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:
During receipt of spare parts at the final assembly line, it was discovered that lugs of the assembly nut * * * had been inverted (wrong orientation of the braking pin) during manufacturing process at the supplier. * * * This lug inversion could give the illusion of correct torque whereas the affected parts are not properly connected. Loose connection could lead to loss of the fire extinguishing system integrity and therefore inability to ensure the adequate agent concentration. In combination with an engine fire event, it could result in a temporary uncontrolled engine fire, which constitutes an unsafe condition.
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The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.