*
The auto speedbrake thrust reverse switch

*
The auto speedbrake actuator

*
The auto speedbrake relays.

Speedbrake Lever Transducer

The speedbrake lever transducer supplies a signal that the speedbrake lever is in the ARMED position or beyond.
See the spoiler and speedbrake control section for more information about the speedbrake lever transducer (SECTION 27-61).
Auto Speedbrake Thrust Reverse Switch

The auto speedbrake thrust reverse switch supplies an electrical signal to the ACEs when there is movement of one or both thrust reverser levers. The signal goes from the auto speedbrake thrust reverse switch to the AIMS cabinets which transmit it to the ACEs through the flight controls ARINC 629 buses.
Auto Speedbrake Actuator
The auto speedbrake actuator receives electrical power through the auto speedbrake relays. Switches in the auto speedbrake actuator supply the actuator position feedback to the L1 and R ACEs.
Auto Speedbrake Relays
The auto speedbrake relays receive the command signals from the L1 and R ACEs. When both relays are energized, they supply electrical power to extend the auto speedbrake actuator. Extension of the actuator rod causes the speedbrake lever to move from the ARMED position to the UP position.
When both auto speedbrake relays are de-energized, they supply electrical power to retract the auto speedbrake actuator. Retraction of the actuator causes the speedbrake lever to move from the UP position to the DOWN position.

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777 AIRCRAFT MAINTENANCE MANUAL

AUTO SPEEDBRAKE CONTROL -INTERFACES

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AUTO SPEEDBRAKE CONTROL -AUTO SPEEDBRAKE CLUTCH

Purpose

The auto speedbrake clutch transmits the movement of the speedbrake lever or the auto speedbrake actuator to the speedbrake lever transducer. The auto speedbrake clutch prevents movement of the speedbrake lever without an input from the pilot or the auto speedbrake actuator.
The auto speedbrake clutch supplies friction for pilot feel. It also has a detent when the speedbrake lever reaches the ARMED position. The auto speedbrake clutch permits the pilot to move the speedbrake lever and to override the auto speedbrake actuator at anytime.
Physical Description

The auto speedbrake clutch attaches to the left support frame of the control stand. The speedbrake lever control rod attaches to the top lever of the auto speedbrake clutch. The auto speedbrake actuator attaches to the lower aft lever of the auto speedbrake clutch. The output shaft of the auto speedbrake clutch has a spline which connects to the shaft of the speedbrake lever transducer.
The auto speedbrake clutch is an LRU. It is not necessary to adjust the clutch. The clutch weighs about 2 lb (1.8 kg).
Location
The auto speedbrake clutch is on the left side of the control stand in the flight deck. Remove the left panel of the control stand to get access to the auto speedbrake clutch.

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AUTO SPEEDBRAKE CONTROL -AUTO SPEEDBRAKE CLUTCH

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AUTO SPEEDBRAKE CONTROL -AUTO SPEEDBRAKE ACTUATOR

Purpose Functional Description
The auto speedbrake actuator extends and retracts to move the When the actuator gets electrical power, the current direction
speedbrake lever and the speedbrake lever transducer. The causes it to move to the full extended or retracted position.
auto speedbrake clutch transmits the movement from the auto
speedbrake actuator.

Physical Description

The auto speedbrake actuator is a self-contained unit which contains these components:
*
A reversible electric motor

*
A gearbox

*
Limit switches

The limit switches control electrical power to the reversible motor and supply a feedback position signal to the L1 ACE.
The auto speedbrake actuator operates with 28v dc current. It has a stroke of 1.6 inch (40.64 mm).
The auto speedbrake actuator is an LRU. It is not necessary to adjust the actuator. The actuator weighs about 2.8lb (1.3 kg).
Location

The auto speedbrake actuator is on the left side of the control stand in the flight deck. Remove the left panel of the control stand to get access to the auto speedbrake actuator.
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