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W6 HARNESS  BOLT  BOLT 
W6 HARNESS 
SUPPORT TUBE 
H  NUT  SUPPORT TUBE  I  NUT  WASHERS ALUMEL  NUTS ALUMEL 
EEC THERMOCOUPLE (TT3) PROBE  WASHERS CHROMEL  CHROMEL NUTS 
LEAD GROUND  BOLT 
FWD  BOLT  NUT  TUBE SUPPORT  W6 HARNESS 
BRACKET NUT  W6 HARNESS 
J Figure 405 (Sheet 4) EEC Wiring Harness W6 Installation 

E44649
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
NUT
SUPPORT
TUBE
FWD
W6 
HARNESS  BOLT 
BOLT  K  BRACKET 
W6 
HARNESS 
BOLT 

SUPPORT TUBE
W6 HARNESS BRACKET
NUT
L
NUT
M
EEC Wiring Harness W6 Installation Figure 405 (Sheet 5)
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5) 6G17 SCU ALT PWR ENG 3
 6) 6G25 ENG SCU 3
 7) 6G18 SCU ALT PWR ENG 4
 8) 6G26 ENG SCU 4

 S 014-177-N00
 (2)  Open the right fan cowl panel (AMM 71-11-04/201).
 S 044-178-N00
 WARNING: DO THE THRUST REVERSER DEACTIVATION PROCEDURE TO PREVENT THE
_______ OPERATION OF THE THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  
Do this procedure: Thrust Deactivation for Ground Maintenance (AMM 78-31-00/201).

 S 014-179-N00

 (4)  
Open the right core cowl panel (AMM 71-11-06/201).

 S 014-180-N00
 WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00/201 WHEN YOU OPEN THE
_______ THRUST REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (5)  
Open the right thrust reverser (AMM 78-31-00/201).

 S 024-194-N00

 (6)  
Do these steps to remove the W6 harness from the engine:

 (a)  
Remove the screws which attach the cover and ground lead to the EGT (TT4.95) thermocouple terminal box (View C). 1) Before you disconnect the cable leads, put a tag on each

 lead and terminal stud to help you during the installation.
 CAUTION: DO NOT TWIST OR BEND THE WIRE HARNESS MORE THAN NECESSARY
_______
 DURING THE REMOVAL OF THE WIRE HARNESS. IF THE WIRE
 HARNESS IS TWISTED OR BENT, YOU CAN CAUSE DAMAGE TO THE
 WIRE HARNESS.

 (b)  Remove the nuts and washers which attach the W6 harness leads to the TT4.95 terminal studs (View C). 1) Remove the W6 harness leads from the studs. 2) Install the nuts and washers on the studs.
 NOTE: The diameters of the chromel nut, washer, and
____ terminal stud are smaller than the diameter of the alumel nuts, washers, and terminal studs.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(c)  Remove the nuts and washers which attach the W6 harness leads to the TT3 probe (View J). 1) Remove the W6 harness leads from the TT3 probe. 2) Install the nuts and washers on the studs of the TT3 probe.
 NOTE: The diameters of the chromel nut, washer, and
____ terminal stud are smaller than the diameters of the alumel nuts, washers, and terminal studs.
　
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