AD 2025-04-14
Unsafe Condition
The fuselage could be temporarily deformed due to forces related to acceleration, which allowed the locking mechanism to move into the open position. These conditions, if not addressed, could lead to the canopy opening in flight, resulting in loss of control of the glider.
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Required Actions
Modifying the canopy locking mechanism by installing a compression spring, installing spring washers at the canopy actuating levers, and modifying the front actuating lever to include a magnet and applying a red mark to the front and aft inside the left canopy frame or installing a front actuating lever that has a magnet.
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Compliance Time
Before further flight
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Affected Aircraft
Schempp-Hirth Flugzeugbau GmbH Model Duo Discus gliders serial numbers (S/Ns) 1 through 422 (inclusive) and Duo Discus T gliders S/Ns 1 through 96 (inclusive), certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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