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A
747-400 MAINTENANCE MANUAL
 D. Procedure
 S 864-002
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Main Power Distribution Panel 1) 6C5 ALTN PWR LOOP A APU FIRE/BLD DUC OVHT 2) 6H14 APU FIRE/BLD DUCT OVHT LOOP A 3) 6H15 APU FIRE/BLD DUCT OVHT LOOP B
 S 014-034
 WARNING: MAKE SURE PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
 (2)  Extend the wing leading edge flap for access to the thermal switches (AMM 27-81-00/201).
 S 494-004
 WARNING: REFER TO AMM 27-81-00/201 FOR LOCK INSTALLATION PROCEDURE.
_______ FLAPS WILL RETRACT IN 7 SECONDS. INSTALL LOCKS TO PREVENT INJURY FROM ACCIDENTAL OPERATION OF FLAPS.
 (3)  
Install safety locks on all extended leading edge flaps when persons work in the area of the leading edge.

 S 014-005

 (4)  
Remove the wing access panel if it is necessary. Refer to (AMM 06-09-08/201 and Fig. 401 for access door identification.

 S 014-006

 (5)  
Remove the applicable strut access door. Refer to AMM 06-09-09/201 and Fig. 401 for access door identification.

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 26-18-02
 ALL  ú ú 04 Page 407 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 014-032
 (6)  
For center duct thermal switches, remove applicable access door. Refer to Fig. 401 for access door identification.

 S 034-007

 (7)  
Disconnect the electrical connection or splice of the switch where applicable.

 S 164-008

 (8)  
Remove the sealant around the switch on the top, the bottom of the midspar, and around the electrical connection where applicable.

 S 164-035

 (9)  
Remove the terminal lugs when applicable.

 S 034-009

 (10)
 Remove the nut and the washers.

 S 024-010

 (11)
 Remove the switch.

 TASK 26-18-02-404-011
 3.  Installation of the Thermal Switch (Fig. 401)__________________________________
 A. Special Tools and Equipment
 (1)  
17MIT65B04017 - Lock - Drive Unit, Leading Edge Flap

 B.
Consumable Materials

 (1)  
A00280 Sealant - RTV 3145 or equiv

 (2)  
A00247 Sealant - BMS 5-95

 (3)  
B00184 Solvent - BMS 11-7

 (4)  
G00507 Cloth - Lint Free

 C.
References

 (1)  
AMM 06-09-09/201, Nacelle and Engine-to-Wing Fairing Access Doors and Panels

 (2)  
AMM 06-09-08/201, Wing Access Doors and Panels

 (3)  
AMM 24-22-00/201, Manual Control

 (4)  
AMM 26-18-00/501, Wing Leading Edge Overheat Detection System

 (5)  
AMM 27-81-00/201, Leading Edge Flap System

 (6)  
AMM 31-61-00/201, Integrated Display System

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 26-18-02
 ALL  ú ú 05 Page 408 ú Feb 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (7)
AIPC 26-18-01, Fig. 2

 (8)
WDM 26-18-15, WDM 26-18-16, WDM 26-16-17, WDM 26-18-18

 (9)
WDM 20-30-12

 D. Access
 (1)  
Location Zone
 133 Air Conditioning Equipment Bay, Left
 134 Air Conditioning Equipment Bay, Right
 137 Body Landing Gear Well, L.H.
 138 Body Landing Gear Well, R.H.
 452 Nacelle Strut 1 - Torque Box
 462 Nacelle Strut 2 - Torque Box
 472 Nacelle Strut 3 - Torque Box
 482 Nacelle Strut 4 - Torque Box

 511 Leading Edge to Front Spar, Left 521 Leading Edge to Front Spar, Left 531 Leading Edge to Front Spar, Left 611 Leading Edge to Front Spar, Right 621 Leading Edge to Front Spar, Right 631 Leading Edge to Front Spar, Right
　
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