Engine — Power Turbine Limitations — Operational Limitation
- Published
- Effective
- Deadline
- Replaces
- 2009-0022-E
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must amend the Rotorcraft Flight Manual within 5 flight hours or 10 days from the effective date of 20 August 2018, following Leonardo Service Bulletin 206-252 instructions. Concurrently, a placard must be installed in the cockpit in full view of the pilots. Flight crews should be informed of the changes and operate the helicopter accordingly.
Summary
EASA Airworthiness Directive 2018-0175-E is an emergency directive addressing operational limitations on the power turbine speed of Rolls-Royce Corporation 250-C20 and 250-C20R engines installed on Leonardo AB206B helicopters. This directive updates previous limitations to prevent engine turbine failures that could compromise helicopter control. It applies specifically to AB206B helicopters, including those converted from AB206A models with certain service bulletins embodied.
What changed
EASA Airworthiness Directive 2018-0175-E supersedes the earlier AD 2009-0022-E by introducing amended operational limitations on the power turbine N2 speed range. It requires updating the Rotorcraft Flight Manual with new restrictions and installing a cockpit placard as per Leonardo Service Bulletin 206-252. These changes reflect updated safety assessments and manufacturer recommendations.
Why it matters
This directive is critical for aviation professionals to ensure continued airworthiness and safe operation of affected AB206B helicopters. Operators and maintenance teams must comply to prevent potential engine turbine failures that could lead to loss of helicopter control. Compliance ensures adherence to European aviation safety regulations and avoids regulatory penalties.
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New ADs and bulletins for Leonardo S.P.A. Helicopters AB206 and AB206B, summarized like this page, every Monday.