AD 2008-13-27
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Turbomeca S.A. Arrius 2F Turboshaft Engines |
| engine | Turbomeca | S | Airworthiness Directives; Turbomeca S.A. Arrius 2F Turboshaft Engines |
Unsafe Condition
Fracture of the separator cage of the gas generator front bearing due to high-cycle fatigue cracks initiated in the lubrication slots, leading to gas generator seizing and uncommanded in-flight engine shutdown.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the engine module 02 with a module incorporating Turbomeca Modification Tf 12A, which installs a new gas generator front bearing without lubrication slots on the separator cage. Use Turbomeca Mandatory Service Bulletin No. 319 72 4012, Update No. 1, dated September 19, 2006, for the replacement procedure.
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Compliance Time
At the next engine shop visit after the effective date of this AD, but no later than 30 days after the effective date of this AD.
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Affected Aircraft
Turbomeca S.A. Arrius 2F turboshaft engines that have not incorporated Turbomeca Modification Tf 12A, installed on, but not limited to, Eurocopter EC120B helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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