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Printed page 2. PDF page 16.
London Heathrow. The investigation identified that the reduction in thrust was due to restricted fuel flow to both engines. It was determined that this restriction occurred on the right engine at its Fuel Oil Heat Exchanger (FOHE). For the leftOpen official document at PDF page 16Aircraft Accident Report 1/2010: Boeing 777-236ER, G-YMMM, London Heathrow Airport, 17 January 2008
Printed page 89. PDF page 103.
confirm the response of the EEC, the FMU and the MEP, under certain conditions, including restricted fuel flow. The following slave engine components, which were of a comparable build standard to those fitted to the engines on G-YMMM, used onOpen official document at PDF page 103Aircraft Accident Report 1/2010: Boeing 777-236ER, G-YMMM, London Heathrow Airport, 17 January 2008
Printed page 90. PDF page 104.
engine on a test bed. 1.16.4.2 Full‑scale engine testing (L12) Testing of an engine with restricted fuel flow was accomplished at Rolls‑Royce Derby using a development Trent 895 engine serial number L12 (hereinafter referred to as ‘the L12 tests'). TheOpen official document at PDF page 104Aircraft Accident Report 1/2010: Boeing 777-236ER, G-YMMM, London Heathrow Airport, 17 January 2008
Printed page 93. PDF page 107.
EW/C2008/01/01 more severe and consistent with the length of time the test pumps operated in a restricted fuel flow condition. L12 test observations The testing subsequently showed that, with the restriction placed between 25 and 45 ft from the interface,Open official document at PDF page 107Aircraft Accident Report 1/2010: Boeing 777-236ER, G-YMMM, London Heathrow Airport, 17 January 2008
Printed page 114. PDF page 128.
boost pump check valves and the suction check valve) were blocked and the third had a restricted fuel flow. In this configuration, the suction from the engine low pressure fuel pump would be strong enough to open both the jettisonOpen official document at PDF page 128Aircraft Accident Report 1/2010: Boeing 777-236ER, G-YMMM, London Heathrow Airport, 17 January 2008
Printed page 123. PDF page 137.
attributed the engine power loss to icing of the engine fuel pump screens, causing a restricted fuel flow to the engines. Contributory factors were excess water/ice in the fuel tanks and no bypass on the fuel pump screen. © CrownOpen official document at PDF page 137Aircraft Accident Report 1/2010: Boeing 777-236ER, G-YMMM, London Heathrow Airport, 17 January 2008