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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
76-00-00-030
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)
ENGINE CONTROLS - INTERFACES
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
76-00-00-030
ENGINE CONTROLS - INTERFACES
ENGINE CONTROLS - INTERFACES
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
76-00-00-030
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ENGINE CONTROLS - INTERFACES
76-00-00
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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.
When you move the reverse thrust lever, the force goes to the
crank through the control link.
The thrust lever lock pawl prevents the operation of the forward
thrust lever and the reverse thrust lever at the same time. The
pawl must move into a hole on the control stand web for the
reverse thrust lever to move. The pawl can move into the hole
only when the forward thrust lever is in the idle position.
When the forward thrust lever is not at idle, the pawl locks the
reverse thrust lever at the STOW position. This prevents the
movement of the reverse thrust lever when the forward thrust
lever is not in the idle position.
ENGINE CONTROLS - THRUST LEVER
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
76-00-00-040
When the forward thrust lever is at idle, the pawl unlocks the
reverse thrust lever. You can move the reverse thrust lever. If
you move it, the pawl locks the forward thrust lever.
Training Information Point
You adjust the length of the rod to change the relationship
between the thrust lever position and the resolver position.
Refer to the airplane maintenance manuel (AMM) part II for
more information on this procedure.
You measure the friction force to move the thrust levers to make
sure the force is within limits. Refer to the Fault Isolation
Manual for more information on this procedure.
ENGINE CONTROLS - THRUST LEVER
EFFECTIVITY
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