D.
Operational Test of the Fuel Jettison Nozzle Valve

 S 864-018
 (1)  
Supply electrical power, if it is not available (AMM 24-22-00/201).

 S 864-029

 (2)  
Make sure these circuit breakers are closed:

 (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) 414F17, FUELING VALVE

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-31-03
 ALL  ú ú 06 Page 407 ú Jun 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 2) 414F22, FUELING PWR
 S 864-030
 (3)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
On the main power distribution panel, P6:
 1) 6C18, JTSN NOZZLE VLV CONT R
 2) 6D18, JTSN NOZZLE VLV CONT L

 S 864-031
 WARNING: MAKE SURE THESE CIRCUIT BREAKERS ARE OPEN AND DO-NOT-CLOSE TAGS
_______ ARE ATTACHED. FAILURE TO OPEN THESE CIRCUIT BREAKERS CAN CAUSE A FUEL LEAK. FUEL CAN FLOW FROM THE JETTISON NOZZLE WHICH CAN CAUSE A DANGEROUS CONDITION FOR EQUIPMENT AND PERSONS.
 (4)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
On the left power distribution center, P414:
 1) 414C5, FUEL OVRD/JTSN PUMP FWD 3
 2) 414C2, FUEL OVRD/JTSN PUMP FWD 2
 3) 414D2, OVRD/JTSN PUMP CTR L

 (b)  
On the right power distribution center, P415:
 1) 415A38, FUEL OVRD/JTSN PUMP AFT 2
 2) 415B38, FUEL OVRD/JTSN PUMP AFT 3
 3) 415M32, OVRD/JTSN PUMP CTR R

 S 864-032
 WARNING: MAKE SURE THE FUEL JETTISON CONTROL SELECTOR SWITCH IS IN THE
_______ OFF POSITION. FUEL CAN FLOW FROM THE JETTISON NOZZLE WHICH CAN CAUSE A DANGEROUS CONDITION FOR EQUIPMENT AND PERSONS.
 (5)  Make sure the FUEL JETTISON control selector switch, found on the P5 pilots' overhead panel, is in the OFF position.
 S 864-043
 WARNING: MAKE SURE THE TWO DEFUEL VALVE HANDLES AND THE TWO MANUAL
_______ 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.
 (6)  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

 28-31-03
 ALL  ú ú 03 Page 408 ú Jun 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-045
 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.
 (7)  
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 864-047

 (8)  
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.

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

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

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

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

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

 (f)  
Put the refuel valve switches, MAIN 2 and MAIN 3, to the OPEN position.
　
中國航空網(wǎng) 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 4(43)