Event Details

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
Site of event:During climb-out from Stansted Airport, UK
Departure:London Stansted Airport, Essex, England
Airplane Type(s):Boeing 737-800
Flight Phase:Climb
Type of flight:Revenue
Serious Injuries:0
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
Close match:Pressurization emergency, Boeing 737-204 (ADV) EI-CJC, 70 nm south of Spanish/French Pyrenees border, November 8, 2004
Pressurization emergency, Boeing 737-548, Aer Lingus, EI-CDB
Air conditioning misconfiguration resulting in cabin depressurization, Ryanair Boeing 737-204 (ADV), EI-CJE
Cabin depressurization, Westjet Airlines, Ltd., Boeing 737-200, C-FGWJ, Kelowna, British Columbia, 120 nm, NE 12 June 2000


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