AD Amdt-39-10895
Unsafe Condition
Water penetration into the elevator and trim tab due to inadequate drainage can lead to delamination of the structure, resulting in elevator imbalance and flutter.
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Required Actions
Inspect the elevator and trim tab for water. Ensure necessary drain holes are installed and existing holes are open. Drill any required drain holes and open closed holes. If more than 1/2 liter of water is found, verify that the elevator's weight, residual momentum, and glider's center of gravity are within flight manual limits, and adjust as necessary.
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Compliance Time
Before further flight
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Affected Aircraft
Burkhart GROB Luft-und Raumfahrt GmbH Model G 109B gliders
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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