AD 2016-12-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Various Aircraft Equipped With BRP-Powertrain GmbH & Co KG 912 A Series Engine |
| engine | Rotax | Aircraft | Airworthiness Directives; Various Aircraft Equipped With BRP-Powertrain GmbH & Co KG 912 A Series Engine |
Unsafe Condition
A design change of the engine cylinder head temperature sensor without a concurrent revision of the engine model designation, engine part number, or cockpit indication to the pilot. This change substitutes the previous cylinder head temperature (CHT) measurement with a coolant temperature (CT) measurement, which could lead to engine in-flight shutdown and potential forced landing due to undetected coolant limit exceedances.
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Required Actions
Inspect the engine configuration to determine if the new cylinder heads are installed. Reidentify the engine if necessary. Modify the affected aircraft, as required by the Type Certificate (TC) or Supplemental Type Certificate (STC) holder, to indicate the Maximum Coolant Temperature requirement.
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Compliance Time
Before further flight
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Affected Aircraft
Various aircraft equipped with BRP-Powertrain GmbH & Co KG 912 A series engine, specifically those with part numbers 413235 or 413236 cylinder heads installed in position 2 or 3.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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