AD 98-24-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Burkhart Grob Luft-Und | GROB G 109B | Airworthiness Directives; Burkhart GROB Luft-und Raumfahrt GmbH Model G 109B Gliders |
Unsafe Condition
Water penetration into the elevator and trim tab due to inadequate drainage could result in delaminated elevator and trim tab structure with consequent elevator imbalance and flutter.
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Required Actions
Inspect the elevator and trim tab for water and ensure necessary drain holes are installed and existing ones are open. Drill any needed drain holes and open closed ones. If over 1/2 liter of water is found, adjust elevator weight, residual momentum, and glider center of gravity to meet flight manual limits.
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Compliance Time
Within the next 6 calendar months after the effective date of this AD
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Affected Aircraft
Burkhart GROB Luft-und Raumfahrt GmbH Model G 109B gliders, all serial numbers beginning with 6200
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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