Division 4.2
In the case of engine types within an engine family, the whole code is named Family-Type or ‘FT’, and is composed of two sections: the first section is named engine family designation and identifies the engine family; the second section is the engine type designation of each particular engine type within the engine family;
F1The engine family designation shall clearly and unequivocally identify those engines presenting a unique combination of technical features for those items set out in Part B of Appendix 3 applicable to the particular engine family.
The FT shall clearly and unequivocally identify those engines presenting a unique combination of technical features for those items set out in Part C of Appendix 3 applicable to the engine type within the engine family.