The spoiler forward quadrant attaches to the quadrant hub with a bearing mount and an override mechanism. The hub attaches to the right shaft assembly with a spline. The spline has a missing tooth to locate the hub on the shaft. The hub has a cam to operate the override mechanism.
The quadrant has an override mechanism to allow override of a jammed quadrant. The override mechanism includes a roller mounted on an arm. A spring pulls on the arm and keeps the roller on the cam.
Location
The spoiler forward quadrant attaches to the lower end of the right shaft assembly. It is between the flight deck floor and the nose gear wheel well. Access to the quadrant is through the MEC, alongside the nose gear wheel well, or through the flight deck floor access panels.
Functional Description
When the pilots move the control wheels, the right shaft assembly turns the spoiler forward quadrant. The quadrant attaches to cables which go to the spoiler control mechanism quadrants in the wing center section.
If there is a jam at the quadrant or of the cables downstream of the quadrant, the pilot can override the jam with a force of 19 lb
(8.6 kg) at the control wheel.
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SPOILER AND SPEEDBRAKE CONTROL -SPOILER FORWARD QUADRANT
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SPOILER AND SPEEDBRAKE CONTROL -SPOILER CONTROL MECHANISM QUADRANTS
Purpose
The spoiler control mechanism quadrants transmit the forward quadrant and cable motion to the spoiler PCU quadrant in each wing.
Physical Description
The three spoiler control mechanism quadrants are part of the spoiler travel mechanism assembly. Each quadrant attaches to the travel mechanism housing with a bearing mount. The housing attaches to the overwing beam structure with two swing links. A bracket beneath the housing supplies a structural reference point.
The central spoiler mechanism quadrant attaches to the cables from the spoiler forward quadrant. The outer two mechanism quadrants are similar, and attach to the cables that go to the spoiler PCU quadrants in each wing. Two control rods link the three quadrants together.
Location
The spoiler control mechanism quadrants are above and slightly forward of the main wheel well at STA 1245, RBL 21. The spoiler travel mechanism assembly attaches to the overwing beams. Since the quadrants are above the slant pressure deck and below the passenger compartment floor, you get access to them through the passenger compartment floor panels.
Functional Description
When the pilots move the control wheels, the right shaft assembly turns the forward spoiler quadrant. The quadrant attaches to cables which go to the center spoiler control mechanism quadrant. When the center quadrant turns, the two outer quadrants move the cables which attach to the spoiler PCU quadrants.
Training Information Point
The center spoiler control mechanism quadrant has a rig pin slot.
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SPOILER AND SPEEDBRAKE CONTROL -SPOILER CONTROL MECHANISM QUADRANTS
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777 AIRCRAFT MAINTENANCE MANUAL
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SPOILER AND SPEEDBRAKE CONTROL -SPEEDBRAKE LEVER AND SPEEDBRAKE LEVER TRANSDUCER
General
Pilots use the speedbrake lever to command the spoilers in speedbrake operation during descent and landing.
The speedbrake components in the control stand are the speedbrake lever, and the speedbrake lever position transducers. See the auto speedbrake control section for more information about the speedbrake components in the control stand (SECTION 27-62).
Physical Description
The speedbrake lever has a DOWN detent, an ARMED position for auto speedbrake control, and an UP position for full spoiler deflection.
The speedbrake lever transducer has four individual RVDTs with a common rotor input. The rotor attaches to the clutch output shaft with a spline. Each RVDT has a separate cable and connector. The ACEs supply 7v ac, 1800 Hz excitation power.
Location
The speedbrake lever is on the captain’s side of the control stand. The speedbrake lever transducers are in an assembly inside the control stand on the captain’s side. Access is through a panel on the left side of the control stand.
Functional Description
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