PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
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ENGINE CONTROLS -OPERATION
Controls
You use many flight deck controls and displays with the engine controls system to operate the engine. These are the controls and displays and the ATA chapters where you find the details on them:
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Thrust levers (76)
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Fuel control switches (76)
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EEC maintenance switches (73)
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EEC mode switches (73)
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Start/Ignition switches (74,80)
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Autostart switch (80)
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Fire switches (26)
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EICAS display (77)
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Multi-function display (MFD) (73,75,76,77,78,79,80).
Thrust Lever (76)
Each thrust lever mechanically moves its TLA resolver. The resolver sends the EEC a signal in proportion to the angular position of the thrust lever. This permits the EEC to set the proper thrust.
Fuel Control Switch (76)
Each fuel control switch has two positions; RUN and CUTOFF. In RUN, the switch signals the EEC to turn on fuel. The EEC makes the decision when to turn on fuel. In CUTOFF, the switch controls the FMU to shut off metered fuel flow to the injectors. It also makes the engine fuel spar valve close. See chapter 28 for more information on the engine spar valve.
EFFECTIVITY
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In addition, when you move the fuel control switch from RUN to CUTOFF, the EEC resets. This stops the software programs in the EEC and sets them to run from the start.
EEC Maintenance Switch (73)
Each EEC maintenance switch has two positions; NORM and TEST. In NORM, the switch lets EEC power come from normal operating power sources. In TEST, the switch connects airplane ac power to the EEC without starting any EEC control logic.
EEC Mode Switch (73)
Each EEC mode switch lets the pilots set the EEC control mode: normal (EPR) or alternate (N1). You should always operate both engines in the same control mode.
Start/Ignition Switches (74,80)
You use the start/ignition switch to begin the start of the engine. It also lets you select continuous ignition on the engine.
Autostart Switch (80)
The autostart switch permits the EEC to automatically control engine starts.
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ENGINE CONTROLS -OPERATION
Fire Switch (26)
The fire switch permits FMU control power to go to the engine relay unit (ERU) when the switch is in its normal position (in). If the switch is pulled out, power connects directly to the FMU cutoff solenoid to stop metered fuel flow to the injectors. engine. It also makes the engine fuel spar valve close. See chapter 28 for more information on engine spar valve operation.
EICAS Display (77)
The EICAS display shows the primary engine indications. These are EPR, N1, and EGT.
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