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ELEVATOR AND TAB CONTROL SYSTEM - COMPONENT LOCATION
EFFECTIVITY
GUN ALL 27-31-00
Page 15
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-003
THIS PAGE IS INTENTIONALLY LEFT BLANK
ELEVATOR AND TAB CONTROL SYSTEM - COMPONENT LOCATION
27-31-00
Page 16
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
Each pilot uses a control column for pitch control through the
elevator forward control quadrants.
Location
The two control columns are in the flight compartment. The
elevator forward control quadrants are under the flight
compartment.
Physical Description
The control columns extend through the flight compartment
floor and attach to the elevator forward control quadrants. The
balance weights attach on each forward control quadrant. There
is a pitch force transducer in each forward control quadrant.
See the digital flight control system section for more information
on the pitch force transducer. (SECTION 22-11)
The elevator control cables attach at the lower surface of the
quadrants. Each cable attaches to the quadrant. Elevator up
cables (EB) go directly aft. Elevator down cables (EA) go
forward around the turnaround pulley and then go aft.
Functional Description
The control columns move the forward input torque tube. This
moves the elevator forward control quadrants and the cables to
control the elevator position.
The column balance weights balance out the weight of the
upper part of the control column. This prevents elevator input
from the weight of the control column when the pilot does not
make a control input.
When the forward input torque tube moves, it gives a
mechanical input to the column cutout switch modules.
See the horizontal stabilizer trim control section for more
information on the column cutout switch modules.
(SECTION 27-41)
Elevator Breakout Mechanism
The elevator breakout mechanism attaches to the forward input
torque tube. The breakout mechanism separates the left and
right sides of the input torque tube. This allows elevator control
if one column has a jam.
The breakout mechanism is a cam-roller type. The cam
connects to the captain torque tube. The roller connects to an
arm of the first officer torque tube. The two springs hold the
roller at the detent position. The pilot must supply 31 pounds of
additional force to extend the springs during a jam. When 100
pounds is applied, the elevator moves 4 degrees.
ELEVATOR AND TAB CONTROL SYSTEM - CONTROL COLUMN AND ELEVATOR FORWARD CONTROL QUADRANT
EFFECTIVITY
GUN ALL 27-31-00
Page 17
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-004
During normal operation, a control column moves and operates
both torque tubes together. If one column has a jam, the other
column can still move after the pilot overcomes the breakout
force of the two springs.
ELEVATOR AND TAB CONTROL SYSTEM - CONTROL COLUMN AND ELEVATOR FORWARD CONTROL QUADRANT
EFFECTIVITY
GUN ALL 27-31-00
Page 18
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-004
ELEVATOR AND TAB CONTROL SYSTEM - CONTROL COLUMN AND ELEVATOR FORWARD CONTROL QUADRANT
ELEVATOR AND TAB CONTROL SYSTEM - CONTROL COLUMN AND ELEVATOR FORWARD CONTROL QUADRANT
EFFECTIVITY
GUN ALL 27-31-00
Page 19
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-004
Purpose
The elevator cables transmit the pilot force to the elevator
PCUs.
Location
The elevator cables are under the floor. They start at the
elevator forward control quadrants in the forward equipment
compartment and end at the aft control quadrants in the
empennage.
Physical Description
The elevator control cables are in the grooves at the lower
surface of the quadrants. Each cable attaches to the quadrant.
Elevator up cables (EB) go directly aft. Elevator down cables
(EA) go forward around the turnaround pulley and then go aft.
Functional Description
The pilot moves the control columns to control the forward input
torque tube. This moves the elevator forward control quadrants
　
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