AD 2011-05-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Thielert Aircraft Engines GmbH Models TAE 125-02-99 and TAE 125-02-114 Reciprocating Engines |
Unsafe Condition
Fracture of the timing chain has occurred due to chain wear, which could lead to in-flight engine shutdown.
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Required Actions
Replace the timing chain within specified flight hours or after the effective date, depending on engine serial numbers. For engines listed in Table 1, replace within 600 flight hours-since-new or 55 flight hours after the effective date. For other engines, replace within 910 flight hours-since-new or 55 flight hours after the effective date. Thereafter, replace the timing chain every additional 910 flight hours.
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Compliance Time
Within 55 flight hours after the effective date or within specified flight hours-since-new, whichever occurs later.
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Affected Aircraft
Thielert Aircraft Engines GmbH models TAE 125-02-99 and TAE 125-02-114 reciprocating engines installed in Cessna 172 and F172 series, Piper PA-28 series, APEX DR 400 series, and Diamond Aircraft Industries Models DA 40, DA 42, and DA 42M NG airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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