Document ID: chunk:federal_register_of_legislation:F2007L03973:body:0:p2
Version: federal_register_of_legislation:F2007L03973
Segment Type: other
Provision Reference: 
Character Range: 2808–4213

deterioration of the Peri-seals enables the piccolo tubes to vibrate, resulting in a broken piccolo tube.  In this case, the location of the failure was more outboard than previous occurrences.  This condition, if not corrected, may cause heat damage to the front spar that potentially affects the wing's load capability.

   Since an unsafe condition has been identified that is likely to exist or develop on aircraft of this type design, this Airworthiness Directive requires inspection of the Piccolo Tubes and the surrounding structure to establish correct installation, as well as the replacement of the 460-series Peri-seals by the improved 600-series, which have a higher temperature limit.  A new MRB task will be introduced to require the repetitive replacement (life limit) of the new Pen-seals to prevent long-term degradation.

   Since the issuance of original issue of this AD, Fokker has developed a modification, published as Component Service Bulletin (CSB) D14000-57-007, for spare wing leading edge sections that may still contain the 460-series Peri-seals.  For that reason, this AD retains the requirements of AD NL-2006-011 and adds a limit for the allowed use of unmodified wing leading edge section as replacement part.

   The original issue of this AD became effective on 23 November 2006.

Charles Lenarcic
Delegate of the Civil Aviation Safety Authority

10 September 2007