Summary
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: * * * under certain conditions, an ignition source may develop in the wing tank vapour space, due to insufficient clearance between the wiring along the Fuel Quantity Tank Units (FQTU's) and the local reinforcing structure around the upper skin cut-out.
This condition, if not corrected, in combination with flammable fuel vapours, could result in a wing tank explosion and consequent loss of the aeroplane.
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The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.