Event Details

Title:Instrument failure, Airbus A319-131, G-EUOB
Micro summary:After a CLUNK and the failure of a number of systems, the crew declared an emergency.
Event Time:2005-10-22 at 1926 UTC
File Name:2005-10-22-UK.pdf
Publishing Agency:Aircraft Accident Investigation Board (AAIB)
Publishing Country:United Kingdom
Report number:EW/C2005/10/05
Diversion Airport:Unknown
Site of event:Climb to FL2000
Departure:London Heathrow Airport, London, England, United Kingdom
Destination:Budapest Ferihegy Interantional Airport, Budapest, Hungary
Airplane Type(s):Airbus A319-131
Flight Phase:Climb
Operator(s):British Airways
Type of flight:Revenue
Serious Injuries:0
Other Injuries:0
Diverted to:Unknown
Executive Summary:The aircraft departed London Heathrow at 1918 hrs on a scheduled flight to Budapest. At 1926 hrs, as it approached FL200 in dark but clear weather conditions, the crew reported that there was an audible ‘CLUNK’ and the flight deck became dark with a number of systems and flight information displays being lost. The crew reported the following symptoms:

- Loss of both the commander’s and the co-pilot’s primary flight and navigation displays and the ECAM upper display, leaving only the ECAM lower display available,

- Loss of the autopilot, with an associated aural Master Warning tone,

- Loss of autothrust, with an associated aural Master Caution tone,

- Loss of intercom,

- Loss of most flight deck lighting including all integral lights on the glareshield, overhead and pedestal panels.

The commander, who was in the left seat and the Pilot Flying (PF), took manual control and maintained the aircraft attitude by reference to the external night horizon and the standby horizon. There was a low level of ambient light in the flight deck, and although the standby instruments for attitude, altitude and airspeed reference were operating, they were not lit. The commander attempted to transmit a ‘MAYDAY’ call on VHF No 1, however this was not received by Air Traffic Control because the radio was no longer powered. The ECAM actions displayed on the lower ECAM screen were carried out by the co-pilot. The investigation has established that the primary flight instruments and most of the affected systems were restored after about ninety seconds, following selection of the acess feed push button switch to altn, in accordance with the ECAM procedure.
Learning Keywords:Operations - Bang, pop, crack, sizzle!
Systems - Autopilot/Autothrottle
Systems - Electrical
Systems - Flight Instruments
Systems - Navigation Systems


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