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and the attached cables. The cables move and control the
position of the input torque tube through the elevator aft control
quadrants. When the input torque tube moves, it gives an input
to the PCUs. The PCU housing moves and controls the elevator
position.
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR CABLE SYSTEM
EFFECTIVITY
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EFFECTIVITY
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Purpose
The elevator input torque tube transmits elevator inputs to the
elevator PCUs.
Location
The elevator input torque tube is the bottom of the two elevator
torque tubes in the empennage.
Physical Description
The elevator input torque tube has these components:
* Elevator aft control quadrants (2)
* Autopilot input crank
* Elevator feel and centering unit crank
* Elevator PCU input cranks (4).
Functional Description
The elevator input torque tube receives these inputs:
* Pilot inputs through the elevator aft control quadrants
* Autopilot inputs through the elevator autopilot actuator input
crank
* Stabilizer position through the elevator feel and centering
unit
* Mach trim actuator position through the elevator feel and
centering unit.
When the elevator aft control quadrants move, they move the
elevator input torque tube. This moves the elevator PCU input
pogos.
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR INPUT TORQUE TUBE
EFFECTIVITY
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ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR INPUT TORQUE TUBE
EFFECTIVITY
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ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR INPUT TORQUE TUBE
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The elevator power control units (PCUs) use hydraulic power to
move the elevators.
Location
The two elevator PCUs are on the empennage wall. The right
PCU gets system B pressure and the left PCU gets system A
pressure.
Physical Description
The elevator PCU has these parts:
* Movable housing connected to the output torque tube
* Fixed piston connected to structure.
The elevator PCU housing contains:
* Main Actuator
* Filter
* Bypass valve
* Main Control valve
* Primary and a secondary input cranks
* External mechanical stops (2).
Functional Description
The elevators move when any of the these conditions occur:
* Normal operation
* System pressure failure
* Rate jam
* Manual reversion.
Normal Operation
During normal operation, an elevator input goes through the
input torque tube and to the input pogos of each PCU. Left and
right input cranks on the PCU move slides in the control valve
and supply hydraulic pressure to the actuator.
The left input crank connects to the primary slide and the right
input crank connects to the secondary slide. A torsion spring
inside the PCU connects the two input cranks. Movement of the
primary slide supplies one-half the total flow rate, and
movement of the secondary slide supplies the other half. The
primary slide moves to its full effective stroke before the
secondary crank starts to move the secondary slide.
When the primary and secondary slides move, hydraulic
pressure goes through the control valve to one side of the
actuator. The other side of the actuator is connected to return.
This moves the actuator housing and the output torque tube to
the commanded position.
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR POWER CONTROL UNIT
EFFECTIVITY
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