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Thrust lever switches
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Thrust levers
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Fuel control switches
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TLA resolvers
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Autothrottle servo motors.
See the autoflight chapter for more information on the autothrottle servo motors (CHAPTER 22).
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PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
ENGINE CONTROLS -COMPONENT LOCATIONS
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ENGINE CONTROLS -SWITCHES -COMPONENT LOCATIONS
General
The thrust levers contain removable control switches. You remove covers to get access to the switches.
Thrust Lever Switches
Four switches attach to the sides of each thrust lever. The TO/ GA switches are on the outboard side. The T/R sync lock switch is on the inboard side. The TO/GA trigger moves the TO/GA switches. The reverse thrust lever moves the T/R sync lock switch.
The A/T disconnect switch is in the handle of the forward thrust lever.
Switch Pack
The switch pack is in the forward part of the control stand. It contains six switches. Each thrust lever moves a plunger in the switch pack to operate three of the switches. You can remove and install the pack as an assembly or replace an individual switch. You must use a soldering iron to replace an individual switch. These are the switches:
*
S1 -autobrake inhibit left 1
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S2 -autobrake inhibit left 2
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S3 -autobrake inhibit right 1
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S4 -autobrake inhibit right 2
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S5 -T/R directional control solenoid valve left
*
S6 -T/R directional control solenoid valve right.
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ENGINE CONTROLS -SWITCHES -COMPONENT LOCATIONS
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PW4000 SERIES ENGINES
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ENGINE CONTROLS -THRUST LEVER & AUTOTHROTTLE ASSEMBLY -FUNCTIONAL DESCRIPTION
General
The thrust lever and autothrottle assembly work together to supply thrust commands to the EEC. You use the thrust levers to make manual inputs. The autothrottle servo motor (ASM) makes automatic inputs.
Thrust Lever
The thrust lever is one assembly with many pieces. These pieces mechanically transmit the thrust lever commands to the autothrottle assembly:
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Reverse thrust lever
*
Forward thrust lever
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Thrust lever crank
*
Lever latch
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