AD 2021-05-22
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Turbomeca | Various | Airworthiness Directives; Safran Helicopter Engines, S.A. (Type Certificate Previously Held by Turbomeca, S.A.), Turboshaft Engines |
| engine | Safran | Helicopter | Airworthiness Directives; Safran Helicopter Engines, S.A. (Type Certificate Previously Held by Turbomeca, S.A.), Turboshaft Engines |
Unsafe Condition
Positive segregation (freckles) was detected on Stage 2 high-pressure turbine (HPT) disks and Stage 3 turbine wheels manufactured from a certain block of material. This condition, if not corrected, could lead to HP turbine disc failure and result in high-energy debris release, with consequent damage to, and reduced control of, the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service and replace affected Stage 2 HPT disks for Safran Helicopter Engines Arriel 1B, Arriel 1C, Arriel 1C2, and Arriel 1D1 model turbofan engines. Remove from service and replace each affected Stage 3 turbine wheel for Safran Helicopter Engines Astazou XIV B and Astazou XIV H model turbofan engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
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Affected Aircraft
Safran Helicopter Engines Arriel 1B, Arriel 1C, Arriel 1C2, Arriel 1D1, Astazou XIV B, and Astazou XIV H model turboshaft engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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