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Computer ASTM American Society for Testing and FMS Flight Management System Materials FMU Fuel Metering Unit ASU Aerial Support Unit FMV Fuel Metering Valve ATC Air Traffic Control FOD Foreign Object Debris ATIS Automatic Terminal Information FOHE Fuel/Oil Heat ExchangerOpen official document at PDF page 11Aircraft Accident Report 1/2010: Boeing 777-236ER, G-YMMM, London Heathrow Airport, 17 January 2008
Printed page 19. PDF page 33.
that ice does not affect the downstream components, including the LP filter and the Fuel Metering Unit (FMU). The FOHE is a hybrid cross-flow / counter-flow design and it includes a matrix of fine tubes. The fuel enters the topOpen official document at PDF page 33Aircraft Accident Report 1/2010: Boeing 777-236ER, G-YMMM, London Heathrow Airport, 17 January 2008
Printed page 20. PDF page 34.
coated with a dry-film lubricant, although the fuel itself is the primary lubricant. Fuel Metering Unit The HP fuel is ported into the Fuel Metering Unit (FMU). The FMU contains a Fuel Metering Valve (FMV), which regulates the fuel flowOpen official document at PDF page 34Aircraft Accident Report 1/2010: Boeing 777-236ER, G-YMMM, London Heathrow Airport, 17 January 2008
Printed page 25. PDF page 39.
Electronic Engine Control unit (EEC). Its primary function is to control operation of the Fuel Metering Unit (FMU), based on power demands from the thrust levers and from information, including © Crown Copyright 2010 25 Section 1 - Factual InformationOpen official document at PDF page 39Aircraft Accident Report 1/2010: Boeing 777-236ER, G-YMMM, London Heathrow Airport, 17 January 2008
Printed page 26. PDF page 40.
continues to accelerate with the fuel flow controlled by the APU Controller (APUC) via a fuel metering valve. In the event of a left engine flame out in flight, due to a lack of fuel pressure in the left fuelOpen official document at PDF page 40Aircraft Accident Report 1/2010: Boeing 777-236ER, G-YMMM, London Heathrow Airport, 17 January 2008
Printed page 52. PDF page 66.
from the system that directly controls the flow of fuel into the engines, such as the fuel metering valves, are not required by either regulation; the DFDR system equipped to G‑YMMM did not record the position of the FMVs. G‑YMMMOpen official document at PDF page 66Aircraft Accident Report 1/2010: Boeing 777-236ER, G-YMMM, London Heathrow Airport, 17 January 2008