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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-002
THRUST REVERSER CONTROL SYSTEM - COMPONENT LOCATIONS
THRUST REVERSER CONTROL SYSTEM - COMPONENT LOCATIONS
EFFECTIVITY
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Page 9
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-002
Purpose
The arm and stow switches control the arm and deploy signals
to the T/R control system. The system uses these signals to
control hydraulic power to the T/R.
The sync lock switches control power to the circuits which
control sync lock power.
Location
All of the switches are in the autothrottle (A/T) switch packs,
below the flight compartment aisle stand. There are two switch
packs. The switch packs are between the two A/T servo
mechanisms.
You go through the lower nose compartment access door to get
access to the A/T switch packs. You must remove the A/T pack
to get access to any of the switches.
General
The arm switch supplies electrical power to the arm solenoid in
the thrust reverser (T/R) control valve module. There are two
arm switches. One switch for each T/R.
The stow switch supplies power to the engine accessory unit
(EAU) stow logic circuits. There are two stow switches. One
switch for each T/R.
The sync lock switch supplies power to the T/R sync lock
circuits. There are two sync lock switches. One switch for each
T/R.
Functional Description
The thrust lever rod moves when you move its reverse thrust
lever. This movement transmits through a series of linkages to
turn the crank.
The A/T switch pack cam turns with the crank. Movement of the
cam operates the switches.
THRUST REVERSER CONTROL SYSTEM - ARM, STOW AND SYNC LOCK SWITCHES
EFFECTIVITY
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Page 10
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-003
THRUST REVERSER CONTROL SYSTEM - ARM, STOW AND SYNC LOCK SWITCHES
THRUST REVERSER CONTROL SYSTEM - ARM, STOW AND SYNC LOCK SWITCHES
EFFECTIVITY
GUN ALL 78-34-00
Page 11
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-003
Purpose
The control switch supplies electrical power to the deploy
solenoid in the T/R control valve module during a T/R deploy
operation. There are two control switches, one for each T/R.
See the functional description part of this section for more
information about how the T/R control system uses the control
switches.
Location
The control switches are in the thrust levers. Each thrust lever
has one switch. You must remove the cover on the side of the
thrust lever to get access to the switch.
Functional Description
The thrust lever camshaft turns when you move the reverse
thrust lever. The camshaft causes the roller assembly and rod
to move down when you raise the reverse thrust lever. The
control switch spring compresses and operates the control
switch.
The spring around the rod keeps the rod and the roller
assembly against the cam. The rod and the roller move back to
their normal position when you lower the reverse thrust lever.
The control switch spring relaxes and the switch moves back to
the stow position.
THRUST REVERSER CONTROL SYSTEM - CONTROL SWITCH
EFFECTIVITY
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Page 12
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-004
THRUST REVERSER CONTROL SYSTEM - CONTROL SWITCH
THRUST REVERSER CONTROL SYSTEM - CONTROL SWITCH
EFFECTIVITY
GUN ALL 78-34-00
Page 13
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-004
Purpose
The thrust reverser sleeve lock proximity sensor supplies a
hydraulic actuator lock/unlock signal to the engine accessory
unit (EAU).
The EAU uses this signal for these functions:
* Normal T/R stow control
* Auto-restow control
* Fault logic and fault indication
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