S 034-021
(6)
Disconnect the coupling that attaches the discharge line to the discharge tube on the override/jettison pump housing.
(a)
Discard the O-rings (2 locations).
S 034-022
(7) Remove the clamp and the seal from the discharge ring (if they are installed).
NOTE:____Discard the seal and the ring. After a pin is installed in the drain hole, the seal and ring are not necessary.
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747-400
MAINTENANCE MANUAL
S 034-023
(8)
Remove the screws, washers and the nuts (6 locations) that attach the discharge tube to the override/jettison pump housing.
S 034-024
(9)
Remove the discharge tube and the discharge ring.
S 024-025
(10)
Remove the O-rings (2 locations) and the discharge check valve.
S 024-026
(11)
Remove the discharge check valve and O-rings from the fuel tank.
(a)
Discard the O-rings.
TASK 28-31-11-404-038
3. Discharge Check Valve Installation (Fig. 401)
__________________________________
A. Consumable Materials
(1)
B00148 Solvent - Methyl Ethyl Ketone (MEK), TT-M-261
(2)
A00767 - Sealant - BMS 5-45, Type II, class B-1/2 or B-2 for spatula applications
(3)
D00128 Petrolatum - Technical, VV-P-236
B.
Equipment and Materials
(1)
Pin, NAS607-1-4P, 0.50" x 0.062" (nominal)
C.
References
(1)
AMM 07-11-08/201, Cargo and Fuel Loading Support
(2)
AMM 12-11-01/301, Fuel Servicing
(3)
AMM 28-00-00/201, Fuel System
(4)
AMM 28-11-00/201, Fuel Tanks
(5)
AMM 28-31-01/401, Fuel Override/Jettison Motor/Impeller Unit
(6)
AIPC 28-31-07 Fig. 50
D.
Access
(1)
Location Zones 131 Center Section Wing Box, Left 132 Center Section Wing Box, Right 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right
(2)
Access Panels
131AZ Spanwise Beam Access Door
131BZ Spanwise Beam Access Door
131CZ Spanwise Beam Access Door
131DZ Spanwise Beam Access Door
132AZ Spanwise Beam Access Door
132BZ Spanwise Beam Access Door
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747-400 MAINTENANCE MANUAL
DISCHARGE CHECK VALVE FOR THE OVERRIDE/ JETTISON PUMP
FUEL TUBE SEE A
SCREW (6 LOCATIONS)
WASHER (6 LOCATIONS)
DISCHARGE TUBE DISCHARGE RING
SEAL
CLAMP PACKING
1 DRAIN HOLE
SEE BDISCHARGE CHECK VALVE SEAT
PIN DISCHARGE CHECK VALVE ASSEMBLY
TAPER
DRAIN PACKING
HOLE
DISCHARGE CHECK VALVE SEAT
PUMP INLET LINE DRAIN HOLE
B
OVERRIDE/JETTISON PUMP HOUSING
REAR SPAR
(REF)
1 THE SEAL AND THE CLAMP ARE NOT
NECESSARY WHEN THE PIN IS INSTALLED IN THE DRAIN HOLE. DISCHARGE CHECK VALVE FOR
THE OVERRIDE/JETTISON PUMP
A
Override/Jettison Pump Discharge Check Valve
Figure 401
E53362
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E. Prepare the Drain Hole on the Seat for the Discharge Check Valve
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