(e)  
If the indications are not in the limits, you must do these steps: 1) Make a careful visual inspection of all the electrical

 wires and connectors between the sync lock and its power circuit breaker (WDM 78-34-11, WDM 78-34-21, WDM 78-34-31, or WDM 78-34-41).
 2)  Repair all the unserviceable electrical wire and connectors that you find.
 3)  Use the multi-meter again to make sure there are no "hot" short circuits in the electrical system which can accidentally supply power to the sync locks.
 F.  Do the Mechanical Integrity Test for the Sync Locks.
 S 865-006-N00
 (1)  Supply hydraulic power (AMM 29-11-00/201).
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 78-34-13
 ALL  ú ú N02 Page 503 ú Feb 18/02
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 985-022-N00
 WARNING: MAKE SURE ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE AREA
_______ BEHIND EACH THRUST REVERSER. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR IF THE SYNC LOCKS DO NOT OPERATE CORRECTLY AND THE THRUST REVERSER EXTENDS.
 (2)  Move the applicable reverse thrust lever aft to try to extend the thrust reverser with hydraulic power (AMM 78-31-00/201).
 NOTE: If the thrust reverser sleeves do not extend, the sync locks
____ are serviceable. If the thrust reverser sleeve extends, the applicable sync lock did not operate correctly.
 S 905-008-N00
 (3)  
If the thrust reverser sleeve(s) extended, replace the sync lock(s) (AMM 78-34-13/401).

 S 775-026-N00

 (4)  
If any sync lock(s) were replaced, do the Mechanical Integrity Test for the Sync Locks (AMM 78-34-13/501).

 S 985-009-N00

 (5)  
Move the applicable reverse thrust lever forward to the stow position.

 S 415-010-N00

 (6)  
Install the electrical connector, DV170, on the sync lock, V170, on the left sleeve of the thrust reverser.

 S 415-011-N00

 (7)  
Install the electrical connector, DV171, on the sync lock, V171, on the right sleeve of the thrust reverser.

 S 985-021-N00
 WARNING: MAKE SURE ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE AREA
_______ BEHIND THE THRUST REVERSERS. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR WHEN THE THRUST REVERSERS ARE EXTENDED.
 (8)  Move the applicable reverse thrust lever aft to try to extend the thrust reverser with hydraulic power (AMM 78-31-00/201).
 NOTE: If the thrust reverser sleeves extend, the sync locks are
____ serviceable. If the thrust reverser sleeve does not extend, the applicable sync lock did not operate correctly.
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 78-34-13
 ALL  ú ú N02 Page 504 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 905-013-N00
 (9)  
If the thrust reverser sleeve(s) did not extend when you moved the reverse thrust levers, replace the sync lock(s) (AMM 78-34-13/401).

 G.
Put the Airplane Back to Its Usual Condition.

 S 845-014-N00
 (1)  
Move the reverse thrust levers forward to fully retract the thrust reversers on the applicable engine (AMM 78-31-00/201).

 S 845-015-N00

 (2)  
Remove the hydraulic power if it is not necessary
 (AMM 29-11-00/201).

 S 845-016-N00

 (3)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 S 845-017-N00

 (4)  
Close the fan cowl panels (AMM 71-11-04/201).

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