Depends on saturation of the air. For unsaturated air parcel, Skybrary states lapse rate of 3°C/1000ft (the one I used and it didn't make sense) and 1.5°C/1000ft for saturated parcel of air. As far as I remember, the same values were presented in FAA Weather handbook. Could you specify which source did you use?
2 weeks ago
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EXPLANATION FOR THOSE WHO DIDN'T UNDERSTAND: ISA is the standard derivation of temperature at altitude. The standard temperature at sea level is +15 °C. Each 1000 feet you climb, you lose 2°C. ISA is mainly used for fuel management for commercial flights, as a higher than normal ISA will result in increased fuel burn. If you are flying at 30k feet, OAT (outside air temperature) should be -44°. If it is -46 outside, your ISA will be -2°C, because it is colder than it should be at this altitude
2 weeks ago | 1
:_Misty2: why do I have to do math to answer this stuff now?
2 weeks ago
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YESYESYESYESYESYESYESSSSSS I don't know how I got that correct, but with some mathematical intuition, 6/6!!!
2 weeks ago | 2
I let my friend who knows almost nothing about aviation guess these and he’s gotten a score of 4/6 so far. He guessed everything correctly but he messed up the 4th and 5th ones.
2 weeks ago (edited) | 1
LuxPlanes
Day 6 - HARD | Aviation Quiz Week
What is the ISA deviation for an airport at 2000 feet AMSL with a temperature of 11 °C?
2 weeks ago | [YT] | 222