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(SECTION 78-31)
See the autoflight chapter for more information on the
autothrottle system. (CHAPTER 22)
ENGINE CONTROLS - GENERAL DESCRIPTION
EFFECTIVITY
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ENGINE CONTROLS - GENERAL DESCRIPTION
ENGINE CONTROLS - GENERAL DESCRIPTION
EFFECTIVITY
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Component Locations
The thrust levers and the start levers are on the control stand in
the flight compartment. You remove panels from the aisle stand
to get access to these components:
* Start lever switches
* Interlock latch
* Thrust lever cranks and rods.
The reverse thrust interlock solenoids and thrust lever
resolvers are in the autothrottle assembly. The autothrottle
assembly is under the flight compartment floor in the forward
equipment compartment. You go into the forward equipment
compartment through the access door, forward of the nose
landing gear.
See the autothrottle section for more information on the
autothrottle assembly. (SECTION 22-31)
ENGINE CONTROLS - COMPONENT LOCATION
EFFECTIVITY
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EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
These equipment and mechanisms related to the engine control
system are on the control stand and below the flight
compartment floor in the autothrottle assembly:
* Resolvers
* Clutch pack
* Autothrottle switch packs
* Autothrottle servomotor (ASM) and gearbox assembly
* Take off/go-around (TO/GA) switches and autothrottle
disengage switches.
Resolvers
There are two resolver assemblies, one for each engine. Each
thrust lever assembly drives a resolver. The resolver changes
the forward and reverse thrust lever positions to an analog
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.
ENGINE CONTROLS - INTERFACES
EFFECTIVITY
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