(2)
Access Panel 415 and 416 Thrust Reverser Halves - Engine 1 425 and 426 Thrust Reverser Halves - Engine 2 435 and 436 Thrust Reverser Halves - Engine 3 445 and 446 Thrust Reverser Halves - Engine 4
E.
Prepare to Remove the Fuel Bypass Valve
(1)
Supply the electrical power (AMM 24-22-00/201).
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
PUMP FUEL SEE B UNIT METERING FUEL
SEE A (REF) MAIN GEARBOX A FWD
2. FUEL TUBE COOLER INLET FOR OIL 3. BOLT (3 LOCATIONS)
TEE FOR FUEL
SUPPLY MANIFOLD
17. TUBE
NUT
FUEL FUEL PUMP
METERING
UNIT, M3108 4. PACKING
16. PACKING 5. PLUG
15. PACKING 6. PACKING
14. WASHER
(4 LOCATIONS)
FWD
7. FUEL BYPASS
13. BOLT VALVE
(4 LOCATIONS) 8. PACKING
9. ADAPTER
12. TUBE NUT
10. TUBE NUT
11. FUEL SUPPLY
TUBE
B
Fuel Bypass Valve Installation
Figure 401
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(2) Make sure the applicable FUEL CONTROL switch is in the CUTOFF position. (a) Install the DO-NOT-OPERATE tag.
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(3) Push the STAT button on the select panel for the EICAS display.
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(4) Make sure the status page shows on the auxiliary EICAS.
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(5) Make sure the applicable status message of the FUEL SPAR VLV 1, 2, 3, or 4 does not show.___
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(6) For the applicable engine, open this circuit breaker and install the DO-NOT-CLOSE tag: (a) P6 Main Power Distribution Panel 1) 6G01 FUEL SHUTOFF VALVE ENG 1 2) 6G02 FUEL SHUTOFF VALVE ENG 2 3) 6G03 FUEL SHUTOFF VALVE ENG 3 4) 6G04 FUEL SHUTOFF VALVE ENG 4
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(7)
Remove the electrical power if it is not necessary (AMM 24-22-00/201).
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(8)
Open the fan cowl panels (AMM 71-11-04/201).
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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.
(9) Do this procedure: Thrust Reverser Deactivation for Ground Maintenance (AMM 78-31-00/201).
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(10) Open the core cowl panels (AMM 71-11-06/201).
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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.
(11)
Open the thrust reversers (AMM 78-31-00/201).
F.
Procedure
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(1)
Remove the fuel bypass valve:
(a)
Put the container below the fuel pump.
(b)
Drain the fuel from the fuel pump:
1) Remove the drain plug (5) from the FP3 port and let the fuel drain from the fuel pump. a) Discard the packing (4).
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