NOTE: You can discard the packing.
____
S 034-010
(9)
Remove the mounting screws and the washers (2 locations) that attach the valve housing to the valve body.
S 024-011
(10)
Remove the housing, the spring, and the secondary poppet from the tank as a full unit.
S 034-012
(11)
Remove the spring and the secondary poppet from the housing.
NOTE: Discard the packing, if it is installed.
____
TASK 28-11-07-404-013
3. Fuel Sump Drain Valve Secondary Poppet Installation (Fig. 401)___________________________________________________
A. References
(1)
AMM 12-11-01/301, Fuel Servicing
(2)
AMM 28-11-00/201, Fuel Tanks
(3)
AMM 28-11-04/401, Fuel Sump Drain Valve Primary Poppet
(4)
AMM 28-11-09/401, Spanwise Beam Access Door
(5)
AIPC 28-11-15 Fig. 2
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
NO. 3 RESERVE
TANK SUMP DRAIN
SEE B
NO. 3 MAIN TANK SUMP DRAIN
SEE A
CENTER WING TANK SUMP DRAIN
SEE A
MOUNTING SCREW (2 LOCATIONS)
A
SURGE TANK SUMP DRAIN SEE A
NO. 4 MAIN TANK SUMP DRAIN
SEE B
NO. 2 MAIN TANK
SUMP DRAIN
SEE A NO. 1 MAIN TANK
SUMP DRAIN
SEE B
WASHER (2 LOCATIONS)
HOUSING
SPRING
SECONDARY POPPET
VALVE BASE
LOWER WING OR STABILIZER SKIN SURGE TANK SUMP DRAIN
SEE A
NO. 2 RESERVE TANK SUMP DRAIN
SEE B
DRAIN LINE
FITTING
O-RING
HOUSING
LOWER WING OR BODY SKIN
MOUNTING SCREW
(2 LOCATIONS) WASHER (2 LOCATIONS)
PACKING SPRING SECONDARY POPPET VALVE BASE
B
Fuel Sump Drain Valve Secondary Poppet Installation
Figure 401
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
B. Access
(1)
Location Zone 131 Center Section Wing Box, Left 132 Center Section Wing Box, Right 541 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 545 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 552 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 555 Surge Tank, Front Spar to Rear Spar, Left 641 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 645 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 652 Outbd Main Tank (Part), Mid Spar to Rear Spar, Right 655 Surge Tank, Front Spar to Rear Spar, Right
(2)
Access Panel
131AZ Spanwise Beam Access Door
544AB Fuel Tank Access Door
545BB Fuel Tank Access Door
552DB Fuel Tank Access Door
644AB Fuel Tank Access Door
645BB Fuel Tank Access Door
652DB Fuel Tank Access Door
C.
Procedure
S 164-014
(1)
Clean the surface on the bottom of the valve.
S 434-015
(2)
Install the secondary poppet in the bottom of the valve.
S 434-016
(3)
Put the spring on top of the secondary poppet.
S 434-017
(4)
If the housing has a drain line port, install the new packing in the housing.
(5)
Carefully put the housing on the spring and the poppet.
(6)
Install the mounting screws and the washers (2 locations).
S 424-018
S 434-019
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