PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
ENGINE FUEL CONTROL -ERU
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ENGINE FUEL CONTROL -EDIU
General
The EDIU changes the ARINC 429 formatted data of the EEC to ARINC 629, and airplane 629 to 429. This permits the EEC to transmit and receive data to and from airplane systems. Each engine has its own EDIU.
Each EDIU also gets an analog N1 signal from the EEC for thrust asymmetry compensation calculations. The data goes to the AIMS.
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PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
ENGINE FUEL CONTROL -EDIU
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ENGINE FUEL CONTROL -EDIU -FUNCTIONAL DESCRIPTION
General
The EDIU controls data flow between the airplane and the engine.
EDIU
The EDIU is a three-channel data converter (changes data). Each channel has two data conversion circuits. Two channels (A and B) receive and transmit both ARINC 429 and 629 data. The center channel (C) only receives ARINC 429 data and transmits ARINC 629 data.
Two different dc power sources power each channel of the EDIU.
ARINC 629 Interfaces
The left EDIU channels A and B transmit and receive on the left, center 1, and center 2 systems ARINC 629 buses. Channel C transmits on the center 1 and center 2 buses.
The right EDIU channels A and B transmit and receive on the right, center 1, and center 2 systems ARINC 629 buses. Channel C transmits on the center 1 and center 2 buses.
ARINC 429 Interfaces
Each EEC channel has two ARINC 429 data ports. This permits the EDIU channels A and B to talk to both EEC channels.
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ENGINE FUEL CONTROL -EDIU -FUNCTIONAL DESCRIPTION
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PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
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ENGINE FUEL CONTROL -OPERATION
Controls
You operate the engine fuel and control system with these flight deck controls:
*
EEC maintenance switch
*
EEC mode switch
*
Thrust lever
*
Fuel control switch
*
Fire switch.
EEC Maintenance Switch
The EEC maintenance switch is on the P61 overhead maintenance panel. The switch is a two-position, guarded, toggle switch.
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