SPOILER AND SPEEDBRAKE CONTROL -WING CENTER SECTION AND WING COMPONENT LOCATIONS
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SPOILER AND SPEEDBRAKE CONTROL -ELECTRICAL INTERFACES
General
All of the roll and speedbrake control electrical interfaces with the PFCS go through the ACEs. The ACEs have interfaces with these components:
*
Wheel position transducers
*
Speedbrake lever transducer
*
Inboard spoiler PCUs
*
Outboard spoiler PCUs
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.
See the aileron and flaperon control section for more information about the wheel position transducers (SECTION 27-11).
Speedbrake Lever Transducers
The speedbrake lever transducer contains four rotary variable differential transformers (RVDTs). These RVDTs send analog signals of the speedbrake lever position to the ACEs.
Inboard Spoiler PCUs
Each of the four inboard spoiler PCUs receives analog electrical signals from the ACEs. The analog signal goes to the electrohydraulic servo valve (EHSV).
Each of these PCUs sends an analog feedback signal to the ACEs from the actuator position LVDT.
Outboard Spoiler PCUs
Each outboard spoiler PCU receives analog electrical signals from the ACEs. For the outboard spoiler PCUs other than 4 and 11, the electrical signal is for the EHSV. For the spoiler 4 and 11 PCUs, the signal goes to the speedbrake solenoid valve.
All ten of the outboard spoiler PCUs send analog feedback signals to the ACEs. These signals are from the actuator position LVDTs.
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SPOILER AND SPEEDBRAKE CONTROL -ELECTRICAL INTERFACES
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SPOILER AND SPEEDBRAKE CONTROL -MECHANICAL INTERFACES
General
The roll control mechanical interface for spoilers 4 and 11 is a cable system. The cable goes from the control wheels to the spoiler PCUs through these components:
*
Forward spoiler quadrant
*
Spoiler control mechanism quadrants
*
Spoiler PCU quadrant.
Forward Spoiler Quadrant
The forward spoiler quadrant connects to the lower end of the right control wheel shaft assembly. Cables connect the forward quadrant to the spoiler control mechanism quadrants through a series of idler pulleys and turnbuckles.
Spoiler Control Mechanism Quadrants
The three spoiler control mechanism quadrants link together to form a travel mechanism assembly. The central mechanism quadrant connects to the cables from the forward spoiler quadrant. The left and right mechanism quadrants connect to the central quadrant with two control rods. Cables go from the left and right quadrants out to the spoiler PCU quadrant on each wing. Pulleys and idler pulleys supply protection to the cables from wing bending. Insulators supply protection from lightning strikes.
Spoiler PCU Quadrants
The spoiler PCU quadrants connect to the PCUs with a mechanical input rod. The rod controls the position of the PCU main control valve.
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SPOILER AND SPEEDBRAKE CONTROL -MECHANICAL INTERFACES
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SPOILER AND SPEEDBRAKE CONTROL -INSULATORS
Purpose
The insulators help protect the airplane from electrical current caused by lightning strikes. The insulators stop the movement of electrical current through the mechanical spoiler control cables.
Physical Description
The insulator is made of an electrically insulated material. The mechanical spoiler control cables attach at both ends of the insulator.
Location
Two insulators are in the left wheel well and two are in the right wheel well. They are near the ceiling and near the outboard side of the forward bulkhead.
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SPOILER AND SPEEDBRAKE CONTROL -INSULATORS
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SPOILER AND SPEEDBRAKE CONTROL -SPOILER FORWARD QUADRANT
Purpose
The spoiler forward quadrant transmits the control wheel and shaft assembly motion to the mechanical spoiler cable system.
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