5.2.1 Test condition parameter and test validity for engine family approval

Parameter f _a shall be determined according to the following provisions:

.1 naturally aspirated and mechanically supercharged engines:

(1)

.2 turbocharged engine with or without cooling of the intake air:

(2)

and, for a test to be recognized as valid, parameter f _ashall be such that:

(3)

If, for evident technical reasons, it is not possible to comply with this requirement, f _a shall be between 0.93 and 1.07.

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