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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
27-21-00-007
RUDDER AND RUDDER TRIM CONTROL SYSTEM - MAIN RUDDER POWER CONTROL UNIT
RUDDER AND RUDDER TRIM CONTROL SYSTEM - MAIN RUDDER POWER CONTROL UNIT
EFFECTIVITY
GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB 737-27-1253 27-21-00
Page 30
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-21-00-007
Physical Description
The PCU housing contains:
* Tandem actuator
* Bypass valve (2)
GUN 001-005, 201-999 PRE SB 737-27-1253
* Control valve
GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB
737-27-1253
* Control valve (2)
GUN ALL
* Inlet Filter (2)
* Yaw damper actuator
* Yaw damper LVDT
* Yaw damper solenoid valve
* Yaw damper EHSV
GUN 001-005, 201-999 PRE SB 737-27-1253
* Load limit relief valve
* Authority limiter solenoid valve.
GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB
737-27-1253
* Authority limiter solenoid valve (2).
GUN ALL
Functional Description
When each hydraulic system pressure is on, hydraulic pressure
moves each bypass valve to the bypass position. Pressure from
system A and system B goes to the control valve. When the pilot
gives an input to the rudder system, the control valve moves
and sends pressure to the tandem actuator. This moves the
PCU piston and the rudder.
The summing lever resets the control valve when the rudder
moves to the selected position.
When hydraulic system A or B pressure is removed, the
associated bypass valve moves to the bypass position. This
connects both sides of the piston, prevents a hydraulic lock, and
lets the hydraulic system with pressure move the actuator.
GUN 001-005, 201-999 PRE SB 737-27-1253
The relief valves open when the pilot input backdrives the yaw
damper actuator. This prevents a hydraulic lock and possible
damage to the internal linkage in the PCU.
GUN ALL
RUDDER AND RUDDER TRIM CONTROL SYSTEM - MAIN RUDDER PCU - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 27-21-00
Page 31
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-21-00-012
Load Limiter
GUN 001-005, 201-999 PRE SB 737-27-1253
The load limiter function limits rudder authority when the
airspeed is more than 137 knots. When the load limiter solenoid
valve energizes, it sends pressure to the lock pistons in the load
limit relief valve. The lock pistons move and release the
modulating valve. The modulating valve reduces system A
pressure to the actuator to 1450 psi. The rudder output force is
now 25% less which reduces rudder for any specific blowdown
airspeed.
GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB
737-27-1253
The load limiter function limits rudder authority when the
airspeed is more than 137 knots. When the load limiter solenoid
valves energize, it sends pressure to the lock pistons in the load
limit relief valve. The lock pistons move and release the
modulating valve. The modulating valve reduces the working
pressure to both the A and B pistons to 2200 psi. The rudder
output force is now 25% less which reduces rudder authority at
blowdown.
GUN ALL
Yaw Damper
When engaged, the yaw damper system gives input to the main
PCU yaw damper solenoid valve. The solenoid valve moves
and sends pressure from system B to the electrohydraulic
servo valve (EHSV). When the EHSV moves, it sends pressure
to move the yaw damper actuator. The yaw damper actuator
input mechanically adds to the pilot input. Then the control
valve moves and sends pressure to the tandem actuator. This
moves the PCU piston and the rudder. Rudder input from the
yaw damper does not back drive the rudder pedals. See the
yaw damper system section for more information.
(SECTION 22-23)
RUDDER AND RUDDER TRIM CONTROL SYSTEM - MAIN RUDDER PCU - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 27-21-00
Page 32
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-21-00-012
RUDDER CONTROL SYSTEM - MAIN RUDDER PCU - FUNCTIONAL DESCRIPTION
RUDDER AND RUDDER TRIM CONTROL SYSTEM - MAIN RUDDER PCU - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-005, 201-999 PRE SB 737-27-1253 27-21-00
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