(a)  
P6 Main Power Distribution Panel
 1) 6F1 IGN 1 ENG 1
 2) 6F2 IGN 1 ENG 2
 3) 6F3 IGN 1 ENG 3
 4) 6F4 IGN 1 ENG 4
 5) 6K19 IGN 2 ENG 1
 6) 6K20 IGN 2 ENG 2
 7) 6K21 IGN 2 ENG 3
 8) 6K22 IGN 2 ENG 4
 9) 6G19 STBY IGN ENG 1
 10) 6G20 STBY IGN ENG 2
 11) 6G21 STBY IGN ENG 3
 12) 6G22 STBY IGN ENG 4
 13) 6G1 FUEL SHUTOFF VALVE ENG 1
 14) 6G2 FUEL SHUTOFF VALVE ENG 2
 15) 6G3 FUEL SHUTOFF VALVE ENG 3
 16) 6G4 FUEL SHUTOFF VALVE ENG 4

 S 865-006-N00
 (5)  
Put the FUEL CONTROL switch to RUN.

 (6)  
Open the right fan cowl panel (AMM 71-11-04/201).

 S 015-022-N00
 S 045-028-N00
 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.
 (7)  
Do this procedure: Thrust Reverser Deactivation for Ground Maintenance (AMM 78-31-00/201).

 (8)  
Open the right core cowl panel (AMM 71-11-06/201).

 S 015-023-N00
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S 415-029-N00
 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.
 (9)  
Open the right thrust reverser (AMM 78-31-00/201).

 S 685-008-N00

 (10)
 Drain the fuel filter housing.

 (a)  
Put the container below the drain plug for the fuel filter.

 (b)  
Remove the drain plug to let the fuel drain in the container. 1) Discard the packing on the drain plug.

 (c)  
Lubricate the new packing for the drain plug with the
 petrolatum.

 (d)  
Install the new packing on the drain plug.

 (e)  
Lubricate the threads of the drain plug with engine oil.

 (f)  
Install the drain plug in the cover of the fuel filter housing.

 1)  Tighten the drain plug to 45-55 pound-inches (5.1-6.2 newton-meters).
 S 485-009-N00
 (11)
 Install the pressure adapter.

 (a)  
Remove the bolts and washers which attach the differential pressure switch for the fuel filter to the fuel pump.

 (b)  
Remove and hold the differential pressure switch from the fuel pump. 1) Discard the packings.

 (c)  
Lubricate the new packings with the petrolatum.

 (d)  
Install the new packings in the recesses of the adapter pressure ports.

 (e)  
Put the adapter on the differential pressure switch with the dowel pin in the hole and bolt holes aligned.

 (f)  
Attach the adapter to the differential pressure switch with the mounting bolts and washers. 1) Tighten the bolts.

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 485-010-N00
 (12)
 Connect the compressed air source, pressure gauge, vent valve, and shutoff valve as shown in Fig. 502.

 H.
Do the System Test for the Bypass Warning System

 S 865-011-N00
 (1)  Make sure you stop for a minimum of five minutes from time the FUEL CONTROL switch was set to RUN.
FUEL FILTER
PRESSURE
DIFFERENTIAL
ADAPTER

Fuel Filter Bypass Warning System Test Schematic
Figure 502

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