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! |
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 |
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