(4)  
This task operates the fuel pumps that are necessary for the fuel jettison system. Make sure the minimum and maximum fuel quantities called out in the prepare for the test procedure are available.

 B.
References

 (1)  
AMM 12-11-01/301, Fuel Servicing

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 28-22-16/401, Fuel System Card File

 (4)  
AMM 31-61-00/501, Integrated Display System (IDS)

 (5)  
AMM 32-09-02/201, Air/Ground Relays

 (6)  
AMM 34-61-02/401, Control display Unit

 (7)  
AMM 45-10-00/501, Central Maintenance Computer (CMC)

 (8)  
AMM 27-81-00/201, Leading Edge Flap System

 (9)  
AMM 28-26-00/201, Defueling

 (10)
 AMM 28-31-01/401, Override/jettison Pump Motor/Impellor Unit

 C.
Access

 (1)  
Location Zones
 115 Area Between Nose Gear Well and Fuselage, Left
 221 Control Cabin, Left
 222 Control Cabin, Right
 521 Leading Edge to Front Spar, Left
 556 Dry Bay, Front Spar to Rear Spar, Left
 656 Dry Bay, Front Spar to Rear Spar, Right

 Access Panels
 521CB Refuel Control Panel Access Door
 556AB Wingtip Dry Bay Access Door
 656AB Wingtip Dry Bay Access Door

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400 MAINTENANCE MANUAL
 D. Preconditions
 S 865-262
 (1)  
These conditions are necessary for this task:

 (a)  
Fuel Jettison System serviceable.

 (b)  
A specific fuel quantity is necessary for this task (AMM 12-11-01/301, AMM 28-26-00/201).

 (c)  
Electrical Power On (AMM 24-22-00/201).

 (d)  
Fuel System Card File serviceable (AMM 28-22-16/401).

 (e)  
Integrated Display System (IDS) serviceable (AMM 31-61-00/501).

 (f)  
Airplane must be in the ground mode (AMM 32-09-02/201).

 (g)  
CDU installed (AMM 34-61-02/401).

 (h)  
Central Maintenance Computer (CMC) serviceable (AMM 45-10-00/501).

 E.
Prepare for the Test

 S 865-077
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-078

 (2)  
Make sure these circuit breakers are closed:

 (a)  
On the main power distribution panel, P6:
 1) 6C17, FUEL JTSN CONT B
 2) 6D17, FUEL JTSN CONT A
 3) 6E17, CTR R & MAIN 2 JTSN VLV
 4) 6F5, FUEL SYS MGMT CARD A
 5) 6F6, FUEL SYS MGMT CH1
 6) 6F7, FUEL SYS MGMT CARD B
 7) 6F8, FUEL SYS MGMT CH2
 8) 6F17, CTR L & MAIN 3 JTSN VLV

 (b)  
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

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747-400 MAINTENANCE MANUAL
 5) 180E2, FUEL OVRD/JTSN PMP CONT CTR L 6) 180E3, FUEL OVRD/JTSN PMP CONT FWD 2&3 7) 180E18, FUEL OVRD/JTSN PMP CONT AFT 2&3 8) 180H17, FUEL SYS EICAS INTFC CONT 9) 180H18, FUEL OVRD/JTSN PMP CONT CTR R
 (c)  
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
 4) 414F17, FUELING VALVE
 5) 414F22, FUELING PWR

 (d)  
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 495-194
　
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