AD 91-12-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Burkhart Grob Luft-Und | GROB G 109B | Airworthiness Directives; GROB LUFT UND RAUMFAHRT Model G 109B Motor Gliders |
Unsafe Condition
Separation of the studs in the root rib stud plate (part number 109B-4108) could result in loss of the aileron and airbrake control systems.
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Required Actions
Inspect the security of the studs in the root rib stud plate (part number 109B-4108) per GROB Service Bulletin No. TM-817-29. If loose studs are found, repair the stud plate prior to further flight. Special flight permits may be issued under FAR 21.197 and 21.199 to operate to a repair location.
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Compliance Time
within the next 3 calendar months after the effective date of this AD, unless already accomplished
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Affected Aircraft
GROB LUFT UND RAUMFAHRT Model G 109B motor gliders (serial numbers 6200 through 6362)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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