28-31-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(b) Push the LSK that is adjacent to START TEST>.
NOTE: IN PROGRESS shows during the test.
____
(c) When IN PROGRESS goes out of view, look for PASS or FAIL> adjacent to the <JETT TRANSFER VLV.
NOTE: If a PASS indication shows, no failure occured
____
during the test.
S 745-183
(9)
If FAIL> shows:
(a)
Push the LSK that is adjacent to FAIL> to see the GROUND TEST MSG page for the failure.
(b)
Push the NEXT PAGE key until you find the GROUND TEST MSG pages.
(c)
Make a list of all CMCS messages, CMCS message numbers that show on the GROUND TEST MSG pages.
(d)
Go the the CMCS Message Index of the Fault Isolation Manual to find the corrective action for each CMCS message.
S 865-203
(10)
Set the CMCS test switch to the NORM position.
S 865-185
(11)
Put the FUEL JETTISON selector switch to the OFF position.
E.
Put the Airplane Back to the Usual Condition.
S 865-204
(1)
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
(b)
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
(c)
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 865-188
(2) Remove electrical power from the airplane, if it is not necessary (AMM 24-22-00/201).
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28-31-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
FUEL OVERRIDE/JETTISON PUMP MOTOR/IMPELLER UNIT - REMOVAL/INSTALLATION
______________________________________________________________________
1. General_______
A. This procedure contains these tasks:
(1)
Fuel Override/Jettison Pump Motor/Impeller Unit Removal
(2)
Fuel Override/Jettison Pump Motor/Impeller Unit Installation
(3)
Override/Jettison Pump - Insulation Resistance Check
(4)
Fuel Jettison/Override Motor/Impeller Unit Operational Test
B.
Pump Interchangeability Notes:
(1)
Reference Drawing 344U0052 for pump interchangeable part requirements.
(2)
The airplane wiring will accommodate both pump connector configurations (bracket mounted and face mounted). The pumps are fully interchangeable. Adjust the wire bundle slack and drip loop per the requirements of SWPM 20-10-11.
C.
Access to the Pumps
(1)
Two override/jettison pumps are found in each inboard main tank, installed on the rear spar near the inboard end of the tank. Two override/jettison pumps are found in the center wing tank, installed on the rear spar at the two ends of the tank.
(2)
You can get access to the override/jettison pumps from the wheel well for the wing landing gear. It is not necessary to remove access door or panels.
(3)
The door locks for the wing and body gear must be installed when you do maintenance in the wheel well area.
TASK 28-31-01-004-001
2. Fuel Override/Jettison Pump Motor/Impeller Unit Removal (Fig. 401)_______________________________________________________
A. Reference
(1)
AIPC 28-31-01 Fig. 2
(2)
AIPC 28-31-01 Fig. 5
(3)
AMM 32-00-30/201, Landing Gear Door Locks
(4)
SSM 28-31-02, 28-31-04
(5)
SWPM 20-10-11, Installation of Electrical Wires and Harnesses
(6)
WDM 28-31-21, WDM 28-31-22, WDM 28-31-23, WDM 28-31-24
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