EASA AD 2017-0256
SUPERSEDED BY EASA AD 2018-0006
Summary
EASA Airworthiness Directive 2017-0256 is an airworthiness directive issued for Leonardo AW189 helicopters equipped with Aero Sekur Emergency Flotation System (EFS) float assemblies. It addresses corrosion found on the banjo fittings of the EFS float assemblies, which could impair the helicopter's buoyancy in a ditching event. The directive requires inspection and corrective actions to ensure continued airworthiness and safety.
What Changed
This directive introduces a one-time visual inspection requirement for all banjo fittings P/N 311793A on affected EFS float assemblies, along with replacement of any corroded parts and application of corrosion inhibiting compounds. It also sets conditions for the installation of these float assemblies on helicopters, ensuring that only inspected and corrosion-free parts are installed.
Why It Matters
This directive is critical for operators and maintenance organizations to prevent potential failure of the emergency flotation system, which is vital for helicopter safety during water ditching. Compliance ensures the helicopter maintains its buoyancy capability, reducing risk to crew and passengers. It also provides clear maintenance instructions and deadlines to maintain regulatory compliance.
What To Do
Operators must visually inspect all banjo fittings on affected EFS float assemblies within 6 to 12 months depending on modification status. Any corroded fittings must be replaced before the next flight. Corrosion inhibiting compounds must be applied concurrently with inspection or corrective actions. Installation of affected float assemblies is only allowed if these requirements are met prior to installation.
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