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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
CHAPTER 27
Flight Controls
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The flight controls keep the airplane at the necessary attitude
during flight. They have movable surfaces on the wing and the
empennage. These are the two types of flight control systems:
* Primary
* Secondary.
Primary Flight Control System
The primary flight control system moves the airplane about
three axes: lateral, longitudinal, and vertical. The primary flight
control system has these components:
* Aileron (2)
* Elevator (2)
* Rudder.
Secondary Flight Controls
The secondary flight controls improve the lift and handling
properties of the airplane. The secondary flight control system
has these components:
* Leading edge devices (12)
* Trailing edge flaps (4)
* Spoilers and speedbrakes (12)
* Horizontal stabilizer.
Abbreviations and Acronyms
* A/P - autopilot
* A/S - airspeed
* C/W - control wheel
* CB - circuit breaker
* cntl - control
* dc - direct current
* FCC - flight control computer
* FLT - flight
* gnd - ground
* LE - leading edge
* MLG - main landing gear
* NLG - nose landing gear
* PCU - power control unit
* psi - pounds per square inch
* RUD - rudder
* S/B - speedbrake
* sec - section
* SOV - shutoff valve
* stab - stabilizer
* STBY - standby
* sw - switch
* sys - system
* TE - trailing edge
* typ - typical
* vlv - valve
* v - volt
* xfer - transfer
FLIGHT CONTROLS - INTRODUCTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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FLIGHT CONTROLS - INTRODUCTION
FLIGHT CONTROLS - INTRODUCTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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FLIGHT CONTROLS - INTRODUCTION
FLIGHT CONTROLS - INTRODUCTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-00-00-001
General
The pilots manually operate the flight controls through cables.
The autopilot automatically operates them.
Aileron
The aileron control wheels move cables that give input to the
aileron feel and centering unit. This controls the aileron PCUs.
The PCUs move the aileron wing cables and the ailerons.
The aileron trim switches give an input to the aileron feel and
centering unit and change the neutral position of the ailerons.
Aileron PCU movement also goes to the spoiler mixer. The
mixer moves the flight spoiler wing cables, which control the
flight spoiler actuators. The actuators move the flight spoilers to
assist the ailerons for roll control.
The autopilot actuators give a mechanical input to the PCUs
through the feel and centering unit. The PCUs move the aileron
wing cables and the ailerons and they give input to the spoiler
mixer.
Elevator
The control columns move cables that give input to the elevator
feel and centering unit. This controls the elevator PCUs. The
PCUs move torque tubes that move the elevators.
The autopilot actuators give a mechanical input to the PCUs
through the feel and centering unit. The PCU moves the
elevators.
Rudder
The rudder pedals move cables that give an input to the rudder
feel and centering unit. This controls the rudder PCUs. The
rudder PCUs move the rudder.
The rudder trim switch gives an input to the rudder feel and
centering unit and change the neutral position of the rudder.
Flaps and Slats
The flap control lever moves the trailing edge flap control valve.
Hydraulic pressure goes through the valve and drives the
hydraulic motor. The hydraulic motor supplies power to the flap
drive system and the flaps move. Follow-up cables give
feedback to the trailing edge flap control valve to stop the
flaps at the commanded position.
The follow-up cables also give an input to the leading edge flaps
control valve. This controls the position of the leading edge
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