(5)
AMM 28-11-02/401, Reserve and Main Tank Access Door.
(6)
AMM 28-22-03/401, Main Fuel Tank Boost Pump Motor/Impeller Unit
(7)
AIPC 28-22-54 Fig. 1
C.
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
545CD 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
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28-22-19
ALL ú ú 01 Page 403 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
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
16.
BOLT
SEE A 17. WASHER
18. NUT
19.
COUPLING (4 LOCATIONS)
1. DISCHARGE
12. EJECTOR PUMP CHECK VALVE PRESSURE LINE 2. PACKING
13. PACKING
9.
BOLT
10.
WASHER
3. PUMP DISCHARGE LINE
11.
NUT
(4 LOCATIONS)
20. COUPLING
5. PACKING 15. PACKING 4. PRESSURE SENSOR LINE
6. PUMP COOLANT AND CHECK
14. REMOVAL
VAPOR DISCHARGE PORT VALVE
7. PRESSURE SWITCH
8. HOUSING
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 Discharge Check Valve Installation Figure 401
H46254
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28-22-19
ALL ú ú 01 Page 404 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
D. Procedure
S 434-016
(1)
Install a new packing (15) lubricated with petrolatum, on the discharge check valve (1) that attach to the discharge check valve to the pump housing (8).
S 424-035
(2)
Install the bolts (9), washers (10), and nuts (11) (4 locations) to attach the discharge check valve (1) to the housing (8).
S 434-017
(3)
Put a new packing (2) lubricated with petrolatum, in the groove on the outlet port of the discharge check valve (1).
(a)
Slightly stretch the packing (2) before you put it in the groove.
S 424-018
(4)
Install the bolts (16), washers (17), and nuts (18) (4 locations) to attach the discharge check valve to the discharge tube (3).
S 424-019
(5)
Put a new packing (13) in the coupling (19), lubricated with petrolatum, on the ejector pump pressure line (12).
S 424-036
(6)
Connect the ejector pump pressure line coupling (19) to the
discharge check valve (1)
S 434-022
(7)
Install a new packing (5), lubricated with petrolatum, on the coupling (20) that attaches the discharge pressure sensor line (4) to the discharge check valve (1).
(8)
Install the coupling (20) (AMM 28-00-00/201).
S 434-023
NOTE: If the bonding jumpers on the line were disconnected or
____ removed, make sure that the bonding surfaces on the lines are clean and install the bonding jumpers.
S 864-024
(9) Go out of and close the fuel tank (AMM 28-11-00/201).
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