I'll wager that these are merely 100% gage calibration points. On a cold day N1% will certainly be lower than on ISA day. (Because of increasing air density).
At moderately higher OAT N1 will increase, but once above the flat-rate limit, N1 falls off again (for EGT protection).
Last edited by barit1; 8th February 2008 at 02:19.