XL319
2nd Dec 2009, 15:42
I was looking at this question and although I got the question right albeit a bit of a guess. I am struggling to work the temperature error out. The difference between ISA and actual temp is 13.5, but when I tried to work it out it came out at 21500 or something. Obviously it is colder so you will be lower than FL300
Q. You are flying at FL 300 where the outside air temperature is -57.5°C and the pressure at MSL is 1013.25 hPa. If you assume that the difference between the actual temperature and the temperature in the ISA is valid for the whole troposphere, then the true altitude is:
A. 27000
B. 30000
C. 28500
D. 31500
C is the right answer. Anyone shed any light on this thanks.
Q. You are flying at FL 300 where the outside air temperature is -57.5°C and the pressure at MSL is 1013.25 hPa. If you assume that the difference between the actual temperature and the temperature in the ISA is valid for the whole troposphere, then the true altitude is:
A. 27000
B. 30000
C. 28500
D. 31500
C is the right answer. Anyone shed any light on this thanks.