The accurate display of airspeed information at high altitude is vital because the margins between the low-speed and high-speed buffet margins can be thin. Thus, a small deviation in the aircraft’s airspeed or an encounter with turbulence can put the aircraft into a threatening buffet condition. If an airspeed indication malfunction occurs at high altitude, inappropriate pilot inputs to the flight controls can result in a temporary or permanent loss of control of the aircraft’s ...


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