General
There is one TLA resolver for each engine. The resolver supplies the EEC with an electrical signal in proportion to the thrust lever angular position.
Functional Description
The TLA resolver has two elements. Each channel of the EEC supplies a low-voltage, ac excitation signal to one element of the resolver. The feedback signal from the resolver to the EEC is in proportion to the thrust lever angular position.
The ASM brake turns the resolver with the resolver drive pin. The mechanical stop pin prevents too much ASM brake movement that can damage the resolver.
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PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
ENGINE CONTROLS -TLA RESOLVER
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ENGINE CONTROLS -FUEL CONTROL SWITCHES -FUNCTIONAL DESCRIPTION
General
Each fuel control switch controls a set of four relays in the ELMS. The relays control many functions. These are the relays:
*
A: reset/fuel spar
*
B: ignition/fire detection
*
C: generator control/ignition
*
D: EEC reset/IDG disconnect.
One electrical source supplies power to both coils of each relay. Each position of the fuel control switch supplies a ground for one coil of each relay.
A: Reset/Fuel Spar Relay
The reset/fuel spar relay controls these functions:
*
Fuel control switch position signal to the AIMS
*
EEC channel A reset signal
*
Fuel control switch position signal to the ELMS
*
Fuel spar valve control.
B: Ignition/Fire Detection Relay
The ignition/fire detection relay controls these functions:
*
EEC power control
*
Fuel control switch position signal to the engine data interface unit (EDIU)
*
Ignition 1 power
*
Fire switch lockout control.
C: Generator Control/Ignition Relay
The generator control/ignition relay controls these functions:
*
Engine relay unit (ERU) fuel control power
*
Fuel metering unit (FMU) cutoff solenoid power
*
Fuel control switch position signal to the generator control unit (GCU)
*
Ignition 2 power.
D: EEC Reset/IDG Disconnect Relay
The EEC reset/IDG disconnect relay controls these functions:
*
EEC channel B reset signal
*
IDG disconnect switch power.
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ENGINE CONTROLS -FUEL CONTROL SWITCHES -FUNCTIONAL DESCRIPTION
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