(2)
AMM 28-11-02/401, Main Tank Access Door
(3)
AMM 28-26-00/201, Defueling
(4)
AIPC 28-22-12 Fig. 2
B.
Access
(1)
Location Zones 541 Inbd Main Tank (Part), Front Spar to mid Spar, Left 544 Inbd Main Tank (Part), Mid Spar to Rear Spar Left 545 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 641 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 645 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right
(2)
Access Panels
544AB Fuel Tank Access Door
545BB Fuel Tank Access Door
545CB Boost Pump Access Door
545DB Boost Pump Access Door
644AB Fuel Tank Access Door
645BB Fuel Tank Access Door
645CB Boost Pump Access Door
645DB Boost Pump Access Door
C.
Procedure
(1)
Defuel the applicable fuel tank (AMM 28-26-00/201).
S 654-002
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A
747-400
MAINTENANCE MANUAL
S 864-003
WARNING: CAREFULLY DO ALL THE SAFETY PROCEDURES TO DEFUEL AND GO INTO
_______ THE FUEL TANKS. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT OBEY THE SAFETY PROCEDURES.
(2)
Purge and go into the fuel tank (AMM 28-11-00/201).
S 014-019
(3)
Remove the applicable fuel tank access door for access to the removal check valve (AMM 28-11-02/401) and go into the fuel tank.
(a)
For the removal check valve in the No. 1 or No. 4 main tank forward and aft boost pumps, remove the fuel tank access door, 545BB or 645BB.
(b)
For the removal check valve in the No. 2 or No. 3 main tank forward and aft boost pumps, remove the fuel tank access door, 544AB or 644AB.
S 014-004
(4)
Disconnect the coupling (15) at the pump inlet line (6).
(a)
Discard the packing (7).
S 034-005
(5)
Remove the bolts (2), washers (1,14), and the nuts (13) (6 locations) that attach the removal check valve to the outer boost pump housing.
S 024-007
(6)
Remove the removal check valve (8) and packing (12) from the fuel tank.
S 034-008
(7)
Discard the packings (7, 12).
TASK 28-22-18-404-009
3. Removal Check Valve Installation (Fig. 401)
________________________________
A. Consumable Materials
(1)
D00128 Petrolatum - Technical, VV-P-236
B.
References
(1)
AMM 12-11-01/301, Fuel Servicing
(2)
AMM 28-11-00/201, Fuel Tanks
(3)
AMM 28-22-03/401, Main Tank Boost Pump Motor/Impeller Unit
(4)
IPC 28-22-12 Fig. 2
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747-400
MAINTENANCE MANUAL
INBOARD MAIN
OUTBOARD MAIN BOOST PUMPS
BOOST PUMPS
SEE A
SEE A
OUTBOARD MAIN BOOST PUMPS SEE A
INBOARD MAIN BOOST PUMPS
SEE A
15. COUPLING 9. DISCHARGE
CHECK VALVE
7. PACKING 12. PACKING
6. PUMP INLET
LINE 8. REMOVAL
CHECK
VALVE
10. PRESSURE SENSOR LINE
5. WASHER (2 LOCATIONS)
4. BOLT (2 LOCATIONS)
2. BOLT (6 LOCATIONS)
1. WASHER (6 LOCATIONS)
3. SUPPORT BRACKET
14. WASHER 11. HOUSING (6 LOCATIONS)
13. NUT (6 LOCATIONS)
INBOARD AND OUTBOARD MAIN BOOST PUMPS A
NOTE:BOOST PUMP INSTALLED ON THE FRONT SPAR SHOWN; BOOST PUMP INSTALLED IN THE DRY BAY AND REAR SPAR ARE ALMOST THE SAME.
Main Tank Boost Pump Removal Check Valve Installation Figure 401
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