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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-006
System Pressure Failure
If one PCU cannot supply hydraulic pressure, then its bypass
valve moves to the bypass position. This connects the two sides
of the actuator, and prevents a hydraulic lock condition. When
the pilot moves the elevator control column, the ON side PCU
still moves to its commanded position normally. As the ON side
PCU moves the output torque tube, it also back drives the OFF
side PCU actuator housing. When the OFF side housing moves,
hydraulic fluid is pushed from one side to the other through the
bypass valve.
Rate Jam
If one PCU input pogo cannot move freely, then the pilot must
supply approximately 30 pounds of additional force to compress
or extend a spring inside the pogo. The other PCU input pogo
still moves its respective input crank and slide to the
commanded position. This equalizes pressure on both sides
of the actuator and prevents a hydraulic lock condition. Now the
other PCU can move the output torque tube normally. As the ON
side PCU moves the output torque tube, it also back drives the
OFF side PCU actuator housing. When the OFF side housing
moves, hydraulic fluid is pushed from one side to the other
through the control valve.
Manual Reversion
During a manual reversion, the bypass valve receives no
hydraulic pressure and moves to the bypass position. This
connects the two sides of the actuator and prevents a hydraulic
lock condition. When the pilot moves the elevator control
column more than one degree, the primary and secondary input
cranks hit mechanical stops on the outside of the actuator
housing. As the housing moves, hydraulic fluid in the actuator is
pushed from one side to the other through the bypass valve.
Movement of the housing also moves the output torque tube to
the commanded position.
Training Information Point
The elevator PCUs are interchangeable with each other and
with the aileron PCUs.
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR POWER CONTROL UNIT
EFFECTIVITY
GUN ALL 27-31-00
Page 26
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-006
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR POWER CONTROL UNIT
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR POWER CONTROL UNIT
EFFECTIVITY
GUN ALL 27-31-00
Page 27
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-006
Purpose
The elevator output torque tube transmits the motion of the
elevator PCUs to the elevators.
Location
The elevator output torque tube is the torque tube at the top of
the elevator components in the empennage.
Physical Description
The elevator output torque tube has these components:
* Outer torque tube
* Inner torque tubes (2)
* Elevator bus crank.
The elevator output torque tube connects with the two elevator
PCUs. It also connects to both elevators through elevator
control rods.
Functional Description
The elevator output torque tube receives inputs from the two
elevator PCUs. When one or both of the PCUs move, they move
the torque tube and both elevators.
The elevator bus crank operates the elevators if an inner torque
tube breaks.
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR OUTPUT TORQUE TUBE
EFFECTIVITY
GUN ALL 27-31-00
Page 28
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-007
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR OUTPUT TORQUE TUBE
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR OUTPUT TORQUE TUBE
EFFECTIVITY
GUN ALL 27-31-00
Page 29
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-007
Purpose
The elevators control the pitch attitude of the airplane around
the lateral axis.
Location
The elevators attach to the rear spar of the horizontal stabilizer.
Physical Description
The elevator assembly contains these components:
* Elevator
* Elevator balance panels (3)
* Elevator balance weights
* Elevator tab rods
* Elevator tab
* Elevator tab control mechanism.
The elevators connect with hinges to the aft right and left
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