(a)  
Keep the bonding jumper (11) and attached bonding clip for the installation.

 S 034-012
 (16)
 Remove the housing (12) and for No. 1 and 4 main tank boost pumps, the gasket seal (8) from the fuel tank.

 S 034-013

 (17)
 Remove the bolts (21), washers (22), and nuts (23) (four locations) that attach the discharge check valve (1) to the housing (12).

 S 034-014

 (18)
 Remove the removal check valve (18).

 (a)  
Discard the packing.

 TASK 28-22-12-404-016
 3. Main Tank Boost Pump Housing Installation (Fig. 401)
_________________________________________
 A. Parts
 ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 9 |Bolt | 28-22-12 | 02 | 20,25 | | | 10 |Washer | | | 30 | | | 12 |Housing | | | 10 | | | 24 |Screw | | | 15 | | | 25 |Washer | | | 30 | 2......…........…...................................…..........….....….........1
 B. Consumable Materials
 (1)  
D00128 Petrolatum - Technical, VV-P-206

 (2)  
A00745 Sealant - Corrosion Protection, BMS5-142

 (3)  
A00247 Sealant - Corrosion Protection, BMS5-95 Type 1 (Alternate cap sealant for BMS5-142)

 (4)  
C00064 Coating - Alodine 600 Chemical conversion coating for aluminum or aluminum alloys, (MIL-C-5541).

 (5)  
C00307 Corrosion Resistant Finish - BMS 10-20 Type II

 C.
References

 (1)  
AIPC 28-22-12, Fig. 1

 (2)  
AMM 20-11-14/701, Metal Surfaces

 (3)  
AMM 51-21-04/701, Alodine Coating

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747-400
MAINTENANCE MANUAL

 (4)  
AMM 28-00-00/201, Fuel

 (5)  
AMM 28-11-00/201, Fuel Tanks

 (6)  
AMM 28-11-00/801, Fuel Tanks

 (7)  
AMM 28-11-02/401, Reserve and Main Tank Access Door

 (8)  
AMM 28-22-03/401, Main Tank Boost Pump Motor/Impeller Unit

 (9)  
SWPM 20-20-00, Electrical Bond and Ground

 D.
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

 E.
Procedure

 S 434-041
 (1)  
On the outside of the tank, do these steps:

 (a)  
Clean the mating surface of the spar where the bolts go through the structure (AMM 20-11-14/701).

 (b)  
Prepare the faying surfaces of these components for an electrical surface bond (SWPM 20-20-00) (View A-A): 1) Structure where the bonding jumper attaches 2) Bonding jumper faying surface 3) For the No. 1 and 4 main tank boost pumps, faying surfaces

 of the ring (28).
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MAINTENANCE MANUAL

 S 434-042
 (2)  On the inside of the tank, clean the mating surfaces of the spar and the housing flange (AMM 20-11-14/701).
 S 434-017
　
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