Fire Protection – Engine Fire Control Panel – Modification
Superseded. Comply with 2025-0196, which replaces this document.
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of EC 175 B helicopters must modify the affected wiring harnesses and connectors in accordance with Airbus Helicopters Alert Service Bulletin EC175-88-00-0001. This modification must be completed within 440 flight hours or 6 months from the effective date of 7 July 2022, whichever occurs first.
Summary
EASA Airworthiness Directive 2022-0121 is an airworthiness directive issued by the European Union Aviation Safety Agency affecting Airbus Helicopters EC 175 B models. It addresses an issue with the engine fire control panel wiring that prevents the actuation of the second fire extinguishing bottle for engine 2 under certain configurations. This directive mandates a wiring modification to restore normal fire extinguishing system functionality.
What changed
EASA Airworthiness Directive 2022-0121 introduces a mandatory wiring modification (mod 99A06423) for the engine fire control panel harnesses and connectors on EC 175 B helicopters. This modification corrects the inability to actuate the second fire extinguisher bottle for engine 2 when the first bottle has already been used, a problem identified in helicopters equipped with Helionix V6 and V8 systems.
Why it matters
This directive is critical for helicopter operators and maintenance organizations because failure to comply could result in an inability to extinguish an engine fire, potentially leading to loss of control of the aircraft. Ensuring compliance maintains the safety and airworthiness of the EC 175 B fleet and aligns with regulatory requirements for continuing airworthiness.
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