How to calculate true altitude
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How to calculate true altitude
Can I please know why the answer is 19,340ft?
You are cruising at FL 200, OAT -40° C, sea level pressure 1033 hPa. Calculate the true altitude?
A) 21740 ft. B) 18260 ft.
C) 19340 ft.
D) 20660 ft.
Thank you!
You are cruising at FL 200, OAT -40° C, sea level pressure 1033 hPa. Calculate the true altitude?
A) 21740 ft. B) 18260 ft.
C) 19340 ft.
D) 20660 ft.
Thank you!
ISA dev is -15
Alt error is approx 4ft per degree dev per 1000ft
So error is 4x15 = 60ft per 1000
60 x 20 = 1200
So true Flight Level is 188
QNH = 1033, so approx 20 x 30 = 600 ft correction
18800 + 600 = 19400
Alt error is approx 4ft per degree dev per 1000ft
So error is 4x15 = 60ft per 1000
60 x 20 = 1200
So true Flight Level is 188
QNH = 1033, so approx 20 x 30 = 600 ft correction
18800 + 600 = 19400
