AD 98-08-29
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Alexander Schleicher GmbH & Co. | ASK 21 | Airworthiness Directives; Alexander Schleicher Segelflugzeugbau Model ASK 21 Sailplanes |
Unsafe Condition
Inaccurate stall and spin recovery information provided in the sailplane flight manual (SFM) could result in the inability to recover from a spin or stall during flight.
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Required Actions
Remove pages 2, 22, 24, 33, and 34 from the Alexander Schleicher Model ASK 21 SFM and replace them with new pages having footnote 'TN 23 dated Jan 1991', in accordance with Technical Note No. 23 dated January 29, 1991. The SFM revisions must be entered into the aircraft records as required by 14 CFR 43.9.
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Compliance Time
within the next 3 calendar months after the effective date of this AD, unless already accomplished
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Affected Aircraft
Alexander Schleicher GmbH & Co. Model ASK 21 sailplanes, serial numbers 21001 through 21495
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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