AD NUMBER: 2008-08-18
MANUFACTURER: Fokker
SUBJECT: Airworthiness Directive 2008-08-18
SUMMARY: We are adopting a new airworthiness directive (AD) for the products listed above. This 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. We are issuing this AD to require actions to correct the unsafe condition on these products.

FMI: www.faa.gov/regulations_policies/airworthiness_directives/