Airworthiness Directives; Airbus Model A300 Series Airplanes, Airbus Model A300 B4-600 Series Airplanes, Airbus Model A300 B4-600R Series Airplanes, and A310 Series Airplanes

Résumé

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: During a maintenance check performed by an A310 operator, the recommended modification of the lower attachment beam of rack 101VU by accomplishment of Airbus Service Bulletin (SB) A310-53-2076 was embodied on the aeroplane, leading the operator to find three cracks on the FR15A crossbeam above the NLG [nose landing gear] box at the splicing with rack 107VU fitting. This condition, if not detected and corrected, could degrade the structural integrity of the crossbeam on NLG FR15A web attachment fitting of rack 107VU. Rack 107VU contains major airworthiness system components whose functioning could be adversely affected by the loss of the attachment fitting. As the A300 and A300-600 aeroplanes share this design feature, they are also affected. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.