Mon Nov 12, 2018 7:23 am
#1650393
I think (but my brain is frazzled by an all-night flight) the problem lies with the ISA deviation applying to ISA conditions. Since, in this example, the QNH is not ISA you have to 'reduce' the conditions to ISA, which is what GH's 'column of air' calculation does. Having done that you can then consider the 2 degrees/1000' as a valid means of working out the temperature side of the problem. In other words, you have to make the atmosphere 'Standard' in order to use 'Standard Atmosphere' calculations.
The only very minor mistake I can see is that 0.4% should read "-15*0.004= -0.6%", not "0.04".......even if the written answer is the same
Maybe I just need more sleep
The only very minor mistake I can see is that 0.4% should read "-15*0.004= -0.6%", not "0.04".......even if the written answer is the same
Maybe I just need more sleep
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