Event Details

Title:Pressurization failure, Boeing 737-436, G-DOCE
Micro summary:This Boeing 737-436 experienced a pressurization failure.
Event Time:2003-05-30 at 1630 UTC
File Name:2003-05-30-UK.pdf
Publishing Agency:Aircraft Accident Investigation Board (AAIB)
Publishing Country:United Kingdom
Report number:EW/C2003/05/06
Diversion Airport:Saint-Exupery International Airpot, Lyon, France
Site of event:Cruise
Departure:Mareseille Provence Airport, Marseille, France
Destination:Gatwick Airport, London, England
Airplane Type(s):Boeing 737-436
Flight Phase:Cruise
Operator(s):British Airways
Type of flight:Revenue
Serious Injuries:7
Other Injuries:0
Diverted to:Saint-Exupery International Airpot, Lyon, France
Executive Summary:Whilst in the cruise the crew began to feel some discomfort in their ears. This was shortly followedby the cabin altitude warning horn which indicated that the cabin altitude had exceeded 10,000 feetand this was seen to continue to climb on the cockpit gauge. At the same time, the primary AUTOmode of the pressure control failed, shortly followed by the secondary STBY mode. The crew selected the first manual pressure control mode, but were unable to control the cabin altitude. Anemergency descent and subsequent diversion to Lyon was carried out. The failure of thepressurisation control system was traced to burnt electrical wiring in the area aft of the aft cargo hold. The wiring loom had been damaged by abrasion with either a p-clip or 'zip' strap that, over time,resulted in the conductors becoming exposed, leading to short circuits and subsequent burning of thewires. There was no other damage. The wiring for all the modes of operation of the rear outflowvalve, in addition to other services, run through this loom.
Learning Keywords:Operations - Maintenance
Systems - Electrical
Systems - Pressurization


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