(c)
On the left power distribution center panel, P414:
1) 414A8, MAIN FWD BST PUMP 4
2) 414B5, MAIN AFT BST PUMP 1
3) 414E24, MN-AFT PUMP CONT BOOST 2
4) 414J5, MAIN FWD BST PUMP 3
5) 414R18, MAIN AFT BST PMP 2
(d)
On the right power distribution center panel, P415:
1) 415A35, MAIN AFT BOOST PUMP 4
2) 415B35, MAIN FWD BOOST PUMP 1
3) 415G29, MAIN FWD BOOST PUMP 2
4) 415M29, MAIN AFT BOOST PUMP 3
S 015-318
(8)
Do these steps at the applicable engine where the maintenance is to be done.
(a)
Remove the electrical power (AMM 24-11-00/201).
(b)
Open the fan cowl panels (AMM 71-11-04/201).
WARNING: DO THE THRUST REVERSER DEACTIVATION PROCEDURE TO PREVENT
_______ THE OPERATION OF THE THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
(c) Do this procedure: Thrust Reverser Deactivation for Ground Maintenance (AMM 78-31-00/201).
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747-400 MAINTENANCE MANUAL
(d) Open the core cowl panels (AMM 71-11-06/201).
WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00/201 WHEN YOU OPEN
_______ THE THRUST REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(e) Open the thrust reversers (AMM 78-31-00/201).
S 655-292
(9)
Do these steps to drain the fuel from the applicable fuel line and engine fuel pump.
(a)
Put the fuel resistant container (5 gallon), below the applicable engine fuel pump.
(b)
Remove the drain plug from the fuel pump.
(c)
Drain the fuel into the container.
(d)
Remove and discard the O-ring from the drain plug.
H.
Test the Spar Valve for the No. 1 Engine
NOTE: This test makes sure that the spar valve is in the correct
____
closed position.
S 865-361
(1)
Make sure the FUEL CONTROL switches are in the CUTOFF position.
(2)
Supply the electric power (AMM 24-22-00/201).
S 715-293
(3)
Monitor the fuel leakage from the No. 1 engine fuel pump where you removed the drain plug.
S 865-321
NOTE: Allow the fuel leakage rate to stabilize.
____
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747-400 MAINTENANCE MANUAL
S 715-500
(4)
Make sure the fuel leakage rate is not more than 5 cubic centimeters
(cc)
in 10 minutes.
S 715-362
(5)
Put these fuel pump control switches on the fuel management control module, M154, (pilots' overhead panel, P5) to the ON position:
(a)
MAIN 1 FWD
(b)
MAIN 1 AFT
S 715-363
(6)
Make sure the fuel leakage rate is not more than 5 cc in 10 minutes.
S 715-364
(7)
Put these switches on the fuel manangement control module, M154, to the off position:
(a)
MAIN 1 FWD
(b)
MAIN 1 AFT
S 715-365
(8)
Continue this test (if necessary) for the other spar valves, or do this procedure: Put the Airplane Back to the Usual Condition.
I.
Test the Spar Valve for the No. 2 Engine
NOTE: This test makes sure that the spar valve is in the correct
____
closed position.
S 865-328
(1)
Make sure the FUEL CONTROL switches are in the CUTOFF position.
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