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through these components:
* Forward quadrants
* Control cables
* Aft quadrant and output rod
* Feel and centering unit
* Main rudder PCU.
The aft quadrant output rod also has an integral rudder pedal
force transducer. The force transducer sends signals to the
flight data acquisition unit proportional to rudder pedal forces.
See the flight data recorder system section for more information
about the rudder pedal force transducer. (SECTION 31-31)
Movement of the feel and centering unit also backdrives the
rudder pedals through the rudder control system. Rudder PCU
movement moves the rudder and the rudder position
transmitter. The rudder position transmitter sends signals to
the flight data acquisition unit (FDAU) for rudder position.
See the flight data recorder system section for more information
about the rudder position transmitter and FDAU.
(SECTION 31-31)
Manual Operation - Rudder Trim
The rudder trim control knob and the trim actuator let the flight
crew trim out unwanted rudder pedal forces. When the pilot
moves the rudder trim control knob on the aisle stand, the
control sends signals to the rudder trim actuator and the FDAU.
The rudder trim actuator moves the feel and centering unit
which creates an input to the rudder PCUs. The rudder trim
actuator also sends signals to the rudder position indicator on
the aisle stand above the rudder trim control knob.
Yaw Damper
The yaw damper keeps the airplane stable around the vertical
axis. When engaged, the yaw damper system gives input to the
main or the standby rudder PCUs. During normal operation,
SMYD 1 controls the rudder through the main rudder PCU.
During manual reversion, SMYD 2 controls the rudder through
the standby rudder PCU.
See the yaw damper system section for more information about
yaw damper. (SECTION 22-23)
See the stall management yaw damper system section for more
information about stall management yaw damper.
(SECTION 27-32)
RUDDER AND RUDDER TRIM CONTROL SYSTEM - GENERAL DESCRIPTION 1
EFFECTIVITY
GUN ALL 27-21-00
Page 5
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-21-00-002
Wheel-To-Rudder Interconnect System (WTRIS)
The WTRIS system helps lateral control during manual
reversion turns. The WTRIS system provides a small amount
of rudder movement in response to control wheel inputs. When
engaged, the WTRIS system gives input to the standby rudder
PCU.
See the wheel-to-rudder interconnect system section for more
information. (SECTION 27-24)
GUN 001-005, 201-999 PRE SB 737-27-1253
Authority Limiter
The authority limiter reduces the maximum rudder movement.
At specified air speeds, the FSEU opens the main rudder PCU
authority limiter solenoid valve. This limits hydraulic system A
pressure to the PCU, which limits the rudder authority.
GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB
737-27-1253
Authority Limiter
The authority limiter reduces the maximum rudder movement.
At specified air speeds, the FSEU opens the main rudder PCU
authority limiter solenoid valve. This limits the hydraulic force
produced by the PCU, which limits the rudder authority.
GUN ALL
RUDDER AND RUDDER TRIM CONTROL SYSTEM - GENERAL DESCRIPTION 1
EFFECTIVITY
GUN ALL 27-21-00
Page 6
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-21-00-002
RUDDER AND RUDDER TRIM CONTROL SYSTEM - GENERAL DESCRIPTION 1
RUDDER AND RUDDER TRIM CONTROL SYSTEM - GENERAL DESCRIPTION 1
EFFECTIVITY
GUN ALL 27-21-00
Page 7
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-21-00-002
General
These are the components of the rudder control system:
* Rudder pedals (4) and forward quadrants (2)
* RA and RB; left and right rudder control cables
* Rudder aft control quadrant
* Rudder feel and centering unit
* Main rudder power control unit
* Standby rudder power control unit
* Rudder.
Rudder Pedals and Forward Quadrants
The rudder pedals move the forward control rods and bus rods,
which move the rudder forward quadrants.
Rudder Control Cables
The rudder forward quadrants move the RA and RB rudder
control cables. The cables move the rudder aft control quadrant.
Rudder Aft Control Quadrant
The aft control quadrant moves the rudder quadrant output rod,
　
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