777 AMM 飞机维护手册 发动机和燃油控制 Engine Fuel and Control PW 777 AIRCRAFT MAINTENANCE MANUAL(6)

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Fuel Pump Filter Differential Pressure Switch
The fuel filter differential pressure switch supplies a signal to the EEC that indicates an almost clogged filter condition. Unfiltered fuel can bypass the filter element if the element becomes clogged.
BEJ ALL POST SB 777-71-0032
Fuel Bypass Valve
The fuel bypass valve attaches to the left side of the fuel pump. It sends the FMU bypass fuel to the FOC.
BEJ ALL
Training Information Point
CAUTION:  DO NOT PUT THE FULL WEIGHT OF THE FUEL PUMP ON THE SPLINES DURING THE REMOVAL OF THE FUEL PUMP FROM THE GEARBOX. IF YOU DO NOT TAKE THESE PRECAUTIONS, DAMAGE CAN OCCUR TO THE SPLINES.
EFFECTIVITY BEJ ALL  73-11-00 
Page 11 
D633W101-BEJ  Jan 05/2004 

ENGINE FUEL DISTRIBUTION -FUEL PUMP
You must remove the FMU from the pump before you remove the pump from the gearbox. To remove the pump you must remove the anti-rotation bolt. Then, loosen the other bolts until the captured washers on the bolts do not touch the fuel pump flange. Turn the pump clockwise to disengage the flange from the bolts.
EFFECTIVITY BEJ ALL  73-11-00 
Page 12 
D633W101-BEJ  Sep 05/2003 

PW4000 SERIES ENGINES

777 AIRCRAFT MAINTENANCE MANUAL

ENGINE FUEL DISTRIBUTION -FUEL PUMP

EFFECTIVITY BEJ ALL POST SB 777-71-0032  73-11-00 
Page 13 
D633W101-BEJ  Jan 05/2004 

PW4000 SERIES ENGINES

777 AIRCRAFT MAINTENANCE MANUAL

ENGINE FUEL DISTRIBUTION -FUEL PUMP

EFFECTIVITY BEJ ALL  73-11-00 
Page 14 
D633W101-BEJ  Sep 05/2003 

PW4000 SERIES ENGINES

777 AIRCRAFT MAINTENANCE MANUAL

THIS PAGE IS INTENTIONALLY LEFT BLANK

73-11-00

Page 15 D633W101-BEJ Sep 05/2003

ENGINE FUEL DISTRIBUTION -FUEL DISTRIBUTION VALVE

General
The fuel distribution valve receives metered fuel from the FMU through the fuel flow transmitter. The valve then supplies the fuel to eight fuel tubes.
Functional Description
The fuel distribution valve has two pieces. The forward piece is an adapter. It connects to the fuel flow transmitter. The aft piece connects to the fuel injector supply manifolds. It contains a strainer and a valve mechanism.
The strainer is a coarse filter. It catches fuel contaminants before the fuel goes to the fuel injectors. A bypass valve in the strainer permits fuel to pass if the strainer becomes clogged.
The valve mechanism prevents fuel leakage from the FMU and fuel flow transmitter into the engine after the engine is shut down. It also permits the upper six fuel injector supply manifolds to drain after shut down. They drain into the engine through the lower two manifolds.
EFFECTIVITY BEJ ALL  73-11-00 
Page 16 
　
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