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#500406

craigwatson
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swiss- all three speeds, left, right, and standby use seperate pitot tubes, so if one ices up the others may work fine, or two may ice up and the third may be fine, lots of combinations there. Ground speed is displayed and is taken from GPS, thats a good benchmark for a gross error check.

when in a unreliable speed indication, set an engine (N1) level and pitch attitude (usually 2.5 nose up).

I could dig up reports of frozen pitot tubes causing unreliable speed indications on just about every aircraft make out there