EASA AD 2025-0199
Power Plant — Pneumatic Line — Check / Inspection / Replacement
Summary
EASA Airworthiness Directive 2025-0199 is an airworthiness directive issued by the European Union Aviation Safety Agency affecting Leonardo S.p.A. A119 and AW119MKII helicopters equipped with Pratt & Whitney Canada PT6B-37A engines. It mandates repetitive acceleration checks and replacement of the rear pneumatic line on affected engines to address potential fuel flow issues caused by trapped residues.
What Changed
This new airworthiness directive introduces mandatory repetitive acceleration checks and inspection procedures for the rear pneumatic line and fuel control unit on affected engines. It also requires replacement of the affected pneumatic line within 300 flight hours or 24 months and provides terminating actions for compliance.
Why It Matters
This directive is critical for operators and maintenance organizations to prevent uncommanded fuel flow changes that could lead to engine instability and reduced helicopter control. Compliance ensures continued airworthiness and operational safety of affected helicopters, avoiding potential in-flight power rollbacks or accelerations.
What To Do
Operators of affected A119 and AW119MKII helicopters must perform acceleration checks within 10 flight hours after 30 September 2025 and then every 50 flight hours. If acceleration limits are exceeded, the affected pneumatic line must be replaced before further flight, and the fuel control unit inspected. Full replacement of the pneumatic line is required within 300 flight hours or 24 months from the effective date.