Engine Exhaust – Nozzle Exhaust Duct Clamp Assembly – Inspection
- Published
- Effective
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected AB139 and AW139 helicopters must perform the initial inspection of the nozzle exhaust duct clamp assembly within 25 flight hours after 1 September 2026 and repeat inspections every 300 flight hours. Any clamp showing damage or cracks must be replaced with a serviceable part before the next flight. Inspection results must be reported to Leonardo within 10 days. Installation of affected parts is only allowed if they are serviceable.
Summary
EASA Airworthiness Directive 2026-0165 is an airworthiness directive addressing the inspection of nozzle exhaust duct clamp assemblies on Leonardo S.p.A. AB139 and AW139 helicopters. It applies to specific serial numbers of these helicopter models and targets clamp assemblies with part numbers 3P7115A10751 or BAS238-6-1300. The directive mandates repetitive inspections to detect damage or cracks that could compromise tail rotor drive shaft safety.
What changed
This new airworthiness directive introduces mandatory repetitive inspections of affected nozzle exhaust duct clamp assemblies within 25 flight hours after the effective date and at intervals not exceeding 300 flight hours thereafter. It requires replacement of any damaged or cracked clamps before further flight and allows installation of only serviceable parts. The directive also establishes reporting requirements for inspection results to Leonardo.
Why it matters
This directive is critical for aviation professionals because failure of the clamp assembly can lead to damage of the tail rotor drive shaft, potentially causing loss of helicopter yaw control. Operators and maintenance organizations must ensure compliance to prevent unsafe conditions and maintain airworthiness. The directive also provides clear guidance on inspection intervals and corrective actions to mitigate risk.
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- EASA AD 2026-0003Time Limits / Maintenance Checks — Airworthiness Limitations Section — AmendmentJan 12, 2026
- EASA AD 2025-0163Rotors Flight Control — Brake Pedal Assembly — Inspection
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