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GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB 737-27-1253 27-21-00
Page 18
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-21-00-005
THIS PAGE IS INTENTIONALLY LEFT BLANK
RUDDER AND RUDDER TRIM CONTROL SYSTEM - AFT RUDDER CONTROL COMPONENTS
27-21-00
Page 19
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The rudder feel and centering unit gives artificial feel to the
rudder pedals, centers the input to the PCU, and transmits trim
inputs to the aft control components.
Location
The rudder feel and centering unit is in the vertical stabilizer on
the bottom of the torque tube.
Physical Description
The rudder feel and centering unit has these components:
* Support shaft
* Crank
* Frame
* Spring (2)
* Cam
* Roller
* Roller arm.
The cam attaches to the shaft with bolts. A cam roller attaches
to the roller arm which attaches to the support. The two springs
connect the roller arm with the support.
The rudder trim actuator connects to a fixed bracket and the
frame. The trim actuator is a 115v ac, 400Hz single phase,
reversible motor. The motor has limit switches, mechanical
stops at the stroke ends, and a brake to limit overcoast.
Functional Description
The centering springs hold the roller in the center of the cam.
When the rudder pedals move, the cam turns with the shaft and
moves the roller up on the cam. This compresses the springs
and supplies feel force to the pilot.
When the pilots release the rudder pedals, the spring force
causes the roller to move to the cam detent. The system is now
at the neutral trim position.
During trim operation, the electrical trim actuator piston moves
the frame. The springs keep the roller in the center of the cam
and thus the shaft and crank will backdrive the torque tube. This
gives an input to the rudder PCUs to move the rudder. It also
moves the rudder pedals and supplies rudder trim indication on
the P8 control stand.
RUDDER AND RUDDER TRIM CONTROL SYSTEM - RUDDER FEEL AND CENTERING UNIT
EFFECTIVITY
GUN ALL 27-21-00
Page 20
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-21-00-006
RUDDER AND RUDDER TRIM CONTROL SYSTEM - RUDDER FEEL AND CENTERING UNIT
RUDDER AND RUDDER TRIM CONTROL SYSTEM - RUDDER FEEL AND CENTERING UNIT
EFFECTIVITY
GUN 001-005, 201-999 PRE SB 737-27-1253 27-21-00
Page 21
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-21-00-006
RUDDER AND RUDDER TRIM CONTROL SYSTEM - RUDDER FEEL AND CENTERING UNIT
RUDDER AND RUDDER TRIM CONTROL SYSTEM - RUDDER FEEL AND CENTERING UNIT
EFFECTIVITY
GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB 737-27-1253 27-21-00
Page 22
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-21-00-006
THIS PAGE IS INTENTIONALLY LEFT BLANK
RUDDER AND RUDDER TRIM CONTROL SYSTEM - RUDDER FEEL AND CENTERING UNIT
27-21-00
Page 23
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The rudder trim control operates the electrical trim actuator.
The trim actuator changes the neutral position of the rudder and
the rudder pedals.
Location
The rudder trim control knob and indicator are on the aileron/
rudder trim panel.
The rudder trim actuator is in the vertical stabilizer connected to
the rudder feel and centering unit.
Physical Description
The rudder trim control knob operates the two rudder trim
switches. They are part of the aileron/rudder trim panel.
Functional Description
The pilot controls the rudder trim with the rudder trim control
knob. The switches control the rudder trim actuator.
The rudder trim can operate at all times when electrical power
is available. There are two switches internal to the control. One
switch connects to supply power, controls rudder trim direction,
and sends signals to the flight data acquisition unit (FDAU). The
other switch connects to ground.
See the flight data recorder system section for more information
　
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