28-11-05
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757 MAINTENANCE MANUAL
TASK 28-11-05-404-003
3. Install the Sump Drain Valve and Flapper Assembly (Fig. 401)
_________________________________________________
A. Equipment
(1)
Adapter, Sump Drain Valve R/I - B28001-1
Adapter, Main and Surge Tanks - B28001-2
Adapter, Center Tank - B28001-5
B.
References
(1)
AMM 06-41-00/201, Fuselage Access Doors and Panels
(2)
AMM 12-11-01/301, Pressure Fueling
(3)
AMM 12-11-03/301, Fuel Tank Sump Draining
(4)
AMM 28-11-00/201, Fuel Tanks (Purging and Entry)
(5)
AMM 28-11-01/401, Main Tank Access Door
(6)
AMM 28-11-03/401, Surge Tank Access Door
C.
Access
(1)
Location Zones 194 Wing to Body - Forward Lower Half (Right) 541 Main Tank - Rib No. 5 to No. 17 (Left) 543 Surge Tank - Rib No. 21 to No. 23 (Left) 641 Main Tank - Rib No. 5 to No. 17 (Right) 643 Surge Tank - Rib No. 21 to No. 23 (Right)
(2)
Access Panels
194CL ECS Equipment Bay Access Door (Left)
194CR ECS Equipment Bay Access Door (Right)
541AB Main Tank Access Door (Left)
543AB Surge Tank Access Door (Left)
641AB Main Tank Access Door (Right)
643AB Surge Tank Access Door (Right)
D.
Procedure
S 914-033
WARNING: OBEY THE FUEL TANK ENTRY PRECAUTIONS (AMM 28-11-00/201).
_______ FAILURE TO OBEY THE FUEL TANK ENTRY PRECAUTIONS CAN CAUSE INJURY OR DAMAGE.
(1)
Obey the fuel tank entry precautions (AMM 28-11-00/201).
S 214-016
(2)
Make sure the areas of the drain valve and the lower surface of the fuel tank that touch are clean and not damaged.
S 424-028
(3)
Put the flange of the drain valve in the groove of the lower surface of the fuel tank.
(4)
Install the screw to close the flange on the drain valve.
S 434-027
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28-11-05
ALL ú ú 01 Page 404 ú May 28/99
A
757 MAINTENANCE MANUAL
S 424-026
(5)
Install a new O-ring on the drain valve.
S 424-025
(6)
Use the adapter to install the valve body on the lower surface of the fuel tank.
