![]() ![]() Off at Full power -20% -25% = 60% of the full power of the engine - scary It follows that an engine may beĭe-rated and also be using reduced thrust in which case you could be taking The T/O de-rates (TO-1 & TO-2) can be 10 to 20%. Through the FMC on TAKEOFF REF 2/2 or N1 LIMIT (NG's) but this is prohibited by Non of which can be done by the pilot in-flight.Ī temporary form of de-rating known as a "T/O de-rate" is accessible When an engine is de-rated, theįull (un-de-rated) thrust is no longer available because this would requireĬhanges to the EEC, HMU, fuel pump, engine ID plug and the loadable software Where B2 & C1 engines are mixed on the same airframe. It also known as: " Flex" (Airbus & Fokker), " Graduation", " Reduced Take-offĪ de-rate is a semi-permanent engine fix, used to reduce the maximum thrustĪvailable for instance down to 20k from 22k on -3/700's.Temperatures are entered in the N1 LIMIT page. ![]() Take-off N1's will be computed by the FMC and displayed on the CDU. The ambient temperature is also entered here (as This temperature isĬalled the "Assumed Temperature" and is entered into the FMC TAKEOFF ![]() Tables (see example at foot of page) with the actual takeoff weight, and then determining the hottest outsideĪir temperature at which the take-off could be performed. We find the assumed temperature by entering the take-off Required for a safe take-off, thereby conserving engine life and hence reducing This is a way of reducing the take-off thrust to the minimum ![]()
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