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 atmospheric pressure, not true altitude, converting pressure readings into an indicated altitude based on a predefined International Standard Atmosphere (ISA).
Real-world deviations from ISA conditions (pressure and temperature) introduce altimeter errors, causing indicated altitude to differ from true altitude and requiring constant pilot adjustments and awareness.
Extreme pressure (e.g., above 31.00 or below 28.00 in. Hg) or low temperatures necessitate specific ATC procedures and mandatory altitude corrections to prevent flying dangerously lower than indicated.
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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