Originally Posted by
STBYRUD
Boeing skipper here... Apart from the climb predictions, I'd guess that it also provides a reasonable takeoff N1/EPR(?) prediction before accurate TAT is available (that's at least what it does in the 737 and 777), would that make sense?
I always guessed the N1/ERP is governed by FADEC that has its own sensors, the readout of which is not directly visible on the flight deck. Incidentally, the OAT measurement of apron temperature when parked is quite accurate. Also no issues during taxi.