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 2.  Vent System Tubing (Fig. 1)__________________
 A.  The vent system tubing is installed in each fuel tank to complete the vent system from the sealed skin stringers into the tank. Most of the tube assemblies consist of two or more sections of tubing connected with standard couplings. Each tube is provided with a float-actuated drain valve located at a point in the line that is lowest when the airplane is in a normal attitude. Both tubes in the center wing tank and the outboard tubes in the wing tanks incorporate float-actuated vent valves. Each tube is connected to the skin stringers by a flanged elbow connection and is secured to the tank structure with support clamps and brackets. The reserve tank vent tubes do not connect to sealed wing stringers but continue from the tank directly into the surge tanks.
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NOTE:VENT STRINGERS NOT SHOWN INRESERVE TANK FOR CLARITY.

Fuel Vent System Component Location
Figure 1 (Sheet 1)

A
747-400
MAINTENANCE MANUAL

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A
747-400
MAINTENANCE MANUAL

VENT TUBE  PRESSURE 
INLET  VALVE RELIEF  FLAME ARRESTER (INSIDE  SCOOP FUEL VENT 
SURGE TANK  VENT TUBE) 
SURGE TANK  VENT TUBE 
DRAIN LINES 
(REF) 

SURGE TANK WING TIP
DRY BAY FUEL VENT DRAIN VALVE INBD
FWD  A
VENT DRAIN FUEL TANK VALVE VENT PORT
VENT FUEL TANKU-TUBE
VENT PORTS VENT TUBE
VENT FLOAT VALVE VENT DRAIN VALVE VENT TUBEINBD VENT
FLOAT
FWD  B VALVE VENT DRAIN
VALVE
Fuel Vent System Component Location Figure 1 (Sheet 2)
G54645
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A
747-400 MAINTENANCE MANUAL
VENT TUBE
WS  VENT TUBE 
1084  (4 PLACES) 
FWD  C
INBD 
FWD 
INBD 
VENT TUBE 
(2 PLACES) 
D 
WS 
1056 
FWD 
1028 WS  E  INBD 
Fuel Vent System Component Location 
Figure 1 (Sheet 3) 

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A
747-400
MAINTENANCE MANUAL

FWD 
INBD  SEALED STRINGER WING 
VALVE DRAIN VENT 
944.50 WS  (2 LOCATIONS) FLOAT VALVE VENT MIDSPAR 
VALVE VENT DRAIN  VENT DRAIN VALVE 
VENT FLOAT VALVES 
TUBE VENT  MAIN TANK INBOARD 
SEE  H 
MAIN TANK OUTBOARD  VALVE VENT FLOAT 
FWD INBD  TUBE VENT DRAIN VALVE VENT FLOAT VALVE VENT DRAIN Fuel Vent System Component Locaton Figure 1 (Sheet 4) VALVE VENT DRAIN G  VALVE VENT DRAIN H 

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A
747-400
　
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本文鏈接地址：747-400 AMM 飛機維護手冊 燃油 FUEL 1(133)