AD 98-24-20
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Burkhart Grob Luft-Und | GROB G 109 | Airworthiness Directives; Grob Luft-und Raumfahrt, GmbH Models G 109 and G 109B Sailplanes |
| aircraft | Burkhart Grob Luft-Und | GROB G 109B | Airworthiness Directives; Grob Luft-und Raumfahrt, GmbH Models G 109 and G 109B Sailplanes |
Unsafe Condition
Fatigue cracking of the landing gear legs could result in landing gear failure with consequent loss of control during landing operations.
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Required Actions
Inspect the retaining bars' chamfer radius and install reinforcing plastic strips if the radius is 3.0 mm or greater. Replace retaining bars with improved design if chamfer radius is less than 3.0 mm. Inspect landing gear legs for cracks and proper thickness; polish out cracks under 0.5 mm depth or replace legs if cracks exceed 0.5 mm or thickness is insufficient.
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Compliance Time
Within the next 120 calendar days after the effective date of this AD for retaining bars inspection. For landing gear legs not equipped with P/N 109B-5001.01/1: within the next 100 hours TIS after the effective date or upon 1,000 hours TIS, whichever is later, and thereafter every 500 hours TIS.
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Affected Aircraft
Grob Luft-und Raumfahrt GmbH Models G 109 and G 109B sailplanes, all serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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