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 1.  General
_______
 A.  There is one sump drain valve installed at each fuel sump location. Fuel sumps are located at the low point of each main fuel and surge tank. There are two fuel sump drain valves in the center fuel tank. The fuel sump drain valves remove collected fuel, water and contaminants. Removal of fuel remaining in the fuel tanks after tank defueling, is also through the sump drain valves.
 B.  This procedure contains intructions for four tasks. The first task is to remove the drain valve and flapper assembly.
 NOTE: To remove the drain valve and flapper assembly you must
____
 go into the applicable fuel tank.

 The second task is to install the drain valve and flapper assembly. The third task is to remove the drain valve.
 NOTE: To remove the drain valve you do not have to go into
____
 the applicable fuel tank.

 The fourth task is to install the drain valve.
 TASK 28-11-05-004-001
 2.  Remove 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 (Major Zones 100 and 200) Access Doors and Panels

 (2)
AMM 28-11-00/201, Fuel Tanks (Purging and Entry)

 (3)
AMM 28-11-01/401, Main Tank Access Door

 (4)
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)

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 28-11-05
 ALL  ú ú 01 Page 401 ú May 28/99

A

757
MAINTENANCE MANUAL

FLAPPER
FLANGE 
TANK 
DRAIN VALVE  SUMP 
FITTING 
DRAIN VALVE  SEE  A 
DRAIN VALVE  SEE B  0-RING 
SEE  A 
FLAPPER 
VALVE  LOWER 
POPPET  BODY  SURFACE 
VALVE  OF FUEL TANK 
DRAIN VALVE 
A 

FLAPPER LOWER SURFACE
VALVE OF FUEL TANKBODY
O-RING FLANGE
POPPET TANK
VALVE SUMPDRAIN FITTINGLINE 0-RING
　
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本文鏈接地址：757 AMM 飛機(jī)維護(hù)手冊(cè) 燃油 CHAPTER 28 - FUEL 2(2)