*
Flaps at landing position
*
Either thrust lever is more than 5 degrees above the idle stop.
The EICAS memo message SPEEDBRAKE ARMED indicates that the speedbrakes are armed.
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SPOILER AND SPEEDBRAKE CONTROL -SPEEDBRAKE LEVER AND SPEEDBRAKE LEVER TRANSDUCER
On the MFD status display, the message SPEEDBRAKE LEVER XDCR shows when one of the four speedbrake lever transducers has failed.
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SPOILER AND SPEEDBRAKE CONTROL -SPEEDBRAKE LEVER AND SPEEDBRAKE LEVER TRANSDUCER
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SPOILER AND SPEEDBRAKE CONTROL -SPOILER PCU QUADRANT
Purpose
The spoiler PCU quadrants supply mechanical input for roll control to the spoiler 4 and 11 PCUs. The quadrants receive this input from the cable system.
Physical Description
The spoiler PCU quadrants attach to the wing rear spar structure with a bracket. The quadrants attach to the PCU mechanical input shafts with a rod and crank assembly. Cables connect the quadrants to the travel mechanism assembly.
Location
The spoiler PCU quadrants are on the forward, left side of the spoiler 4 and 11 PCUs. Access to the quadrants is through hinged panels on the lower wing.
Functional Description
When the pilot moves the control wheel, the cable system moves the spoiler PCU quadrants. The quadrant movement pushes the input rod forward or aft. The input rod turns the PCU input crank, which attaches to the end of the PCU input shaft with a spline. Rotation of this shaft supplies the mechanical input to the PCU.
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SPOILER AND SPEEDBRAKE CONTROL -SPOILER PCU QUADRANT
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SPOILER AND SPEEDBRAKE CONTROL -CABLE-CONTROLLED SPOILER PCU -PHYSICAL DESCRIPTION
General
The cable-controlled PCUs move the outboard spoilers 4 and 11 in roll and speedbrake control. Mechanical command signals from the control wheels, and electrical command signals from the speedbrake lever control the PCUs. Each spoiler has one PCU.
Location
The cable-controlled PCUs are on the rear spar of the inboard wing. Access to the PCUs is through two hinged panels on the lower wing.
Trunnion pillow blocks connect the PCUs to the rear spar structural fitting. Each PCU actuator rod connects to its spoiler actuator fitting.
An electrical connector is near the cap end of the PCU. Hydraulic tubing connect to two ports next to the electrical connector.
Physical Description
The two cable-controlled spoiler PCUs are identical. Each weighs approximately 20 lb (9 kg).
The PCUs contain an unbalanced hydraulic actuator with a control module. The control module contains:
*
A main control valve
*
A speedbrake solenoid valve
*
A speedbrake mode valve
*
An extension check and relief valve with manual bypass
*
An inlet filter.
The actuator piston has an LVDT that sends position feedback signals to the ACE.
Training Information Point
Use the manual bypass to extend the PCU for maintenance.
Install a spoiler PCU lock when the panel is in the up position.
Use the spoiler PCU rod end adjustment to rig the PCU.
The rod end of the actuator has a grease fitting.
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SPOILER AND SPEEDBRAKE CONTROL -CABLE-CONTROLLED SPOILER PCU -PHYSICAL DESCRIPTION
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