Originally Posted by Jimmy Hoffa Rocks
Rapid TAT increase while in cruise ?could someone explain this ? ?
The obvious reason is that the local static temperature increases. As the thrust at an RPM as well as the maximum thrust decreases with increasing ambient temperature, it could become insufficient to maintain speed and altitude.
Another possible cause is ice accretion on the TAT sensors. Depending on what sensors the engine control system uses, that can also result in a thrust loss.