Abstract:

Since 1959,there have been seventeen aircraft fuel tank lighted accidents,showing that the fuel tank lighted accidents are catastrophic in aircraft safety operation process. These accidents always attract high attention in aviation safety field. Federal Aviation Administration (FAA)continuously fixes the airworthiness rules to satisfy the aircraft safe operation by reducing these risks,but Advisory Circular(AC)is short of systematic analysis. Based on accident investigations,main influencial factors of the fuel tank fire safety are electrical arcs and sparks,filament heating,friction sparks,and hot surface ignition or auto-ignition. And the fuel tank fireproof function devices are quantified. Firstly,with Failure Mode and Effects Analysis(FMEA),each of the function equipments is analyzed to find out the failure mode in different risk status. Secondly,the failure mode level in Risk Priority Number is quantified by three elements method risk state evaluative criteria. At last,according to the component failure mode,tree graph analysis method is employed to manage the fuel tank inside and outside ignition source function elements. Based on the initial analysis of the composites fuel tank special failure mode,a systematic analysis method of the aircraft fuel tank fire safety is proposed.

Key words: ignition resources, FMEA, three elements method, composites fuel tank