78-34-13
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
THRUST REVERSER SYNC LOCK - INSPECTION/CHECK
____________________________________________
 1.  General
_______
 A.  This task examines the condition of the sync lock gasket for each thrust reverser sync lock. There are two thrust reverser sync locks on each engine. The sync locks are installed on the lower non-locking hydraulic actuator of each thrust reverser sleeve.
 B.  The sync lock gasket, bracket, and band clamp do not let the thrust reverser sync lock turn on the end of the lower non-locking hydraulic actuator. If the sync lock gasket is not serviceable, the thrust reverser sync lock can turn in the band clamp, which can let the thrust reverser extend accidentally.
 C.  It is necessary to remove the band clamp and loosen the sync lock bracket to examine the sync lock gasket for deterioration.
 D.  The thrust reverser sync lock will be referred to as the sync lock in this procedure.
 E.  The lower non-locking hydraulic actuator for the thrust reverser will be referred to as the lower actuator in this procedure.
 TASK 78-34-13-206-001-N00
 2.  Thrust Reverser Sync Lock Inspection
____________________________________
 A.  References
 (1)
AMM 78-31-00/201, Thrust Reverser System

 (2)
AMM 78-31-00/501, Thrust Reverser System

 B.  
Access

 (1)  
Location Zones
 211 Flight Compartment
 212 Flight Compartment
 410 No. 1 Power Plant
 420 No. 2 Power Plant
 430 No. 3 Power Plant
 440 No. 4 Power Plant

 (2)  
Access Panels
 413 and 414 Fan Cowl Panels - Engine 1
 423 and 424 Fan Cowl Panels - Engine 2
 433 and 434 Fan Cowl Panels - Engine 3
 443 and 444 Fan Cowl Panels - Engine 4

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
C. Prepare to Do the Sync Lock Gasket Inspection.
 S 846-002-N00
 (1)  For the applicable engine, open these circuit breakers and install the DO-NOT-CLOSE tags:
 (a)  On the Main Power Distribution Panel, P6:
 1) 6F13 ENG 1 T/R CONT
 2) 6E13 ENG 2 T/R CONT
 3) 6D13 ENG 3 T/R CONT
 4) 6C13 ENG 4 T/R CONT
 5) 6F11 ENG 1 T/R LOCK CONT
 6) 6E11 ENG 2 T/R LOCK CONT
 7) 6D11 ENG 3 T/R LOCK CONT
 8) 6C11 ENG 4 T/R LOCK CONT

 S 046-017-N00
 WARNING: DO THE DEACTIVATION PROCEDURE PREVENT THE OPERATION OF THE
_______ THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  
Do the deactivation procedure for the thrust reverser for ground maintenance (AMM 78-31-00/201).

 S 016-004-N00

 (3)  
Open the applicable fan cowl panels (AMM 71-11-04/201).

 D.
Do the Sync Lock Gasket Inspection.

 S 026-005-N00
 (1)  Do these steps to remove the sync lock gasket from the lower actuator.
 (a)  
Disconnect the L(R) electrical connector, DV170(DV171), from the L(R) sync lock, V170(V171).

 (b)  
Loosen the two bolts that attach the sync lock bracket to the sync lock.

 (c)  
Remove the band clamp that attaches the sync lock bracket to the lower actuator.

 (d)  
Remove the sync lock gasket from the lower actuator.

 S 216-006-N00
 (2)  Examine the sync lock gasket for these conditions:
 (a)  
Look for cracks, tears, or other damage in the sync lock gasket.

 (b)  
Make sure the sync lock gasket is soft and has no brittle areas or deterioration.

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 78-34-13
 ALL  ú ú N02 Page 602 ú Jun 18/99
　
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