*
EEC

*
Programming plug

*
Fuel temperature sensor

*
Servo fuel heater

*
Wiring harness bifurcation conduit.

The ERU and EEC attach to the fan case. The programming plug is on top of the EEC.
The fuel temperature sensor attaches to the fuel outlet line on the rear of the fuel/oil cooler.
The servo fuel heater attaches to the HPC case just below the fuel/oil cooler.
The wiring harness bifurcation conduit is on the bottom of the engine between the intermediate case and HPC case.
Component Locations -Gearbox
The PMA and FMU are on the front face of the main gearbox. The PMA attaches to the middle of the gearbox. The FMU attaches to the front of the fuel pump on the right side of the gearbox.
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ENGINE FUEL CONTROL -ENGINE COMPONENT LOCATIONS

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ENGINE FUEL CONTROL -AIRPLANE COMPONENT LOCATIONS

Flight Deck
The EEC mode switches are part of the start/ignition controls on the P5 overhead panel.
The EEC maintenance switches are on the P61 overhead maintenance panel.
Main Equipment Center
The two EDIUs are in the main equipment center. The left EDIU is on the E1-5 shelf. The right EDIU is on the E4-1 shelf.
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ENGINE FUEL CONTROL -AIRPLANE COMPONENT LOCATIONS

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ENGINE FUEL CONTROL -AIRPLANE INTERFACES

General
The engine fuel control system has many interfaces with airplane components and systems. Some of the interfaces are analog, but most are digital. The interfaces are with the EEC. Some of the analog interfaces go through the ERU. The digital interfaces go through the EDIU.
Analog Interfaces
These are the components that have analog interfaces with the engine fuel control system:
*
Thrust lever angle (TLA) resolver

*
Engine fire switch

*
Fuel control switch

*
Thrust reverser interlock actuator

*
EEC maintenance switch

*
Start/ignition selector

*
EEC mode switch

*
Airborne vibration monitor (AVM) signal conditioner

*
AIMS

*
ELMS

*
Fuel metering unit (FMU)

*
Engine relay unit (ERU).

Thrust Lever Angle Resolver
The TLA resolver supplies the EEC with a signal in proportion to the thrust lever position. The EEC supplies power to the resolver.
Engine Fire Switch
The engine fire switch sends a signal to the FMU to close the minimum pressure and shutoff valve (SOV).
　
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本文鏈接地址：777 AMM 飛機維護手冊 發動機和燃油控制 Engine Fuel and Control PW 777 AIRCRAFT MAINTENANCE MANUAL(10)