　
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本文鏈接地址：INTERNATIONAL STANDARD FOR ENGINE MAKE, MODEL, AND SUBMODEL GROUPINGS BUSINESS RULES(7)