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AD/F100/82 Amdt 1 - Piccolo Tube Peri-Seals
Fokker F100 (F28 Mk 100) Series AeroplanFokker F100 (F28 Mk 100) Series Aeroplanes
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Fokker F100 (F28 Mk 100) Series Aeroplanes
| AD/F100/82 Amdt 1 | Piccolo Tube Peri-Seals | 11/2007 |
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| Applicability: | Fokker Aircraft B.V. Model F28 Mark 0070 and Mark 0100 aircraft, all serial numbers, unless modified per Fokker Service Bulletin SBFI00-30-022. |
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| Requirement: | 1. Inspect the Piccolo Tubes and their surrounding area and replace the Peri-seals in accordance with Part 3 Accomplishment Instructions of Fokker Service Bulletin SBF100-30-028 dated 18 May 2006 or a later NAA approved revision.2. Do not install a spare wing leading edge section on any of the aircraft affected by this directive, unless it has been modified in accordance with CSBD14000-57-007 or a later NAA approved revision.Note: EASA AD 2007-0229 dated 25 August 2007 refers. This AD supersedesCAA-NL AD NL-2006-011. |
| Compliance: | 1. Remains unchanged as: Within the next 4,000 flight hours or 24 calendar months after the effective date of 23 November 2006 (the original issue of this AD), whichever occurs first, unless previously accomplished.2. From 15 August 2008. |
| This Amendment becomes effective on 25 October 2007. | |
| Background: | In 1997, Fokker introduced a new type of Peri-seal (SBF100-30-022). The old type was known to be subject to deterioration, which, in combination with improper installation, can cause leakage 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. Analysis at the time showed that any resulting damage (known to occur at inboard positions only) would not affect the wing load capability. For this reason, the modification was not classified as MANDATORY and no AD action was warranted. However, through a recent occurrence, it was discovered that 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. |