S 862-436
(11)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
On the DC power distribution panel, P180:
1) 180E2, FUEL OVRD/JTSN PMP CONT CTR L
2) 180E3, FUEL OVRD/JTSN PMP CONT FWD 2&3
3) 180E4, PUMP CONT BST 1 AFT 4 FWD
4) 180E18, FUEL OVRD/JTSN PMP CONT AFT 2&3
5) 180E19, PUMP CONT BST 1 FWD 4 AFT
6) 180H4, PUMP CONT BST 2 AFT 3 FWD
7) 180H18, FUEL OVRD/JTSN PMP CONT CTR R
8) 180H19, PUMP CONT BST 2 FWD 3 AFT
(b)
On the left power distribution center panel, P414:
1) 414A8, MAIN FWD BST PUMP 4
2) 414B5, MAIN AFT BST PUMP 1
3) 414C5, FUEL OVRD/JTSN PUMP FWD 3
4) 414C2, FUEL OVRD/JTSN PUMP FWD 2
5) 414D2, OVRD/JTSN PUMP CTR-L
6) 414E24, MN-AFT PUMP CONT BOOST 2
7) 414J5, MAIN FWD BST PUMP 3
8) 414R18, MAIN AFT BST PMP 2
(c)
On the right power distribution center panel, P415:
1) 415A35, MAIN AFT BOOST PUMP 4
2) 415A38, FUEL OVRD/JTSN PUMP AFT 2
3) 415B35, MAIN FWD BOOST PUMP 1
4) 415B38, FUEL OVRD/JTSN PUMP AFT 3
5) 415G29, MAIN FWD BOOST PUMP 2
6) 415M29, MAIN AFT BOOST PUMP 3
7) 415M32, OVRD/JTSN PUMP CTR-R
S 862-518
(12)
Look at the maintenance history of the airplane.
(a)
Open the applicable circuit breakers for any system(s) that show a problem with wiring or electrical faults.
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(13) Remove the electrical power from the airplane before you remove the fuel tank access doors (AMM 24-22-00/201).
S 942-441
WARNING: DO NOT USE AIRPLANE ELECTRICAL POWER WHEN FUEL TANK ACCESS
_______ DOORS ARE OPEN. A FIRE OR EXPLOSION CAN OCCUR IF FUEL VAPOR IS IGNITED BY SPARK(S) FROM ELECTRICAL EQUIPMENT. A FIRE OR EXPLOSION CAN CAUSE SERIOUS INJURY OR DEATH TO PERSONS AND CAN CAUSE DAMAGE TO EQUIPMENT.
(14)
Do not supply electrical power again until you have completed this procedure: Go Out of and Close the Fuel Tank.
S 862-442
(15)
Disconnect these airplane batteries:
(a)
main (AMM 24-31-01/401)
(b)
APU (AMM 24-31-06/401).
S 942-443
(16)
Attach this sign to each of the battery locations:
(a)
OPEN FUEL TANKS - DO NOT CONNECT
S 942-444
(17)
Attach this sign to the external power receptacle:
(a)
OPEN FUEL TANKS - DO NOT PUT POWER ON
F.
Prepare the Equipment for Fuel Tank Purging
S 912-445
WARNING:_______OBEY THE PURGING AND FUEL TANK ENTRY PRECAUTIONS. FAILURE TO OBEY THE PURGING AND FUEL TANK ENTRY PRECAUTIONS CAN CAUSE SERIOUS INJURY OR DEATH TO PERSONS AND CAN CAUSE DAMAGE TO EQUIPMENT.
(1) Read and obey the precautions in this task: Purging and Fuel Tank Entry Precautions.
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(2)
Make sure one of these portable fire extinguishers is available:
(a)
One - 150 pound dry chemical wheeled extinguisher
(b)
One - 150 pound CO2 wheeled extinguisher
(c)
One - 150 pound Halon wheeled extinguisher
S 942-447
(3)
Make sure the electrical equipment is approved and is appropriate for the hazardous location as shown in Figure 201.
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