(10)
Install the fitting on the valve housing.
S 434-049
(11)
Tighten the fitting.
S 434-021
(12)
On the drain valve with a possible drain line, connect the drain line coupling to the fitting on the valve housing.
S 434-053
(13)
Tighten the coupling.
S 714-022
(14)
Do a check for the secondary poppet from the outer side of the tank.
(a)
Push up the secondary poppet with the end of a pencil or an equivalent.
NOTE: After the poppet releases, make sure the poppet is flat
____ against the housing.
S 414-023
(15)
If you replace the poppet in the valve from the center wing tank, install the 131AZ access door in the No. 3 spanwise beam (AMM 28-11-09/401).
S 414-024
(16)
Get out of the fuel tank and close the tank (AMM 28-11-00/201).
S 414-025
(17)
Install the primary poppet into the drain valve (AMM 28-11-04/401).
S 654-026
(18)
If you replaced the secondary poppet in the fuel tank, fill the applicable fuel tank with some fuel (AMM 12-11-01/301).
(19)
Make sure the fuel drain valve does not have a leak.
S 794-027
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-11-07
ALL ú ú 02 Page 406 ú Jun 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
SPANWISE BEAM ACCESS DOOR - REMOVAL/INSTALLATION
________________________________________________
1. General_______
A. This procedure contains instructions to remove and install a spanwise beam access door in the center wing tank.
B. There are six access doors installed in the center wing tank. The spanwise beam No. 1 and the midspar contain two doors. The spanwise beam No. 2 and the spanwise beam No. 3 contain one door.
C. The access to the spanwise beam access doors is through the access door for the center wing tank.
TASK 28-11-09-004-001
2. Spanwise Beam Access Door Removal (Fig._________________________________401)
A. References
(1)
28-11-00/201, Fuel Tanks
(2)
28-26-00/201, Defueling
B.
Access
(1)
Location Zones
131 Center Section Wing Box, Left
132 Center Section Wing Box, Right
(2)
Access Panel
131EZ Center Wing Tank Access Door
C.
Procedure
S 654-002
(1) Defuel the center wing tank (Ref 28-26-00/201).
S 864-003
WARNING: OBEY ALL OF THE FUEL TANK PURGING AND ENTRY PRECAUTIONS.
_______ FAILURE TO OBEY ALL OF THE FUEL TANK PURGING AND ENTRY PRECAUTIONS CAN CAUSE INJURY TO A PERSON AND IT COULD CAUSE DAMAGE TO THE AIRPLANE.
(2)
Remove the fuel and prepare the center wing tank for an entrance (Ref 28-11-00/201).
(3)
Go into the center wing tank (Ref 28-11-00/201).
S 034-005
(4)
Remove the bolts and washers found in the spanwise beam access door (12 locations, spanwise beam No. 1; 20 locations, midspar and spanwise beams No. 2 and No. 3).
S 864-004
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-11-09
ALL ú ú 01 Page 401 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 024-006
(5) Remove the access door.
TASK 28-11-09-404-007
3. Spanwise Beam Access Door Installation (Fig. 401)______________________________________
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