(a)  
MEASUREMENT NUMBER 1;

__________________ Measure the bonding resistance from the exposed threads on the valve unit mounting stud (one location), to the refuel valve control unit (SWPM 20-20-00).
 NOTE: The bonding resistance must not be more than 0.008 ohm.
____
 (b)  MEASUREMENT NUMBER 2;
_____________________ Measure the bonding resistance from the exposed threads on the valve unit mounting stud (one location), to structure (spar) (SWPM 20-20-00).
 NOTE: The bonding resistance must not be more than 0.008 ohm.
____
 S 414-018
 (10) Close the access doors or the panels that are in the open position.
 S 094-019
 WARNING: MAKE SURE YOU OBEY THE INSTRUCTIONS IN AMM 32-00-30/201 WHEN
_______ YOU REMOVE THE LOCKS. IF THE LOCKS ARE NOT CORRECTLY REMOVED, THE FAST MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (11)
 Remove the wing and body gear door locks, if they are installed (AMM 32-00-30/201).

 S 864-020

 (12)
 Remove the DO-NOT-CLOSE tags and close these circuit breakers:

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

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

 (13)
 Make sure the refuel valve operates correctly (AMM 12-11-01/301).

 S 714-021
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-21-02
 ALL  ú ú 04 Page 410 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 MANIFOLD DRAIN VALVE - REMOVAL/INSTALLATION
___________________________________________
 1.  General
_______
 A.  This procedure contains instructions to remove and install the drain valves for the fuel jettison manifold.
 B.  The drain valves are installed in the fuel jettison manifold which is at the inboard end of the inboard main tanks.
 C.  You can get access to the valves through the inboard main tank access doors and the wing rib openings.
 TASK 28-21-03-004-001
 2.  Manifold Drain Valve Removal (Fig. 401)
____________________________
 A.  References
 (1)  
AMM 28-11-00/201, Fuel Tanks

 (2)  
AMM 28-26-00/201, Defueling

 (3)  
AIPC 28-21-03, Fig. 1

 B.  
Access

 (1)  
Location Zones 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right

 (2)  
Access Panels
 544AB Fuel Tank Access Door
 644AB Fuel Tank Access Door

 C.  
Procedure

 S 654-002
 (1)  Defuel the applicable main tank (AMM 28-26-00/201).
 S 864-003
 WARNING: CAREFULLY DO ALL THE SAFETY PROCEDURES TO DEFUEL AND TO GO INTO
_______ THE FUEL TANKS. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT OBEY THE SAFETY PROCEDURES.
 (2)
Purge and prepare to go into the main tank (AMM 28-11-00/201).

 S 864-004

 (3)  
Go into the fuel tank through the fuel tank access opening, 544AB or 644AB (AMM 28-11-00/201).

 (4)  
Remove the lockwire from the drain valve.

 S 034-013
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-21-03
 ALL  ú ú 01 Page 401 ú Jun 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 024-010
 (5)  
Remove the drain valve from the fuel tube.

 S 034-011

 (6)  
Discard the O-ring.

 TASK 28-21-03-404-006
 3.  Manifold Drain Valve Installation (Fig. 401)_________________________________
　
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