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(11)

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Fuel Control Switch
The fuel control switch supplies the EEC with a fuel-on signal through the ERU. It also permits the ELMS to supply ac power to the EEC. When you move the fuel control switch from RUN to CUTOFF, the ELMS sends a reset signal to each EEC channel. This signal stops the programs of the EEC and sets them to run from the start (boots the computer).
Thrust Reverser Interlock Actuator
The EEC energizes the thrust reverser (T/R) interlock actuator during reverser operation. The EEC supplies a ground through the ERU and ELMS to energize the actuator.
EEC Maintenance Switch
The EEC maintenance switch lets the ELMS supply ac power to the EEC during maintenance operations.
Start/Ignition Selector
The start/ignition selector lets the ELMS supply ac power to the EEC. It also sends a start signal through the ERU to the EEC.
EFFECTIVITY BEJ ALL  73-21-00 
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ENGINE FUEL CONTROL -AIRPLANE INTERFACES

EEC Mode Switch
The EEC mode switch supplies a signal to the EEC to put it into the normal (EPR) or alternate (N1) mode of control. The EEC turns on the ALTN light in the mode switch when it is in the alternate mode.
AVM SCU
Analog signals of N1 and N2 go through the EEC to the AVM SCU.
AIMS
Analog signals of N1 and N2 go through the EEC to the AIMS.
ELMS
The ELMS supplies power to the ERU and EEC.
ERU
The ERU supplies control power and discrete data to the EEC. The ERU also sends some EEC discrete signals to the airplane.
Digital Interfaces
Digital data goes through the EDIU to the EEC. These are the components that have digital interfaces with the engine fuel control system:
* AIMS
EFFECTIVITY
BEJ ALL

*
Flaps slat electronic unit (FSEU)

*
Card files

*
Air supply-cabin pressure controller (ASCPC)

*
Overhead panel ARINC 629 system (OPAS).

AIMS
The AIMS transmits and receives a large amount of data to and from the EEC. This is a summary of the data and its function:
*
Bleed status -EEC thrust limit calculations

*
Air data -EEC thrust limit calculations

*
Engine data -sent to other airplane systems

*
Autothrottle EPR trim -thrust balancing

*
Condition monitoring -performance tracking

*
Maintenance data -troubleshooting

*
Engine parameters -indication.

FSEU
The FSEU supplies the EEC with flap position data for idle and ignition logic.
Card Files
The ACIPS card supplies anti-ice bleed status to the EEC. The HYDIM card supplies air driven pump status to the EEC anti-ice. The EEC uses the data to set engine idle speed.
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ENGINE FUEL CONTROL -AIRPLANE INTERFACES
　
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