AD 2011-09-19
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; BURKHART GROB LUFT-UND Model G 103 C Twin III SL Gliders |
Unsafe Condition
The in-flight loss of a propeller and pulley wheel from the engine of a Grob G 103 C Twin III SL powered sailplane has been reported. Grob Aircraft AG suspects that the possible reasons for this loss can be due to an incorrect propeller track (the play at the propeller tip) and/or to a damaged propeller nut securing plate.
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Required Actions
Inspect for cracks at the bent area of the engaged tooth of the upper pulley wheel securing plate. Verify that the propeller track is within the allowable tolerances. Update glider documentation as specified in Grob Aircraft Service Bulletin No. MSB-869-24/1. Depending on findings, accomplish relevant corrective actions.
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Compliance Time
Within 30 days after the effective date of this AD (June 15, 2011).
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Affected Aircraft
BURKHART GROB LUFT-UND G 103 C Twin III SL gliders, all serial numbers, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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