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| 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 |
| Pages: | 8 |
| Diversion Airport: | Dublin Airport, Dublin, Ireland |
| Site of event: | Near Wallesley, North Wales |
| Departure: | Dublin Airport, Dublin, Ireland |
| Destination: | |
| Airplane Type(s): | Boeing 737-500 |
| Flight Phase: | Climb |
| Registration(s): | EI-CDF |
| Operator(s): | Aer Lingus |
| Type of flight: | Revenue |
| Occupants: | 25 |
| Fatalities: | 0 |
| Serious Injuries: | 0 |
| Minor/Non-Injured: | 25 |
| 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 |
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