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:
An operator of an A300-600 aeroplane reported finding a cracked pylon fuel drain pipe on engine 1. * * *
* * * The pipe drains the double wall of the wing-to-pylon junction in the event of fuel leakage.
After investigation, it was concluded that the damage of the pylon fuel drain pipe had been caused by chafing of the pipe against over-length screws that had been installed in accordance with the Illustrated Parts Catalogue (IPC) during a maintenance phase of the Lower Aft Pylon Fairing (LAPF).
This condition, if not detected and corrected, could, in combination with fuel leakage in the pylon, lead to an accumulation of fuel inthe lowest point of the LAPF. As high temperatures are present within the LAPF, and without ventilation, this could result in fuel (vapour) ignition and consequent fire.
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The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.