*
TLA -thrust lever angle
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PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
ENGINE CONTROLS -INTRODUCTION
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ENGINE CONTROLS -GENERAL DESCRIPTION
General
The engine controls system supplies manual and automatic control inputs to operate the engine. You use the thrust levers and fuel control switches to supply the manual inputs. The AIMS supplies the automatic inputs.
Thrust Control
The thrust levers supply thrust command signals to the electronic engine controls (EEC) through the TLA resolvers. Each thrust lever mechanically connects to a TLA resolver. When the thrust lever moves, it turns the TLA resolver. The EEC supplies power to excite the TLA resolver and reads the position of the resolver.
The thrust management function of the AIMS supplies automatic thrust command signals to the EEC with the TLA resolver. To do this, it turns the TLA resolver (and thrust lever) with the autothrottle servo motor (ASM). The ASM turns a brake that connects to the thrust lever and TLA resolver. See the autoflight chapter for more information on the ASM control (CHAPTER 22).
Fuel Control Switches
The fuel control switches control relays in the electrical load management system (ELMS). The relays control the start and stop functions of the engine.
Thrust Lever Switches
These are the thrust lever switches:
*
Takeoff/Go-around (TO/GA)
*
Autothrottle (A/T) disconnect
*
Thrust reverser (T/R) sync lock control valve.
See the autoflight chapter for more information on the TO/GA and A/T disconnect switches (CHAPTER 22).
See the engine exhaust chapter for more information on the T/R sync lock control valve switch (CHAPTER 78).
Switch Pack Switches
These are the switch pack switches:
*
T/R directional control valve
*
Autobrake inhibit.
See the engine exhaust chapter for more information on the T/R directional control valve pack switch (CHAPTER 78).
See the landing gear chapter for more information on the autobrake inhibit pack switch (CHAPTER 32).
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PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
ENGINE CONTROLS -GENERAL DESCRIPTION
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ENGINE CONTROLS -COMPONENT LOCATIONS
General
All of the engine controls components are at the P10 control stand in the flight deck. You get access to the components by removing panels, rails, or covers. These are the components:
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