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upper 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. This moves the actuator housing and the respective
aileron body quadrant to the commanded position. The other
side of the actuator is connected to return.
AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON POWER CONTROL UNIT
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-11-00-009
System Pressure Failure
If one PCU cannot supply hydraulic pressure, 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 control wheel, the ON side PCU still moves to its
commanded position normally. As the ON side PCU moves it
also moves its respective aileron body quadrant and back
drives the OFF side PCU actuator housing. When the OFF side
housing moves, hydraulic fluid is pushed from one side of the
actuator to the other through the bypass valve.
Rate Jam
If one PCU input pogo cannot move freely, then the pilot must
supply approximately 20 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 aileron body quadrant assembly
normally. As the ON side PCU moves its respective aileron
body quadrant 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.
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 control wheel more
than three degrees, 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 aileron body quadrant assembly to the
commanded position.
Training Information Point
The two aileron PCUs are identical and interchangeable with
the elevator PCUs.
AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON POWER CONTROL UNIT
EFFECTIVITY
GUN ALL 27-11-00
Page 30
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-11-00-009
AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON POWER CONTROL UNIT
AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON POWER CONTROL UNIT
EFFECTIVITY
GUN ALL 27-11-00
Page 31
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-11-00-009
Purpose
The aileron body quadrants move the wing cables to control the
aileron position.
Location
The body quadrants are on the forward bulkhead of the main
landing gear wheel well.
Physical Description
Each aileron body quadrant connects to one crankshaft. The
PCU housing connects through a crank to the related
crankshaft.
Three shear rivets connect each quadrant and the related
output shaft.
The cables from the upper quadrant connect to the right wing
quadrant. The cables from the lower quadrant connect to the left
wing quadrant.
A fork and lug assembly connects the upper and lower
quadrants.
Functional Description
The PCU housing moves the crankshaft through the crank. This
moves the body quadrant and the related aileron.
If one hydraulic system is OFF, the other system PCU moves the
two quadrants through the fork and lug assembly.
If one body quadrant cannot move, the related system PCU
moves its crankshaft and shears the three shear rivets. Now
both PCUs and crankshafts still can move but input to the
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