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AILERON AND FLAPERON CONTROL -GENERAL DESCRIPTION
The PFCs also calculate wheel backdrive commands. The PFCs send these commands to the AFDCs, which calculate control wheel movement commands for the backdrive actuator. The backdrive actuator moves the wheels the same amount as the pilot would move them manually for the same surface movement. The flight crew can override the autopilot through the use of enough force on the wheel to overcome the backdrive actuator.
The AFDCs prevent the aileron trim operation when the autopilot is engaged.
Bank Angle Protection
A bank angle protection (BAP) function in the PFCs supplies protection in both manual and autopilot operation when the bank angle is more than 35 degrees.
The AFDCs prevent the aileron trim operation when the bank angle protection (BAP) is active.
EFFECTIVITY BEJ ALL 27-11-00
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AILERON AND FLAPERON CONTROL -GENERAL DESCRIPTION
EFFECTIVITY BEJ ALL 27-11-00
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AILERON AND FLAPERON CONTROL -COMPONENT LOCATIONS
General
The aileron and flaperon control components are in three areas:
*
The wings
*
The flight deck
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Below the flight deck floor.
See the primary flight controls section for more information about the location of PFCS electronic components (SECTION 27-02).
Wing Components
The aileron and flaperon control surfaces and their PCUs are on the wings. Two PCUs directly connect to each surface. Access to the aileron PCUs is by hinged access panels on the lower wing. Access to the flaperon PCUs is by removable lower skin panels.
Flight Deck Components
The control wheels and aileron trim switches are in the flight deck. The aileron trim switches are on the P8 aft aisle stand panel.
Components Below the Flight Deck
The rest of the forward controls are below the flight deck floor and above the nose gear wheel well. These are the:
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Wheel position transducers
*
Wheel force transducer
*
Wheel cable drums
*
Feel and centering mechanism
*
Wheel jam breakout mechanism
*
Wheel backdrive actuators.
Access to these components is through the main equipment center (MEC), and then forward along the nose gear wheel well.
EFFECTIVITY BEJ ALL 27-11-00
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D633W101-BEJ Sep 05/2002
AILERON AND FLAPERON CONTROL -COMPONENT LOCATIONS
EFFECTIVITY BEJ ALL 27-11-00
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D633W101-BEJ Jan 05/2002
AILERON AND FLAPERON CONTROL -ANALOG AND DISCRETE INTERFACES
General
All of the aileron and flaperon control electrical interfaces within the PFCS go through the ACEs. Each ACE has interfaces with these components:
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Wheel position transducers
*
Wheel force transducer
*
Aileron PCUs
*
Flaperon PCUs.
The aileron trim switches and trim actuator have mechanical interfaces with the aileron and flaperon control system.
Aileron Trim Switches and Trim Actuator
Two trim switches supply power to the trim actuator. The trim actuator moves the control wheels and the wheel position transducers by rotation of the feel and centering mechanism.
Wheel Position Transducers
There are six position transducers, three for each control wheel. Each transducer is a linear variable differential transformer (LVDT) that sends analog signals to the ACEs. These analog signals represent the control wheel position and its movement.
Wheel Force Transducer
There is one force transducer, with two LVDTs, that sends analog signals to the ACEs. These signals show the amount of force the pilots apply to the control wheels.
Aileron PCUs
Each of the four aileron PCUs receives analog and discrete electrical signals from the ACEs. The discrete signals are for the bypass and blocking solenoids. The analog signal is for the electrohydraulic servo valve (EHSV).
Each of the four aileron PCUs sends analog feedback signals to the ACEs. These signals are from the EHSV position LVDT, the actuator position LVDT and the null LVDT.
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