Unreliable Airspeed

A blockage in the pitot-static system leads to unreliable airspeeds and/or altitude, and possible accidents. In fact, they might increase with electronic cockpits.

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With “steam gauge” round dials, the airspeed reading was mechanically determined inside the airspeed indicator. Likewise, the altimeter had its own independent mechanical movement, and the vertical speed indicator had a similar arrangement. In today’s digitally integrated cockpits, the altitude, airspeed, and vertical speed are developed from solid state sensors inside an air data computer […]
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