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when there is no input.
Location
The elevator feel and centering unit attaches to structure on the
empennage.
Physical Description
The elevator feel and centering unit has these components:
* Housing
* Centering spring (2)
* Centering cam
* Roller
* Centering linkage
* Dual feel actuator.
The mach trim actuator attaches on the top of the housing.
The horizontal stabilizer connects with the housing through the
neutral shift rods and the mach trim actuator.
Functional Description
The centering springs hold the roller in the center of the cam.
When the control column moves, the cam turns with the shaft
and moves the roller up on the cam. This extends the springs
and supplies a feel force to the pilot.
When the pilot releases the control column, the spring force
causes the roller to move to the cam detent. The system moves
to the neutral position.
Functional Description - Dual Feel Actuator
At high airspeeds, the elevator feel computer increases the
metered pressure to the dual feel actuator. The system A and
system B metered pressures are not equal. This moves the
housing of the dual feel actuator to the end of travel.
When the centering cam rotates, the centering linkage pulls
against the highest of the two computed pressures. This adds
an adjustable extra feel force to the feel and centering spring.
This changes the feel force to the pilot.
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR FEEL AND CENTERING UNIT
EFFECTIVITY
GUN ALL 27-31-00
Page 41
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-012
GUN 001-099, 101-113, 115, 201-999
During a stall, the EFSM operates and provides 850 psi system
A pressure to the A side of the dual feel actuator. This increases
the feel force to the pilot. See the stall warning system section
for more information about the elevator feel shift module
operation. (SECTION 27-32)
GUN ALL
Digital Flight Control System Operation - Mach Trim
At high air speeds, the flight control computers (FCCs) send
inputs to the mach trim actuator. The actuator retracts and turns
the elevator feel and centering unit housing and centering cam.
This gives a mechanical input to move the elevators through the
input torque tube.
At low air speeds, the FCCs send inputs to the mach trim
actuator to change the amount of elevator movement through
the neutral shift operation. The neutral shift sensor sends
signals to both FCCs for the relative position between the
stabilizer and the elevator.
See the elevator tab control system - elevator neutral shift
section for more information about the mach trim and neutral
shift operation. (SECTION 27-31)
See the digital flight control system section for more information
about the FCCs and the mach trim actuator operation.
(SECTION 22-11)
Stabilizer Trim
During stabilizer trim movement, the neutral shift rods move
and give mechanical input to the elevator feel and centering unit
housing through the mach trim actuator. This moves the
elevators to a new neutral position.
The stabilizer position sensors A and B send signals to the
FCCs for the new neutral position. Sensor A also sends signals
to the flight data acquisition unit.
See the horizontal stabilizer trim control system section for
more information on the stabilizer operation. (SECTION 27-41)
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR FEEL AND CENTERING UNIT
EFFECTIVITY
GUN ALL 27-31-00
Page 42
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-012
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR FEEL AND CENTERING UNIT
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR FEEL AND CENTERING UNIT
EFFECTIVITY
GUN 114 27-31-00
Page 43
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-012
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR FEEL AND CENTERING UNIT
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR FEEL AND CENTERING UNIT
EFFECTIVITY
GUN 001-099, 101-113, 115, 201-999 27-31-00
Page 44
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-012
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ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR FEEL AND CENTERING UNIT
　
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