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What happens if you preselect your destination QNH during cruise?

ATC will not see a different altitude. The radar ATC is known as secondary surveillance radar or SSR, where transponders return a pilot set 'squawk' code and the pressure altitude. These transponders ...
GdD's user avatar
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What happens if you preselect your destination QNH during cruise?

Mode-C transponder reporting is done using QNE barometer settings, regardless of the QNH setting by the pilot. This precisely avoids the problem that you mention. The goal of the transponder is to ...
Sanchises's user avatar
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