British Airways B763 near Varna on Sep 1st 2016, unreliable airspeed

Last Update: September 2, 2016 / 10:52:32 GMT/Zulu time

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Incident Facts

Date of incident
Sep 1, 2016

Classification
Incident

Flight number
BA-677

Aircraft Registration
G-BNWA

Aircraft Type
Boeing 767-300

ICAO Type Designator
B763

A British Airways Boeing 767-300, registration G-BNWA performing flight BA-677 from Istanbul (Turkey) to London Heathrow,EN (UK), was cleared to climb to FL360 about 40nm southeast of Varna (Bulgaria) already in contact with Sofia Center (Bulgaria), when ATC queried the aircraft to confirm they were climbing to FL360 after the aircraft climbed above cleared flight level having reached FL363 already. The crew advised they were maintaining FL360, they had a problem with the aircraft and requested ATC to keep everybody below clear of them. ATC began to turn other aircraft in opposite direction to turn out of the airway and advised aircraft on the airway in same direction of the ongoing emergency stating the emergency aircraft was flying very slow, requiring the other aircraft to deviate 10nm left/right of the airway center line, too. The crew subsequently declared Mayday and reported they had unreliable speed indications and needed to descend, the aircraft would be diverting but it was not yet known where they would go to, they had a lot of work to do and were about one hour from landing. The crew advised they probably needed to descend to FL200, but while descending requested to maintain FL300, which was approved, the aircraft maintained FL300 and continued along the planned flight track, then diverted to Vienna (Austria) for a safe landing on runway 34 about 90 minutes after Bulgarian ATC queried the aircraft for busting the assigned flight level.

The occurrence aircraft is still on the ground in Vienna about 17 hours after landing.
Incident Facts

Date of incident
Sep 1, 2016

Classification
Incident

Flight number
BA-677

Aircraft Registration
G-BNWA

Aircraft Type
Boeing 767-300

ICAO Type Designator
B763

This article is published under license from Avherald.com. © of text by Avherald.com.
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