A sync lock/manual drive unit is installed to the lower hydraulic actuator on each thrust reverser half. Open the fan cowl panels to get access to the sync lock/manual drive units.
Physical Description
These are the parts on the sync lock/manual drive unit:
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Lock pin

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Lock release lever and target

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Hydraulic control port

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Manual drive unit

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Proximity sensor

The sync lock manual drive unit is a manual drive and lock mechanism with a lockout piston. The sync lock manual drive unit weighs approximately 7.5 pounds (3.4 kilograms). A union fitting and packing are installed in the control pressure port.
The manual drive and lock mechanism are in a sealed housing that is installed on the lower hydraulic actuator. The sync lock/ manual drive unit in operation is filled with hydraulic fluid. When the sync lock/manual drive unit is replaced on the hydraulic actuator, the packing between the backup rings must be replaced.
The sync lock/manual drive unit is installed on the lower hydraulic actuator with five bolts and filler washers. The bolts are lockwired.
The manual drive is a right-angle drive with a spring loaded pinion gear which engages the bevel gear on the rotating jaw. A clutch is splined on the pinion gear. The lock mechanism is a rotating jaw and a sliding jaw; both have two locking teeth. The sliding jaw is spring loaded to engage with the rotating jaw for locking, and is moved hydraulically to disengage for unlock. When unlock hydraulic pressure is applied to the differential area of a lockout piston that is perpendicular to the sliding jaw. This piston is normally disengaged by a spring, but when hydraulic pressure is applied, the piston is forced to engage a groove in the unlocked sliding jaw and keeps the jaw in the unlocked position.

EFFECTIVITY BEJ ALL  78-34-00 
Page 16 
D633W101-BEJ  May 05/2003 

TRAS -SYNC LOCK/MANUAL DRIVE UNIT

The output shaft on the rotating jaw in the sync lock manual drive unit has a square cross-section drive that fits into the hydraulic actuator worm gear that also connects the square drive of the sync shaft.
The sync lock/manual drive unit is the same identical unit on the left and right thrust reverser half. When the sync lock/manual drive unit is installed on the left thrust reverser half, the unlock lever, proximity sensor and the hydraulic and electrical connections are between the unit and the forward torque box. When the unit is installed on the right thrust reverser half, the unlock lever, proximity sensor and the hydraulic and electrical connections are away from the forward torque box.
Lock Release Lever and Lock Pin

You use the lock release lever to manually release the sync lock. The lock pin holds the lever in the not locked position. The lever is spring loaded to return to the locked position.
The target for the sync lock proximity sensor is mounted on the lever.
　
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