AD 2021-26-25
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Schempp-Hirth Flugzeugbau GmbH Gliders |
Unsafe Condition
Occurrences were reported of experiencing jerky extension of the airbrakes at very high air speeds, in some cases of which the airbrake blades interlocked. An increasing number of age-related damage was observed on a specific version (22 mm plastic bushes) of the airbrake end-stops.
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Required Actions
Replace certain air brake end stop plastic bushings with a new version bushing, made of better material. Inspect certain other air brake end stops for sufficient overlap and, depending on findings, accomplish applicable corrective action(s).
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Compliance Time
Before further flight
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Affected Aircraft
Schempp-Hirth Flugzeugbau GmbH Model Duo Discus, Duo Discus C, and Duo Discus T gliders with certain serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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