Fokker F50 (F27 Mk 50) Series Aeroplanes
Fokker F50 (F27 Mk 50) Series Aeroplanes
Fokker F50 (F27 Mk 50) Series Aeroplanes
| AD/F50/100 | Flap Mechanical Drive | 5/2009 |
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| Applicability: | Model F27 Mark 050, Mark 0502 and Mark 0604 aircraft, all serial numbers, if in a post-SBF50-27-030 configuration. |
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| Requirement: | Action in accordance with the requirements of EASA AD 2009-0047.Note: Fokker Services SBF50-27-043 original issue, or later EASA approved revision, refers. |
| Compliance: | As specified in the requirement document, with a revised effective date of7 May 2009. |
| This Airworthiness Directive becomes effective on 7 May 2009. | |
| Background: | Extensive damage was found on a Fokker 50 left hand inner flap and nacelle during a walk-around check. The damage had been caused by a broken fork of the inner flap outboard driveshaft; and resulted in asymmetric flap extension, and interference between the flap and nacelle. A metallurgical investigation revealed that the fork end failed in a fatigue mode, and most probably caused by the “cyclic load” as a result of regularly reaching the mechanical end stop position. This condition, if not corrected, could lead to further cases of asymmetric flap extension, possibly resulting in loss of control of the aircraft. |
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David Villiers
Delegate of the Civil Aviation Safety Authority
17 March 2009