1) will the engine control deliver a thrust that is available at 15 deg oat ? ( seems unlikely The physics of a gas turbine wont allow it.)
No, it won't. Temperature has to be above Tref if you want to go flex.
2) Or will may be try and fail and in the process may be cause damage to the engine ?
It won't happen.
3) Figure out i am being stupid and give a warning may be ?
Naaahh
