Originally Posted by
Tinstaafl
ISA temp is 2*C / 1000' which is 0.5*C per 250'.
So ISA T* at 3240' is nearer 8.5*C, not 9*C
That gives 5100' for an answer, so B
==========
Or using my CR whiz wheel a fraction over 5000' which is also more than close enough to pick B
One of the few bizarre things that actually took hold during my Met lessons sometime last century was the Dry Adiabatic Lapse Rate is 1.98C per 1,000ft. So the ISA Temp at 3,240ft is 8.5848*C rounded to 8.6*C, not 8.5*C. Pretty much what
eckhard calculated.
That would round out the result a foot further from 'B'
