时间关系,就不一一翻译了 28-13-00 PB 001 CONF 00 - WINGCENTER TANK EXTERNAL VENTILATING SYSTEM - DESCRIPTION AND OPERATION
The center tank externalventing system:
- |
has a vapor seal membranethat seals the bottom of the center tank from the air conditioning compartment(ZONE 191/192) |
- | lets a flow of air to gothrough the space between the membrane and the bottom of the center tank to airthrough the drain mast |
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lets fuel drain to air through thedrain mast. |
(Ref. Fig. Center Tank -Vapor Seal Area Venting SHEET 1)FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF | ** ON A/C 001-049, 051-099, 101-149, 151-199,201-220, 222-223, 225-227, 229-235, 239-249, 251-265, 301-350, 401-450, 501-509,511-531, 601-607 |
500QM |
MONITOR-LEAK |
195AB |
195 | |
28-13-44 | ** ON A/C 266-299, 351-400, 451-500, 532-600,608-950 |
500QM |
MONITOR-LEAK | |
195 | |
28-13-44 |
** ON A/C ALL
(Ref. Fig. Center Tank -Vapor Seal Area Venting SHEET 1)
The system has:
- | a ventilating air supplypipeline |
The vapor seal is a fabricmembrane that isolates the center tank from the air conditioning compartmentbelow.
Pressurized air from theair conditioning system flows through the space between the vapor seal and thecenter tank. A continuous flow of air is caused by the difference of airpressure (of the air conditioning system) and the ambient air pressure.
A system of drains at therear of the vapor seal move the drainage and ventilating (exhaust) air through adrain mast. A leak monitor in the drain line keeps a small quantity of drainagefor fuel leak analysis.
Vapor Seal The vapor seal membrane isa sheet of composite material (Nomex fabric with Viton rubber) attached to 'Z'members on the underside of the tank with aluminum clamp strips and bolts.
Formed aluminum edgestrips, seal the membrane to the perimeter of the tank. Aluminum fittings areused where the ventilating air supply pipe and the manual magnetic indicator (Ref. AMM D/O 28-43-00-00) passthrough the membrane.
Leak Monitor (Ref. Fig. Leak MonitorSHEET 1)
The leak monitor has aspur pipe that connects to the drain line between the center box and drain mast.A manually operated check valve is installed on the end of the spur pipe. Thecheck valve lets a sample of the drainage to be taken to show if there is anyfuel leakage from the root-ribs of the wing tank. The valve is operated torelease the fuel by depressing the valve piston. This lifts the check valve andlets the fluid flow through the outer valve assembly. Drain Mast
5. |
Operation/Controland Indicating |
The operation of the wingcenter tank external ventilating system is fully automatic. There is no controlof the system and the system gives no indications.

Figure 28-13-00--12400-00-B / SHEET 1 - CenterTank - Vapor Seal Area Venting
Figure 28-13-00--16700-00-B / SHEET 1 - LeakMonitor
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