Not trying to fool anyone.
A situation occured recently where a crew reported to maintenance that the engines "did not make full power" during a rated takeoff. ie. their observation was that the N1 needles did not come up to the N1 bugs during an autothrottle rated takeoff; albeit by about 1.2%.
The question was put to me by the engineer presented with the "problem"
The engineer's suggestion was that if a change in temp occurred between entering FMC temperature and takeoff, without the crew updating (it can change pretty quickly here) then that could have been the cause of the discrepancy.
My question is. Does the autothrottle always set FMC generated figures during a rated thrust takeoff or will it recieve input from perhaps EEC to limit the N1 to a possibly lower value yet still delivering rated thrust?
Has anyone seen this before?