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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-036
DFCS - PITCH CWS FORCE TRANSDUCER - LOCATIONS
DFCS - PITCH CWS FORCE TRANSDUCER - LOCATIONS
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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DFCS - PITCH CWS FORCE TRANSDUCER - LOCATIONS
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D633A101-SHZ1 Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The purpose of the autopilot actuator is to change electrical
commands from the FCC into a hydraulically controlled
mechanical output. The outputs of the actuators become
inputs to the aileron and the elevator power control units
(PCU). The PCUs move the control surfaces.
Operation
There are four autopilot actuators on the airplane. They operate
independently. Two actuators control the ailerons and two
actuators control the elevators. One aileron and one elevator
actuator receive electrical signals from the FCC A. These
actuators get hydraulic pressure from hydraulic system A. The
other aileron and elevator actuator receives electrical signals
from the FCC B. These actuators get hydraulic pressure from
hydraulic system B.
You can control the ailerons with only aileron actuator A or
aileron actuator B. In the dual mode, you use the two aileron
actuators A and B together. This is also the way the elevator
actuators operate.
Shear rivets on the actuator output cranks protect against jams
inside the actuator. The pilot can override any jam with the
application of approximately 100 pounds at the controls. This
will break the shear rivets.
Physical Description
The actuator is approximately 17.5 inches long, 7.5 inches wide
and about 6.0 inches high. The actuator weighs approximately
15.5 pounds with no hydraulic fluid in it.
These are the line replaceable units (LRU) on the actuator:
* Actuator solenoid valve
* Detent solenoid valve
* Transfer valve
* Hydraulic pressure switch.
The linear variable differential transformer (LVDT) measures
the position of the actuator main piston. It is not an LRU.
Training Information Point
Before you remove an autopilot actuator, obey this warning.
WARNING: ISOLATE OR TAG THE AILERON, ELEVATOR,
RUDDER, SPOILER AND SPEED BRAKE
CONTROL SYSTEMS. THESE SYSTEMS MAY
MOVE SUDDENLY WHEN YOU REMOVE THE
HYDRAULIC POWER. THIS CAN CAUSE INJURY
TO PERSONS OR DAMAGE TO EQUIPMENT.
If you work on an aileron actuator, obey this warning.
DFCS - AUTOPILOT ACTUATOR - INTRODUCTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-037
WARNING: YOU MUST CAREFULLY INSTALL THE GROUND
LOCKS IN ALL LANDING GEAR. AN ACCIDENTAL
RETRACTION OF THE LANDING GEAR CAN
CAUSE INJURY TO PERSONS AND DAMAGE TO
EQUIPMENT.
DFCS - AUTOPILOT ACTUATOR - INTRODUCTION
EFFECTIVITY
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Page 98.6
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-037
DFCS - AUTOPILOT ACTUATOR - INTRODUCTION
DFCS - AUTOPILOT ACTUATOR - INTRODUCTION
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-037
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DFCS - AUTOPILOT ACTUATOR - INTRODUCTION
22-11-00
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D633A101-SHZ1 Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The autopilot actuator changes an electrical signal from the
FCC to a hydraulic pressure. This moves the main piston and
the output crank. The actuator position sensor supplies a signal
to the FCC.
Before Autopilot Engagement
The actuator solenoid is not energized before engagement of
the autopilot. This prevents hydraulic pressure in the autopilot
actuator. Without hydraulic pressure, the detent piston springs
move the detent pistons away from the internal output crank.
This lets the output crank move freely as the control surfaces
　
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