The Fuel tank sometimes gets filled with the explosive fumes of the aviation fuel.

When the explosive fume of the aviation fuel is present and an electrical or mechanical speak takes place, the fuel tank explodes. Many aifr-planes have exploded due to this type of accident. One in New York, the other in Manila and another Bangkok. This invention will stop this type of accidents and will make flying safer.

Detail Description of The Invention A Film made from Teflon (Poly tetrafluorethene-PTEE) or RYTON (PPS) is used to line the Fuel Tank of an Air- Craft to confine & reduce production of aviation-fuel-fume in the Fuel Tank. By reducing the amount of the fume arising in the Central Fuel Tank on the Jumbo-Jet, the atmosphere in the Fuel-Tank is made safe. At the present time, the air-conditioning unit of airplane discharges the heat from the inside of the Cabin of the plane into the Central-Fuel-Tank, thus warming the aviation-fuel and helps in the production of fuel-fume.

The warmer the temperature, higher is the rate of evaporation of any liquid, even of the jet Fuel (Type 1A).

The fuel is really stored in a very flexible tank made from the film of Teflon (Poly tetrafluorethene-PTEE) or Ryton (PPS). The strength to hold the fuel is provided by the metal-body of the current Fuel-Tank.

The Film Fuel-Tank has only Two holes. There is one hole at the Top of Film Tank (the Fuel-inlet valve) for filling the Tank. The Fuel-inlet has a long corrugated neck attached to the Film-Fuel-Tank.

The second out-let is at the bottom of the Film-Fuel- Tank, through which the Fuel goes out of the Fuel-Tank.

The fuel goes out of the out-let hole of the metal tank to the warming chamber before the aviation fuel goes to the jet-engine to power the air-plane engine.

Now talking about the metal Fuel-tank, inside which the Film-Fuel Tank is located, has a breather-hole at the Top of the Metal Fuel Tank. This breather hole supplies fresh air inside the metal Fuel tank and outside the Film Fuel Tank. In other words, the fresh-air occupies the space between the metal walls and film of the Fuel-Tank.

This breather-hole permits the atmospheric air to come inside the Metal-body of the Fuel Tank, but the atmospheric-air does not enter the Film Fuel Tank and does not come in contact of the aviation fuel.

This breather-hole is necessary to break the vacuum created by the outgoing jet-fuel.

The air coming-in through the breather-hole does not come in contact with the aviation Fuel, since the aviation fuel is enclosed in a plastic-Film Fuel-Tank.

As the aviation fuel is discharged from the Fuel tank for delivery to the air-plane engine, the level of the fuel in the tank goes down and a vacuum is created, which pull down the top level of film of the Film Fuel Tank close to the top level of the aviation fuel.

So there is no room for aviation Fuel to Vaporize inside the Film Fuel Tank. A long corrugated neck is connected to the inlet-valve to permit the Top surface of the Film Fuel Tank to come down as the fuel keeps going out to power the engine of the plane.

All the time, the space between the Metal Fuel-Tank and the Plastic Fuel-Tank is filled with pure air only, hence not inflammable.

The material to be needed for manufacturing the Plastic Film Fuel Tank will be completely impervious to the fume of aviation fuel. The imperimeability of the film (plastic) will be the most important requirement in the selection of the material (plastic) to be needed for making the Plastic Film-Fuel-Tank.