AD 2006-23-17
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Turbomeca | Turmo IV A and IV C Series | Airworthiness Directives; Turbomeca Turmo IV A and IV C Series Turboshaft Engines |
Unsafe Condition
Centrifugal compressor intake wheel blade cracks, which can result in engine in-flight power loss, engine shutdown, or forced landing.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Borescope-inspect and either eddy current-inspect or ultrasonic-inspect the centrifugal compressor intake wheel blades. Replace cracked blades or those with evidence of corrosion pitting with serviceable parts. For engines not modified to TU 191, TU 197, or TU 224 standards, perform borescope inspections at more frequent intervals.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 200 flight hours for pre-TU 191 and pre-TU 224 engines; within 1,000 flight hours for post-TU 191 or post-TU 224 engines.
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Affected Aircraft
Turbomeca Turmo IV A and IV C series turboshaft engines installed on but not limited to Aerospatiale SA 330-PUMA helicopters.
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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