TRAS -FLIGHT DECK COMPONENTS
General
These are the thrust reverser actuation system (TRAS) components in the P10 control stand:
*
Sync lock (SL) switch
*
Reverse thrust lever interlock actuator.
*
Directional control valve switches in the thrust lever micro switch pack.
EFFECTIVITY BEJ ALL 78-34-00
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777 AIRCRAFT MAINTENANCE MANUAL
TRAS -FLIGHT DECK COMPONENTS
EFFECTIVITY BEJ ALL 78-34-00
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TRAS -COMPONENTS
General
These are the thrust reverser actuation system (TRAS) components on the strut:
*
Sync lock valve (SLV)
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Sync lock solenoid valve
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Isolation valve (IV)
*
Isolation solenoid valve
*
Directional control solenoid valve
*
Directional control valve (DCV)
*
Flow control tees.
These are the TRAS components on the thrust reverser (T/R):
*
Hydraulic actuator (non-locking)
*
Hydraulic actuator (locking)
*
Sync lock/manual drive unit
*
Sync shafts and tubing.
The thrust reverser test enable switch is on the inlet cowl aft bulkhead, right side.
EFFECTIVITY BEJ ALL 78-34-00
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D633W101-BEJ May 05/2003
PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
TRAS -COMPONENTS
EFFECTIVITY BEJ ALL 78-34-00
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D633W101-BEJ May 05/2003
TRAS -SYNC LOCK SWITCH
Purpose
The sync lock switch closes the circuit that causes the sync lock (SL) solenoid valve to energize.
Location
The sync lock switches are in the thrust levers. There are two sync lock switches; one in the left thrust lever and one in the right thrust lever. You remove the cover on the side of the thrust lever to get access to the switch. The switch installation in the thrust levers are on the inboard side of each lever.
Functional Description
When you move the reverse thrust lever up and aft, a thrust lever cam turns. The cam moves a lever and support shaft mechanism to move a leaf spring to operate the sync lock switch. A cam detent tells you when the reverse thrust lever is at reverse idle.
You use a protractor on the reverse thrust lever to adjust the sync lock switch. The sync lock switch is set at a specified reverse thrust lever angle. You turn the adjusting nut to make the leaf spring touch the sync lock switch at the specified angle.
The sync lock switch will close the circuit to open the sync lock valve between 9.5 and 12.5 degrees of reverse thrust lever travel (nominal 11 degrees).
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