(2)  
Access Panels
 543AB Surge Tank - Access Door (Left)
 643AB Surge Tank - Access Door (Right)

 C.  
Procedure

 S 012-002
 (1)  Remove the left or right surge tank access door, 543AB or 643AB (AMM 28-11-03/401).
 S 032-003
 WARNING:_______BE CAREFUL WITH A CLOSED PRESSURE RELIEF VALVE. IF THE PRESSURE RELIEF VALVE MOVES QUICKLY, IT CAN CAUSE INJURY.
 (2)  
Remove the four mounting bolts that hold the pressure relief valve to the surge tank access door.

 (3)  
Remove the pressure relief valve.

 S 022-004
 TASK 28-13-04-402-014
 3.  Install the Pressure Relief Valve (Fig. 201)_________________________________
 A.  References
 (1)  
AMM 28-11-03/401, Surge Tank Access Door

 B.  
Access

 (1)  
Location Zones 543 Surge Tank - Rib No. 21 to No. 23 (Left) 643 Surge Tank - Rib No. 21 to No. 23 (Right)

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A 757 MAINTENANCE MANUAL
SEE A
SEE  A  PRESSURE RELIEF VALVE 
O-RING 
BSEE ACCESS DOOR 
(LOWER SURFACE) WING SKIN 
MOUNTING BOLT  CLAMP RING (KNITTED ALUMINUM) GASKET 
DOOR ACCESS  A  BOLT 
T-HANDLE  B Figure 201 Surge Tank Pressure Relief Valve HOLE SENSE PRESSURE 

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A

757
MAINTENANCE MANUAL

 (2)  
Access Panels
 543AB Surge Tank - Access Door (Left)
 643AB Surge Tank - Access Door (Right)

 C.
Procedure

 S 212-005
 (1)  
Make sure the surfaces on the pressure relief valve and the surge tank access door that the O-ring touches are clean and not damaged.

 S 432-006

 (2)
Install a new O-ring which is hydrocarbon fuel resistant.

 S 422-007
 WARNING:_______BE CAREFUL WITH A CLOSED PRESSURE RELIEF VALVE. IF THE PRESSURE RELIEF VALVE MOVES QUICKLY, IT CAN CAUSE INJURY.
 (3)  
Align the pressure relief valve on the surge tank access door.
　
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