DEV Question
That is almost correct, but you need to remember that the temperature in the stratosphere above 36000 feet is constant at -56(ish) degrees Celsius.
So if OAT = -22 at 38000 feet the ISA deviation = -22 - (-56) = +34
Remeber that ISA Deviation = OAT - ISA Temperature at that altitude.
So if OAT = -22 at 38000 feet the ISA deviation = -22 - (-56) = +34
Remeber that ISA Deviation = OAT - ISA Temperature at that altitude.
Yes, as long as you do not go above the stratosphere.
Up to 36000 feet use ISA DEV = OAT - ISA Temperature at that altitude.
Above 36000 feet in the stratosphere use ISA DEV = OAT - (-56)
Which is of course ISA DEV = OAT + 56.
If you are studying for ATPL then that should cover all of the questions.
Up to 36000 feet use ISA DEV = OAT - ISA Temperature at that altitude.
Above 36000 feet in the stratosphere use ISA DEV = OAT - (-56)
Which is of course ISA DEV = OAT + 56.
If you are studying for ATPL then that should cover all of the questions.