AD 2011-27-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Turbomeca Turboshaft Engines |
| engine | Turbomeca | Turboshaft | Airworthiness Directives; Turbomeca Turboshaft Engines |
Unsafe Condition
Increase in hot gas ingestion and an increase of temperature in the gas generator (GG) turbine rotor, potentially resulting in turbine damage and an uncommanded in-flight shutdown.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform daily checks for normal GG rotor rundown time, free rotation, and no grinding noise. Inspect repaired 2nd stage turbine NGVs for non-conforming hole configuration. Replace the 2nd stage turbine NGV, 1st stage turbine disc, and 2nd stage turbine disc if non-conforming holes are found.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within specified compliance times based on accumulated GG Cycles-in-Service (CIS) as detailed in Table 1 of the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Turbomeca Arriel 1B turboshaft engines with M03 modules modified by TU 76 or TU 202, and not modified by TU 148, and if fitted with a repaired 2nd stage turbine nozzle guide vane (NGV).
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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