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G-ONEE: electrical failures and unreliable airspeed

Printed page label not indexed. PDF page 38.

the trapped pressure will cause the airspeed to under-read, so it was concluded that all three pitot tubes had frozen in the descent. The captain's IAS then jumped up suddenly from 260 to 345 kt in four seconds, at the
Open official document at PDF page 38AAIB final report: G-ONEE

G-ONEE: electrical failures and unreliable airspeed

Printed page label not indexed. PDF page 1.

resulted in multiple failure messages for the flight crew to manage as well as the loss of all pitot tube heating. The flight crew carried out numerous, concurrent checklists to deal with the system failures, declared a PAN and started
Open official document at PDF page 1AAIB final report: G-ONEE

G-ONEE: electrical failures and unreliable airspeed

Printed page label not indexed. PDF page 15.

heated, and if the pitot tubes freeze this will result in erroneous airspeed displayed on all three flight displays. The left and right TAT probes and both AOA vanes are also heated using power from both AC Bus 1 and
Open official document at PDF page 15AAIB final report: G-ONEE