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_______ SHUTOFF VALVE HANDLES ARE IN THE CLOSED POSITION. IF THE DEFUEL VALVES OR MANUAL SHUTOFF VALVES ARE OPEN, FUEL CAN FLOW FROM THE FUEL-FEED MANIFOLD INTO THE REFUEL/JETTISON MANIFOLD. IF A JETTISON NOZZLE VALVE IS OPEN, FUEL CAN FLOW FROM THE WINGTIPS AT THE JETTISON NOZZLES. A FUEL LEAK CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (3)  Make sure the handles for the manual defuel valves and manual shutoff valves (found at the left and right pressure refuel stations) are in the closed position.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

 S 864-050
 WARNING: MAKE SURE THERE IS NOT PRESSURE IN THE REFUEL/JETTISON
_______ MANIFOLD. IF THERE IS PRESSURE IN THE REFUEL/JETTISON MANIFOLD, A FUEL LEAKAGE CAN OCCUR. FUEL CAN FLOW FROM THE JETTISON NOZZLES WHICH CAN CAUSE A DANGEROUS CONDITION FOR EQUIPMENT AND PERSONS.
 (4)  
Wait a minimum of 1.5 hours after a refuel, defuel or fuel transfer operation to make sure the refuel/jettison manifold is not pressurized.

 S 864-043

 (5)  
If it is necessary to do maintenance before the 1.5 hours time limit, do these steps to remove the pressure from the refuel/jettison manifold.

 WARNING: REFER TO AMM 27-81-00/201 FOR LOCK INSTALLATION PROCEDURE.
_______ FLAPS WILL RETRACT IN 7 SECONDS. INSTALL LOCKS TO PREVENT INJURY FROM INADVERTENT OPERATION OF FLAPS.
 (a)  
Install the locks on all the extended leading edge flaps (AMM 27-81-00/201).

 (b)  
Open the access door, 521CB, to get to the refuel control panel, P42.

 (c)  
Make sure the floodlights come on and there is power.

 (d)  
Make sure the fuel quantity gages show a fuel quantity.

 (e)  
Make sure the No. 2 and No. 3 main tanks are not full (at VTO).

 (f)  
Make sure the OVERFILL red light is not on.

 (g)  
Put the refuel valve switches, MAIN 2 and MAIN 3, to the OPEN position.

 NOTE: This will remove the pressure from the refuel/jettison
____ manifold. The blue indication lights for the refuel valves in the No. 2 and No. 3 main tanks will come on if the refuel/jettison manifold pressure is more than 6 psig and the refuel valve is operational.
 1)  If a blue indication light did not come on, it is possible that the refuel valve did not operate electrically. a) Use the manual method to open the applicable refuel
 valve(s) (AMM 12-11-01/301). b) Wait for 5 minutes. c) Close the refuel valve(s) that were opened manually
 (AMM 12-11-01/301).
 (h)  After the blue indication lights for the refuel valves go off, wait for 5 minutes.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 (i)  Put the refuel valve switches, MAIN 2 and MAIN 3, to the CLOSED position.
 S 014-003
 (6)  
Remove the applicable access door, 556AB or 656AB, from the wingtip dry bay.

 S 034-004

 (7)  
Remove the applicable electrical connector, DV56, from the actuator, V56 (left wing), or the electrical connector, DV49, from the actuator, V49 (right wing).

 S 034-005

 (8)  
Remove the bonding jumper from the actuator.

 S 864-006

 (9)
Make sure the manual override lever is in the CLOSED position.

 S 034-007

 (10)
 Remove the screws and washers (4 locations) that attach the actuator to the valve body.

 S 024-008

 (11)
 Disconnect the actuator shaft from the valve body and remove it from the airplane.

 TASK 28-31-05-404-009
 3.  Fuel Jettison Nozzle Valve Actuator Installation (Fig. 401)________________________________________________
 A. Equipment
 (1)  
Bonding Meter (SWPM 20-20-00) Approved for use in fuel vapor areas

 B.
References
　
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本文鏈接地址：747-400 AMM 飛機(jī)維護(hù)手冊(cè) 燃油 FUEL 4(50)