Hello to all, Finished reading the Manual for the Level-D 767 and I noticed something that quite didnt make sense to me. When in the procedures section it mentioned to have the Engine anti ice ON when icing/rain/snow/moisture ect. and when outside temperature is below -10'C . But then it mentioned the following: "When at cruising altitude and cruising speed if the altitude is below -40'C the anti ice for the engines are not needed". Is this a typo, or is there a reason for this? Does the Anti Ice need to be turned on at all times below -10'C? Also another quick question, Can the TAXI lights be on when the landing gear is retracted? The taxi lights are on the nose gear right? So if the gear is retracted whats the point of the taxi lights on? Many Thanks
P.S. whats a DE-RATED Takeoff/DE-RATE Thrust?