AD 2004-20-10
Unsafe Condition
Incorrectly locked shear force fitting may cause wing-locking mechanism disengagement, leading to wing unlocking in flight and loss of control.
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Required Actions
Perform operational checks of the front wing-locking mechanism for damage, deformation, and smooth operation. Inspect stop key movement and wing and fuselage side root ribs. Inspect wing side shear force fittings. Replace stop key if residual movement exceeds 2mm. Inspections must be conducted within 25 hours time-in-service after the effective date, with repetitive inspections every 25 hours thereafter.
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Compliance Time
Within 25 hours time-in-service after November 24, 2004
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Affected Aircraft
Valentin GmbH & Co. Taifun 17E sailplanes, all serial numbers except those where Service Bulletin 23-818 has been complied with.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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