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about the FDAU. (SECTION 31-31)
The rudder trim indicator shows the amount of trim in units. A
screw located on the back of the indicator is used for
adjustment.
If there is electric failure to the trim indication, an OFF flag
shows. When the rudder trim indicator fails the trim function is
still available.
Training Information Point
There must be hydraulic pressure to the PCUs for the trim input
to move the rudder.
RUDDER AND RUDDER TRIM CONTROL SYSTEM - RUDDER TRIM ACTUATOR
EFFECTIVITY
GUN ALL 27-21-00
Page 24
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-21-00-011
RUDDER AND RUDDER TRIM CONTROL SYSTEM - RUDDER TRIM ACTUATOR
RUDDER AND RUDDER TRIM CONTROL SYSTEM - RUDDER TRIM ACTUATOR
EFFECTIVITY
GUN ALL 27-21-00
Page 25
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-21-00-011
THIS PAGE IS INTENTIONALLY LEFT BLANK
RUDDER AND RUDDER TRIM CONTROL SYSTEM - RUDDER TRIM ACTUATOR
27-21-00
Page 26
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The main rudder power control unit (PCU) uses hydraulic power
to move the rudder.
Location
The main rudder PCU is above the rudder feel and centering
unit in the vertical stabilizer. To get access to the PCU, remove
the panel on the left side of the vertical fin.
Physical Description
The PCU has these parts:
* Housing connected to structure
* Piston connected to the rudder
* Input and summing cranks
* Yaw damper solenoid valve
* Yaw damper EHSV
GUN 001-005, 201-999 PRE SB 737-27-1253
* Load limiter solenoid valve.
GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB
737-27-1253
* Load limiter solenoid valves.
GUN ALL
Functional Description
When the pilot moves the rudder pedals, the rudder input rod
moves. This moves the external summing lever and the input
crank. This causes the PCU piston to move the rudder. As the
PCU piston moves, the summing lever moves the input crank to
null out the input. This stops the PCU movement at the
commanded position.
The yaw damper solenoid valve sends pressure to the yaw
damper EHSV when the yaw damper system is engaged.
The yaw damper EHSV sends pressure to move the yaw
damper actuator when the yaw damper system is engaged.
GUN 001-005, 201-999 PRE SB 737-27-1253
When energized, the load limiter solenoid valve sends pressure
to the load limit relief valve.
GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB
737-27-1253
When energized, the load limiter solenoid valves send
hydraulic pilot pressure to the respective load limit relief valves.
RUDDER AND RUDDER TRIM CONTROL SYSTEM - MAIN RUDDER POWER CONTROL UNIT
EFFECTIVITY
GUN ALL 27-21-00
Page 27
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
GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB 737-
27-1253 (Continued)
GUN 001-005, 201-999 PRE SB 737-27-1253
The force fight monitor (FFM) finds opposite pressure on the A
and B sides of the tandem actuator. The FFM output pressure
pressurizes the standby PCU.
GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB
737-27-1253
The force fight monitor (FFM) finds opposite pressure on the A
and B sides of the tandem actuator. The FFM commands
pressure to the standby PCU when the FFM sends a force fight
signal to the P5-3 panel. See the standby hydraulic operation
section of the AMM 29-22 for more information about the
standby system. The FFM also commands the STBY RUD ON
light (P5-3 panel) ON.
GUN ALL
Maintenance Tip
A combination of different hose lengths and union coupling
sizes prevents cross connection of hydraulic hoses.
RUDDER AND RUDDER TRIM CONTROL SYSTEM - MAIN RUDDER POWER CONTROL UNIT
EFFECTIVITY
GUN ALL 27-21-00
Page 28
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
RUDDER AND RUDDER TRIM CONTROL SYSTEM - MAIN RUDDER POWER CONTROL UNIT
RUDDER AND RUDDER TRIM CONTROL SYSTEM - MAIN RUDDER POWER CONTROL UNIT
EFFECTIVITY
GUN 001-005, 201-999 PRE SB 737-27-1253 27-21-00
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