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 1.  General
_______
 A.  The vent valve in the fueling manifold lets fuel trapped in the fueling manifold drain.
 B.  This procedure contains two tasks. The first task removes the vent valve. The second task installs the vent valve.
 TASK 28-21-09-004-012
 2.  Remove the Vent Valve (Fig. 401)
_____________________
 A.  References
 (1)
AMM 28-11-00/201, Fuel Tanks

 (2)
AMM 28-11-01/401, Main Tank Access Door

 (3)
AMM 28-26-00/201, Defueling

 B.  
Access

 (1)  
Location Zone 642 Main Tank - Rib No. 17 to No. 21 (Right)

 (2)  
Access Panel
 642AB Main Tank Access Door (Right)

 C.  
Procedure

 S 654-013
 (1)
Defuel the right main fuel tank (AMM 28-26-00/201).

 S 654-014

 (2)
Drain and purge the applicable fuel tank (AMM 28-11-00/201).

 S 014-001

 (3)
Remove the main tank access door, 642AB (AMM 28-11-01/401).

 S 944-022
 WARNING: OBEY THE FUEL TANK ENTRY PRECAUTIONS (AMM 28-11-00/201).
_______ FAILURE TO OBEY THE FUEL TANK ENTRY PRECAUTIONS COULD CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (4) Obey the fuel tank entry precautions (AMM 28-11-00/201).
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MAINTENANCE MANUAL

SEE A VENT VALVE FUELING MANIFOLD FUELING STATION  642AB
VENT STRINGER 
ADAPTER PLATE 
VENT VALVE TUBE 
VENT VALVE  COUPLING 
COUPLING 
FWD  INBD  FUELING MANIFOLD 
A FUELING MANIFOLD VENT VALVE 
Figure 401 Fueling Manifold Vent Valve 

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757 MAINTENANCE MANUAL
 S 014-015
 (5)
Go into the fuel tank.

 S 014-002

 (6)
Find the vent valve.

 S 034-003

 (7)
Remove the coupling from the vent valve.

 S 034-016

 (8)
Discard the O-ring.

 S 034-004

 (9)
Loosen the coupling from the adapter plate.
　
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本文鏈接地址：757 AMM 飛機維護(hù)手冊 燃油 CHAPTER 28 - FUEL 2(86)