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Thread: Descending through a high to low QNH
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Old 10th Aug 2021, 12:07
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extricate
 
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Descending through a high to low QNH
Hi there,

Just want to get your thoughts on this. Let's say the TL is FL 100. If on descend, you switch to local QNH of say 1034 from 1013. Close to FL 100, ATC issue a last minute clearance to level off at FL100. And you switch to 1013 on levelling, the altimeter will over-read. As compared to descending from a high to low QNH?

Thanks for your time
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