Background
On 8 February 2005, an Airbus A340-642, registration G-VATL, was en route from Hong Kong to London Heathrow when it experienced an incident. The Air Accidents Investigation Branch (AAIB) conducted an investigation and published report 4/2007.
Aircraft Information
The aircraft was equipped with a fuel system consisting of multiple tanks, pumps, and valves, controlled by two Fuel Control and Management Computers (FCMCs). The fuel system included a System Display (SD) page for monitoring fuel quantities and transfer status. The flight warning system provided alerts for low fuel level, collector cell not full, pump low pressure, and transfer warnings.
Flight Details
The incident occurred during the cruise phase of the flight. The flight crew observed fuel-related warnings and indications on the Electronic Centralized Aircraft Monitor (ECAM) and system displays. The exact sequence of events is detailed in the flight data recorder and cockpit voice recorder information.
Investigation
Post-incident examination of the aircraft was conducted in Amsterdam and later at London Heathrow. The FCMCs, Flight Warning Computers (FWCs), System Data Acquisition Concentrators (SDACs), and Display Management Computers (DMCs) were removed and tested. Additional tests were performed on the FCMCs and FDCs, as well as scenario testing by component manufacturers. The investigation also reviewed previous fuel management incidents in Airbus aircraft and analyzed the frequency of 'FCMC1(2) FAULT' events. Operational information and flight crew advice following FCMC faults were considered. The fuel system design, including automatic and manual fuel transfer controls, was examined. Regulations related to fuel systems were reviewed.
Findings
The investigation did not explicitly state a probable cause. The report focused on the technical aspects of the fuel system and the occurrence of fault indications.
Conclusion
The AAIB report provides factual information on the incident, system design, and investigation results without assigning a definitive cause.