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 B.  This procedure contains two tasks. The first task removes the drain check valve. The second task installs the drain check valve.
 TASK 28-13-08-004-001
 2.  Remove the Drain Check Valve (Fig. 401)____________________________
 A.  References
 (1)
AMM 28-11-01/401, Main Tank Access Door

 B.  
Access

 (1)  
Location Zones
 542 Main Tank - Rib No. 17 to No. 21 (Left)
 642 Main Tank - Rib No. 17 to No. 21 (Right)

 (2)  
Access Panels
 542DB Main Tank Access Door (Left)
 642DB Main Tank Access Door (Right)

 C.  
Procedure

 S 014-002
 (1)
Remove the main tank access door, 542DB or 642DB (AMM 28-11-01/401).

 S 034-003

 (2)
Remove the four bolts and washers from the drain check valve.

 (3)
Remove the drain check valve.

 S 024-008
 TASK 28-13-08-404-004
 3.  Install the Drain Check Valve (Fig. 401)_____________________________
 A.  References
 (1) AMM 28-11-01/401, Main Tank Access Door
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 ALL  ú ú 01 Page 401 ú May 28/99

A

757
MAINTENANCE MANUAL

DRAIN CHECK VALVE
SEE A
DRAIN CHECK VALVE
SEE A
END RIB
BOLT, WASHER (4 LOCATIONS)
FLAPPER OF THE DRAIN CHECK VALVE FWD
DRAIN CHECK  INBD 
VALVE 
DRAIN CHECK VALVE 
A 

Drain Check Valve
Figure 401

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 28-13-08
 ALL  ú ú 01 Page 402 ú May 28/99

A

757
MAINTENANCE MANUAL

 B. Access
 (1)  
Location Zones
 542 Main Tank - Rib No. 17 to No. 21 (Left)
 642 Main Tank - Rib No. 17 to No. 21 (Right)

 (2)  
Access Panels
 542DB Main Tank Access Door (Left)
 642DB Main Tank Access Door (Right)

 C.
Procedure

 S 424-005
 (1)  
Align the drain check valve with the end rib.

 S 424-006

 (2)  
Install the four bolts and washers on the drain check valve.
　
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