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:
[L]eakage of hot wing anti-icing air from the Peri-seal housing. This results in an uncontrolled flow of high-pressure hot air to enter the forward (anti-icing) plenum chamber of the wing leading edge, potentially damaging the anti-icing barrier webs. Subsequently, the wing auxiliary spar can also be damaged by high- pressure hot air. * * * [D]eterioration of the Peri-seals enables the piccolo tubes to vibrate, resulting in a broken piccolo tube. This condition, if not corrected, may cause heat damage to the front spar that potentially affects the wing's load capability.
The proposed AD would require actions that are intended to addressthe unsafe condition described in the MCAI.