November 2015 Issue

Your Altimeter Is Lying

Itís affected by air temperature and pressure, just like the airspeed indicator.

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 itís 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. Thatís the bad news.

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