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ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR NEUTRAL SHIFT
27-31-00
Page 54
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The pilots manually control the position of the elevators with
forward and aft movement of the control columns.
The stabilizer mechanically controls the position of the
elevators during stabilizer neutral shift.
The autopilot controls the position of the elevators automatically
when it is engaged.
The digital flight control system (DFCS) automatically controls
the elevators during FCC controlled neutral shift.
Manual Operation - Elevator
The pilots use the control column to operate the elevator for
pitch control. When the control column moves, it moves the
elevator forward quadrant and the elevator control cables. The
control cables move the elevator aft control quadrant. This
provides an input to the elevator input torque tube. Feel force is
provided by the feel and centering unit and dual feel actuator.
The elevator input torque tube moves the elevator PCU input
pogos. The pogos provide inputs to the PCUs. The PCU rod end
is fixed and the housing moves the elevator output torque tube.
The output torque tube moves the elevators through the control
rods.
Autopilot - Elevator
The DFCS uses the autopilot actuators to mechanically give an
input to the elevator input torque tube. The output from the input
torque tube to the elevator PCUs is the same as in the manual
operation.
During autopilot operation, the autopilot actuator input also
backdrives the control columns to the DFCS commanded
position.
See the DFCS section for more information about the autopilot
system. (SECTION 22-11)
Elevator Neutral Shift - Stabilizer Input
When the stabilizer moves, it moves the two elevator neutral
shift rods. The neutral shift rods provide an input to the
elevators through the mach trim actuator, the feel and centering
unit, and the elevator input torque tube to the PCUs. When the
elevator input torque tube moves, it also backdrives the control
cables which move the control columns to their new neutral
position.
During stabilizer electric trim operation, if the pilot gives an
opposite direction to elevator control input, the column cutout
switches make the stabilizer electric trim stop.
ELEVATOR AND TAB CONTROL SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 27-31-00
Page 55
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-017
Elevator Neutral Shift - Flight Control Computer Input
The flight control computers provide an input to the mach trim
actuator when the TE flaps are not up and these conditions
occur:
* The stabilizer trim switches are operated
* TE flap setting changed.
Manual trim, autopilot, speed trim, and control column inputs do
not command the elevators to move by the FCC controlled
neutral shift function.
When the mach trim actuator moves, a mechanical input goes
through the feel and centering unit to the PCUs.
See the elevator neutral shift section for more information about
the FCC controlled neutral shift function. (SECTION 27-31)
Elevator Tab Control
The elevator tab mechanism changes the function of the
elevator tab. When the TE flaps are up, the elevator tab
operates in the balance mode. When the TE flaps are not up, the
elevator tab operates in the anti-balance mode.
See the elevator and tab control system section for more
information on the elevator operation. (SECTION 27-31)
ELEVATOR AND TAB CONTROL SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 27-31-00
Page 56
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-017
ELEVATOR AND TAB CONTROL SYSTEM - FUNCTIONAL DESCRIPTION
ELEVATOR AND TAB CONTROL SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 27-31-00
Page 57
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-017
Purpose
The stall warning system shakes the control column when the
airplane gets close to a stall.
GUN 001-099, 101-113, 115, 201-999
Stall ID increases control column feel forces during a stall.
GUN ALL
Abbreviations and Acronyms
* AC - alternating current
　
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