AD 98-12-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Stemme GmbH & Co. KG | Stemme S10 | Airworthiness Directives; Stemme GmbH & Co. KG Models S10 and S10-V Sailplanes. |
| aircraft | Stemme GmbH & Co. KG | Stemme S10-V | Airworthiness Directives; Stemme GmbH & Co. KG Models S10 and S10-V Sailplanes. |
Unsafe Condition
Engine valve malfunction due to brownish-black sticky residue on engine valve shafts and contaminated fuel filter with chopped cotton fibers, which could cause engine failure during flight and loss of control of the sailplane.
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Required Actions
Insert a revision in the flight manual's Limitations Section specifying only AVGAS 100LL fuel, inspect and replace contaminated fuel filters, and inspect engine valve shafts for residue requiring cleaning if found. Actions must follow specified service bulletins.
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Compliance Time
Within 30 days after the effective date (July 17, 1998) for flight manual revision; within 60 days after the effective date for fuel filter and engine inspections.
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Affected Aircraft
Stemme GmbH & Co. KG Models S10 (serial numbers 10-12 through 10-60) and S10-V (serial numbers 14-002 through 14-022 and transformed 14-012M to 14-060M) sailplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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