| 摘要 |
To provide a nitrogen enriched air (NEA) supply system which easily maintains low the concentration of oxygen within a tank before fueling. In the present invention, a subsidiary pipe 20b that directly supplies NEA to a spill-back pipe 23 is provided. In a descent phase of an aircraft, the NEA is supplied to a second fuel tank 17 from the subsidiary pipe 20b. When the second fuel tank 17 is fueled after landing, the stored NEA is pushed out into a first fuel tank 15 through the spill-back pipe 23 by fuel F. Thus, the concentration of oxygen within the first fuel tank 15 can be also maintained low. Accordingly, it is possible to cut out the need for supplying the NEA before fueling, and thereby fuel the fuel tank while avoiding fuel explosion. |
