Event Details

Title:Pressurization failure, BAe 146-300, EI-CLG
Micro summary:This BAe 146-300 experienced a pressurization and electrical emergency climbing out of FL190.
Event Time:1999-08-31 at 0838 UTC
File Name:1999-08-31-UK.pdf
Publishing Agency:Aircraft Accident Investigation Board (AAIB)
Publishing Country:United Kingdom
Report number:EW/G99/08/42
Diversion Airport:Manchester International Airport, Manchester, England
Site of event:Daventry
Departure:London Stansted Airport, Essex, England
Destination:Dublin Airport, Dublin, Ireland
Airplane Type(s):BAe 146-300
Flight Phase:Climb
Operator(s):Aer Lingus
Type of flight:Revenue
Serious Injuries:0
Other Injuries:0
Diverted to:Manchester International Airport, Manchester, England
Executive Summary:The aircraft was on a scheduled service from London Stansted Airport to Dublin and was climbing to FL220. On passing FL190 the Autopilot tripped out, warning flags appeared on the commander's ADI (Attitude Direction Indicator) and, at the same time, a 'GEN OFF LINE' caption illuminated for the No 1 electrical generator and the caption 'ELECT' appeared on the Master Warning panel. The commander took manual control of the aircraft and he and the first officer felt a change of pressure in their ears. They checked the Pressurisation panel on the flight deck and saw the cabin pressure indicator showing a rate of descent of some 1,800 to 2,000 feet/min. The crew switched the Pressurisation controller to MANUAL mode and selected the cabin air discharge valves to fully shut.

As a precaution the crew donned oxygen masks and requested descent to FL100. They were then further cleared down to FL80 and confirmed to ATC that they would like to declare an emergency and that they had electrical and pressurisation problems. After evaluation of the situation at FL80 they requested a downgrade of the Emergency and a diversion to Manchester so that the No 1 electrical generator could be examined. During the descent the commander instructed the first officer to start the APU. The landing at Manchester was normal and there was no injury to crew or passengers.

The No 1 generator was removed at Manchester and later examination showed that it had tripped off-line due to a high temperature in the oil supply to the CSD (Constant-Speed Drive). The Pressurisation controller was found to be serviceable but was removed and later sent for a full examination, which showed no defects.
Learning Keywords:Systems - Electrical
Systems - Pressurization
Close match:Pressurization emergency, Final Report by the Aircraft Accident Investigation Bureau concerning the incident to the MCDonnell Douglas DC-9-82 aircraft, LN-RML operated by SAS Scandinavian Airlines System under flight number SK 682 on 13 July 2003
Pressurization failure, Boeing 737-436, G-DOCE


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