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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-018
Elevators
The elevators attach to the rear spar of the horizontal stabilizer.
They control the pitch attitude of the airplane by up or down
movement.
Elevator Feel Computer
The elevator feel computer controls hydraulic pressure to the
elevator dual feel actuator. The feel computer gets inputs from
the horizontal stabilizer, pitot tubes, and hydraulic system A and
B.
Elevator Feel and Centering Unit
Feel force is provided by the feel and centering unit and the dual
feel actuator. Inputs to the feel and centering unit are provided
by the stabilizer, the flight control computers, and elevator feel
computer. The stabilizer inputs go through the elevator neutral
shift rods. The flight control computer inputs go through the
mach trim actuator. The elevator feel computer inputs go
through the dual feel actuator. The dual feel actuator adds a
variable feel force to the spring force in the feel and centering
unit.
Balance Panels and Tabs
The elevator balance panels and tabs use aerodynamic forces
to help decrease the force necessary to move the elevators in
flight.
Elevator Tab Control Mechanism
The elevator tab mechanism changes the function of the
elevator tab. When the TE flaps are up, the elevator tab
operates in the balance mode. When the TE flaps are not up, the
elevator tab operates in the anti-balance mode.
Elevator Neutral Shift - Stabilizer Input
The stabilizer moves two elevator neutral shift rods. The neutral
shift rods provide an input to the elevators through the mach
trim actuator, the feel and centering unit, and the elevator input
torque tube to the PCUs. When the elevator input torque tube
moves, it also backdrives the control cables which move the
control columns to their new neutral position.
Elevator Neutral Shift - Flight Control Computer Input
The flight control computers send signals to the mach trim
actuator. When the mach trim actuator moves, a mechanical
input goes through the feel and centering unit to the input torque
tube and PCUs. When the elevator input torque tube moves, it
also backdrives the control cables which move the control
columns to their new neutral position.
ELEVATOR AND TAB CONTROL SYSTEM - GENERAL DESCRIPTION 2
EFFECTIVITY
GUN ALL 27-31-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-018
ELEVATOR AND TAB CONTROL SYSTEM - GENERAL DESCRIPTION 2
ELEVATOR AND TAB CONTROL SYSTEM - GENERAL DESCRIPTION 2
EFFECTIVITY
GUN ALL 27-31-00
Page 13
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-018
General
The elevator components are in these six locations:
* Flight compartment
* Forward equipment compartment
* Empennage
* Vertical stabilizer
* Stabilizer jackscrew compartment
* Horizontal stabilizer.
Flight Compartment Components
These are the elevator components in the flight compartment:
* Control columns (2)
* FEEL DIFF PRESS light on the P5 forward overhead panel.
Forward Equipment Compartment Components
These are the elevator components in the forward equipment
compartment:
* Elevator forward control quadrants (2)
* Balance weights (2)
* Breakout mechanism.
Empennage Components
These are the elevator components in the empennage:
* Elevator aft control quadrants (2)
* Elevator input torque tube
* Elevator PCUs (2)
* Elevator output torque tube
* Elevator feel and centering unit
* Tab mechanism solenoid control valves (2).
Vertical Stabilizer Components
The feel system pitot tubes are in the vertical stabilizer.
Stabilizer Jackscrew Compartment Components
The elevator feel computer is in the stabilizer jackscrew
compartment.
Horizontal Stabilizer Components
These are the elevator components on the horizontal stabilizer:
* Elevators (2)
* Balance panels (6)
* Elevator tab control mechanisms (2)
* Elevator tabs (2).
ELEVATOR AND TAB CONTROL SYSTEM - COMPONENT LOCATION
EFFECTIVITY
GUN ALL 27-31-00
Page 14
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-003
ELEVATOR AND TAB CONTROL SYSTEM - COMPONENT LOCATION
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