For engines to be considered to belong to the same engine family, the following list of basic parameters must be common.
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Charge cooling system
Engines with Charge Air Cooling
The charge air temperature shall be recorded and shall be, at the speed of the declared maximum power and full load, within ± 5 K of the maximum charge air temperature specified in Annex II, Appendix 1, section 1.16.3. The temperature of the cooling medium shall be at least 293 K (20 °C).
