All instruments in your panel lie some of the time. Some of them lie all the time. Even if you have a glass panel that eliminates things like compass turning errors, and its connected to an air-data computer so it always know the true airspeed, your back-up systems likely are steam gauges, the old-fashioned, mechanical kind. Thats the bad news.
Altimeters measure pressure, not true altitude, and are calibrated to a standard atmosphere (ISA); real-world variations in pressure and temperature inherently cause indicated altitude to differ from true altitude.
Incorrect altimeter pressure settings or extreme low-pressure conditions can lead to an aircraft being significantly lower than indicated, posing a safety risk, with ATC providing guidance for extreme pressure scenarios.
Cold temperatures also cause altimeter errors, resulting in the aircraft flying lower than indicated, necessitating mandatory cold temperature corrections at specific airports and temperatures for safe operations.
All instruments in your panel lie some of the time. Some of them lie all the time. Even if you have a glass panel that eliminates things like compass turning errors, and it’s connected to an air-data computer so it always know the true airspeed, your back-up systems likely are steam gauges, the old-fashioned, mechanical kind. That’s the bad news.
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