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electric signal. This signal is sent to the EEC.
Clutch Pack
The clutch pack gives a friction connection between these
mechanisms:
* Thrust levers
* ASM and gearbox assembly.
The clutch lets the autothrottle system move the resolver and
the thrust levers. The clutch also gives a friction force to prevent
the free movement of the thrust levers, but lets the pilot move
the thrust levers independent of the autothrottle system.
See the autoflight chapter for more information on the
autothrottle system. (CHAPTER 22)
Autothrottle Switch Packs
There are two autothrottle switch packs, one for each thrust
lever assembly. Each thrust lever assembly drives a switch
pack through a mechanical linkage. Each switch pack has nine
switches which supply discrete thrust lever position signals to
various systems. These are the switches and the function of
each switch:
* S1 - auto ground speedbrake control and landing gear
warning
* S2 - autobrake system
* S3 - autobrake system
* S4 - engine thrust reverser synchronous shaft locks
* S5 - engine thrust reverser control
* S6 - engine thrust reverser control
* S7 - wing thermal anti-ice system
* S8 - aural warning - takeoff warning and weather radar
* S9 - landing gear warning.
Autothrottle Servomotor (ASM) and Gearbox Assembly
The thrust management function of the autothrottle system
supplies the thrust command signal to the EEC. To do this, the
ASM and gearbox assembly drives the TLA resolvers and the
thrust levers through the clutch pack.
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See the autoflight chapter for more information on the ASM and
gearbox assembly and on the autothrottle system.
(CHAPTER 22)
Takeoff/Go-Around (TO/GA) and Autothrottle Disengage
Switches
A TO/GA switch and an autothrottle disengage switch are in
each thrust lever assembly. The TO/GA switch lets the pilot set
the TO/GA function. The autothrottle disengage switch lets the
pilot disengage the autothrottle function. The command buttons
for these switches are just under and on the forward thrust lever
knob.
See the autoflight chapter for more information on the goaround
and autothrottle switches. (CHAPTER 22)
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General
The thrust levers and the resolvers in the autothrottle assembly
work together to supply a thrust command to the EEC. The
autothrottle system makes the automatic inputs. You use the
thrust levers to make the manual inputs.
Thrust Lever
There are two thrust lever assemblies, one for each engine. A
thrust lever assembly has many parts. These parts
mechanically transmit the thrust command to the resolver:
* Forward thrust lever
* Reverse thrust lever
* Control link
* Crank
* Rod.
These parts operate the crank:
* Forward thrust lever
* Reverse thrust lever
* control link.
The crank connects with the clutch pack and the resolver in the
autothrottle assembly through the rod. The forward thrust lever
and the crank are on the same shaft, but they move
independently. The forward thrust lever holds the reverse
thrust lever. The control link directly connects the reverse thrust
lever and the crank. The control link moves up when you raise
the reverse thrust lever. The control link moves down when you
move the forward thrust lever forward.
When you move the forward thrust lever, the position of the
reverse thrust lever locks the control link onto the forward thrust
lever. The force goes to the crank through the control link.
　
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