AD 97-15-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Burkhart Grob Luft-Und | GROB G 109 | Airworthiness Directives; Burkhart Grob, Luft-und Raumfahrt, Model G 109 Sailplanes |
| aircraft | Burkhart Grob Luft-Und | GROB G 109B | Airworthiness Directives; Burkhart Grob, Luft-und Raumfahrt, Model G 109 Sailplanes |
Unsafe Condition
Rudder vibration problems during testing could result in structural damage and eventual loss of control of the sailplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install a new damper unit and rudder bell crank lever, modify existing damper unit and rudder bell crank lever if previously modified, and re-calculate weight and balance data according to specified service bulletins and installation instructions.
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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 Model G 109 sailplanes (serial numbers 6001 through 6159)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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