Event Details

Title:Pressurization emergency, Boeing 737-500 (EI-CDF), near Wallesley, North Wales, January 16, 2001
Micro summary:Pressurization problem in climb results in a request to descend.
Event Time:2001-01-16 at 0742 UTC
File Name:2001-01-16-IE.pdf
Publishing Agency:Air Accident Investigation Unit (AAIU)
Publishing Country:Ireland
Report number:2003/013
Diversion Airport:Dublin Airport, Dublin, Ireland
Site of event:Near Wallesley, North Wales
Departure:Dublin Airport, Dublin, Ireland
Airplane Type(s):Boeing 737-500
Flight Phase:Climb
Operator(s):Aer Lingus
Type of flight:Revenue
Serious Injuries:0
Other Injuries:0
Diverted to:Dublin Airport, Dublin, Ireland
Executive Summary:The aircraft had taken off from Dublin Airport and was climbing to FL 370 enroute for Dusseldorf, when over Wallasey, the aircraft suffered a complete loss of pressurisation. The Captain initially requested ATC permission to descend, but when this was refused due to traffic, a PAN was declared and the aircraft was immediately given clearance to descend. Meanwhile, the crew attempted to regain control of the cabin pressure using “Standby Mode” and “Manual Mode” but with no effect. As the aircraft passed FL 280, control of pressurisation was suddenly re-established. The crew decided to return to Dublin and the aircraft landed there without further incident.

3.2 Causes
3.2.1 Faults were subsequently found by the manufacturer of the Cabin Pressure Controller (CPC) and the Outflow Valve which could have been inherent in the pressurisation control system at the time of the event leading to a late recovery in crew control.

3.2.2 An air supply duct was found ruptured. This also could have contributed to a late recovery in crew control combined with borderline aircraft sealing.
Learning Keywords:Systems - Pressurization
Other - Manufacturing Issues
Close match:Pressurization emergency, Final Report No. 1820 by the Aircraft Accident Investigation Bureau concerning the serious incident to the aircraft Airbus A 321-111, HB-IOA, operated by Swissair under flight number SWR 809 on 21 February 2000 during the flight
Rapid decompression, Lockheed L-1011, August 23, 1995


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