Met Question?

[JetMouse]

Hello

I would like a little help with this please - many thanks...

You intent to overfly a mountain range. The recommended minimum flight altitude is 15,000ft/amsl. The air mass you will fly through is on average 15C warmer than standard. The altimeter is set to QNH 1023. At what altimeter reading will you effectively be at the recommended minimum flight altitude?

[pugzi]

You intend to overfly a mountain range. The recommended minimum flight altitude is, according to the aviation chart, 15000 FT/AMSL. The air mass that you will fly through is on average 15°C warmer than the standard atmosphere. The altimeter is set to QNH (1023 hPa). At what altimeter reading will you effectively be at the recommended minimum flight altitude?
A 14100 FT.
B 13830 FT.
C 14370 FT.
D 15900 FT.

I think this is the questino you are after.

Remember this. For every 1°C deviation from ISA your altimeter is wrong by 4ft for every 1000ft you have.
In this case you have 15°C ISA Deviation. So 15 x 4 gives you 60ft error per every 1000ft. You are at 15000ft so 60 x 15 gives you a toal error of 900ft.
Its "warm" in the question, and when it's warm TRUE ALTITUDE is more than INDICATED ALTITUDE.
So, to have a true altitude of 15000ft the indicated altitude must be 14100ft!!

Ta Da!!

Courtesy of Pilot Ground Training

[JetMouse]

Great thanks! Easy when you know how...