Main Fuel Tank Fuel Boost Pumps
Each main tank has a forward and an aft boost pump. The boost pumps are on the rear spar. The left forward boost pump is aft of the fourth fuel tank access door. The left aft boost pump is aft of the third fuel tank access door. The right tank boost pumps are in a similar position on the right rear spar.
Engine Fuel Spar Valves
There is one spar valve in each main tank. You get access to the valve bodies through the fifth fuel tank access doors. The valve actuators are on the rear spar aft of the fifth fuel tank access doors.
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ENGINE FUEL FEED -COMPONENT LOCATIONS -TANKS
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ENGINE FUEL FEED -COMPONENT LOCATIONS -REAR SPAR -1
Override/Jettison Pumps
The engine fuel feed system has two override/jettison pumps. One pump is for each half of the center tank. They attach to the rear spar of the center wing section. You get access to the pumps in the main wheel wells.
Center Tank Water Scavenge Jet Pumps
Each half of the center tank has a water scavenge jet pump. The pumps attach to the rear spar of the center tank wing section , outboard of the override/jettison pumps.
Center Tank Fuel Scavenge Jet Pumps
Each half of the center tank has a fuel scavenge jet pump. The pumps attach to the rear spar of each wing, outboard of the main landing gear drag brace.
Crossfeed Valves
The engine fuel feed system has two crossfeed valves. The crossfeed valve actuators attach to the rear spar of the left wing, outboard of the main landing gear drag brace.
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ENGINE FUEL FEED -COMPONENT LOCATIONS -REAR SPAR -1
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ENGINE FUEL FEED -COMPONENT LOCATIONS -REAR SPAR -2
Boost Pumps
The engine fuel feed system has four boost pumps. Two pumps are for each main tank. They attach to the rear spar of each wing. The forward boost pumps are outboard of each main landing gear shock strut. The aft boost pumps are inboard of each main landing gear shock strut. The aft boost pump has a shield that protects it.
Main Tank Water Scavenge Jet Pumps
Each main tank has a water scavenge jet pump. The pumps attach to the rear spar of each wing, inboard of the forward boost pumps, near the landing gear trunnion door.
Engine Fuel Spar Valves
The engine fuel feed system has two fuel spar valves. The spar valve actuators attach to the rear spar of each wing, outboard of the forward boost pumps.
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ENGINE FUEL FEED -COMPONENT LOCATIONS -REAR SPAR -2
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ENGINE FUEL FEED -COMPONENT LOCATIONS -FLIGHT DECK AND PASSENGER COMPARTMENT
Engine Fuel Spar Valve Battery
The engine fuel spar valve battery is in the flight deck. Four fasteners attach the battery to the outboard side of the right side stowage bin.
Relays
These relays are in the P101 distribution integration panel:
*
Left engine fuel spar valve control
*
Right engine fuel spar valve control
*
APU shutoff valve control
*
APU remote shutdown.
The P101 panel is in the passenger compartment. It is above the center stowage bins, near door 1L.
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ENGINE FUEL FEED -COMPONENT LOCATIONS -FLIGHT DECK AND PASSENGER COMPARTMENT
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777 AIRCRAFT MAINTENANCE MANUAL
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ENGINE FUEL FEED -OVERRIDE/JETTISON PUMP
General
The override/jettison pumps supply fuel from the center tank to the engine feed manifold. They also supply fuel to the refuel/ jettison manifold during fuel jettison.
The override/jettison pumps can supply fuel at a pressure of 36 psi and a flow rate of 70,000 pounds (31,750 kgs) per hour. Each pump assembly has a motor-impeller and a housing.
Location
There is one override/jettison pump in each main landing gear wheel well, at the rear spar. The housings are inside the center wing section, on the rear spar. The motor-impellers install in the housings.
Pump Housing
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