C.  
Procedure

 S 864-002
 (1)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
On the DC power distribution panel, P180: 1) 180M8, FUELING VALVE 2 2) 180M9, FUELING PWR - HOT BAT 3) 180C25, FUELING LTS PANEL 4) 180C26, FUELING LTS RECP

 (b)  
On the left power distribution center, P414: 1) 414F22, FUELING PWR 2) 414F17, FUELNG VALVE

 (2)  
Open the right door of the P180 panel.

 (3)  
Loosen the screws (3 locations) that attach the relay to the socket.

 S 014-003
 S 024-004
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-21-05
 ALL  ú ú 05 Page 401 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 014-010
 (4)  Remove the relay.
 TASK 28-21-05-404-005
 3.  Fueling Power Transfer Relay Installation_________________________________________
 A. References
 (1)  
AIPC 28-21-51 Fig. 2

 (2)  
SSM 28-21-01

 B.
Access

 (1)  
Location Zone 118 Electrical & Electronics Compartment, Right

 C.
Procedure

 S 424-006
 (1)  Put the relay into the socket.
 NOTE: The relay pins must engage the socket contacts a minimum of
____
 0.10 inch before you tighten the screws.
 S 424-009
 (2)  
Tighten the screws (3 locations).

 S 414-007

 (3)  
Close the P180 panel door.

 S 864-008

 (4)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
On the DC power distribution panel, P180: 1) 180M8, FUELING VALVE 2) 180M9, FUELING PWR - HOT BAT 3) 180C25, FUELING LTS PANEL 4) 180C26, FUELING LTS RECP

 (b)  
On the left power distribution center, P414: 1) 414F17, FUELNG VALVE

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-21-05
 ALL  ú ú 07 Page 402 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 2) 414F22, FUELING PWR
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-21-05
 ALL  ú ú 20 Page 403 ú Jun 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 WING SURGE TANK FLOAT SWITCH - REMOVAL/INSTALLATION
___________________________________________________
 1.  General_______
 A.  This procedure contains instructions to remove and install the float switch from the wing surge tank.
 B.  A float switch is found in each wing surge tank, installed on the front spar.
 (1)  
To remove the float switch it is necessary to extend the leading edge flaps to get to the float switch flange on the forward side of the front spar.

 C.  
When persons do maintenance in the area of the wing leading edge, install the safety locks on all of the extended leading edge flaps.

 TASK 28-21-12-004-001
 2.  Surge Tank Float Switch Removal (Fig. 401)_______________________________
 A.  Equipment
 (1)  
Sealant Removal Tools (optional):

 (a)  
ST980A, Sealant Removal Tools

 (b)  
ST982, Sealant Removal Tools

 (c)  
ST1066, Sealant Removal Tools

 B.  
Consumable Materials

 (1)  
B00148 Solvent - Methyl Ethyl Ketone (MEK), TT-M-261

 (2)  
G00507 Cloth - Clean, lint-free

 C.  
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 27-81-00/201, Leading Edge Flap System

 (3)  
　
中國航空網 m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 燃油 FUEL 2(42)