![]() ![]() This allows Company rules to specify that runway X always use -5% unless (blah blah). Boeing made life a little easier for pilots by also offering the directly selectable 5% and 15% derates. It does this by telling the FADEC to behave as if the outside air temperature was much higher then actual and is the normal method to de-rate engines used by many other aircraft. Sorry Eric,This setting is used to derate take-off thrust (notice the D_TO N1% figure?). please sign your posts with your real name - forum rules) The information you need is in manual 01 - Takeoff data. which is much easier then having to do the same calculations for every take-off from the same runway. Climb 1 and 2 lower the climbout N1 rating, increasing the life of the engine and burning less fuel.Sorry Eric,This setting is used to derate take-off thrust (notice the D_TO N1% figure?). The only reason it is not automatic is because the runway ambient temperature may differ from where you are parked, say the shade of an airport terminal compared to a runway in full sun. 1L is pilot entered outside air temperature. ![]()
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