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Old 29th Jun 2018, 19:49
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Denti
 
Join Date: Mar 2001
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I worked for a very long time in companies that required us to stay on QNH until passing TA in a climb, which is easy enough, you get warned about that on the PFD anyway (yellow QNH on boeing, blinking on airbus). However, during descent we had to set QNH as soon as we were cleared to an altitude. Now i'm working in a company that requires us to the set the cleared pressure datum once cleared there (standard for FL, even with high transition altitudes, QNH for altitudes).

Both works, and the only level bust i have seen was reverting a clearance to altitude once already on standard and due to a large spread in pressure already being above the cleared altitude.
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