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| Title: | Pressurization emergency, Boeing 737-800 EI-CSC, October 7, 2000 |
| Micro summary: | A pressurization sysem operation problem on climb results in the Boeing 737 returning to origin. |
| Event Time: | 2000-10-07 at 1300 UTC |
| File Name: | 2000-10-07-IE.pdf |
| Publishing Agency: | Air Accident Investigation Unit (AAIU) |
| Publishing Country: | Ireland |
| Report number: | 2001/018 |
| Pages: | 20 |
| Site of event: | During climb-out from Stansted Airport, UK |
| Departure: | London Stansted Airport, Essex, England |
| Destination: | |
| Airplane Type(s): | Boeing 737-800 |
| Flight Phase: | Climb |
| Registration(s): | EI-CSC |
| Operator(s): | Ryanair |
| Type of flight: | Revenue |
| Occupants: | 183 |
| Fatalities: | 0 |
| Serious Injuries: | 0 |
| Minor/Non-Injured: | 183 |
| Other Injuries: |
| Executive Summary: | During climb-out from Stansted Airport (EGSS), the flight crew experienced an illumination of the “Master Caution” indicating “Overhead” on the main instrument panel. A short time later, the “Master Caution” (Overhead) illuminated again, followed by an additional warning light on the rear overhead panel, indicating that the passenger oxygen masks had automatically deployed in the cabin. Having reached FL 143, the aircraft was descended to and levelled at FL 100, where further analysis by the flight crew determined that the pressurisation system had not been properly configured for flight. The aircraft returned to the airport of departure, where it landed without further incident. There were no reported injuries to passengers or aircrew. (b) Cause(s) The incident was caused by the non-adherence, by the flight crew, to the Operator’s SOP’s for conduct and use of checklists. Cabin Altitude Aural Warning Circuit breaker and the Engine Bleed Air Switches were not correctly configured for flight. This caused the aircraft to be operated without pressurisation and air conditioning. |
| Learning Keywords: | Systems - Pneumatics |
| Systems - Pressurization | |
| Systems - Pressurization - Bleeds-off Pressurization Emergency |
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