Temperature Error Correction Question (Cathay Book)
Ok - I am now stumped - there is the following question in the Cathay Book:
On a 3° glide path, OAT -25°, OM crossing height of 1760', the aircraft altitude will indicate:
a. 1820'
b. 1760'
c. 1720'
The answer given is A. I agree that the answer must be higher than the indicated but using the standard (approximate) temp error calculation I reach:
(Assuming Gnd OAT = -21°C)
4 * (21+15) * 1.8 = 4 * 36 * 1.8 = 259.2ft
Therefore answer is about 2020ft
Am I massively wrong or is the question out???
Cheers