Main Rotor — Upper and Lower H Legs — Service Life Limit
- Published
- Effective
- Replaces
- 2021-0192
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of EC 175 B helicopters with affected main rotor H legs must replace these parts with serviceable ones before they exceed 10 years since manufacture, following the compliance times specified in the directive. From the effective date of 13 November 2025, installation of affected parts is only allowed if they are serviceable and will be replaced as required. Compliance must be achieved in accordance with Airbus Helicopters Alert Service Bulletin EC175-04A003 Revision 4 and within the specified deadlines.
Summary
EASA Airworthiness Directive 2025-0227 is issued for Airbus Helicopters EC 175 B models, addressing the service life limits of the main rotor upper and lower H legs. This directive mandates replacement of affected parts that have reached or are nearing 10 years since manufacture to prevent potential structural failure. It applies to all serial numbers of the EC 175 B helicopter and updates previous service life limitations.
What changed
EASA AD 2025-0227 supersedes the previous AD 2021-0192 by expanding the list of affected main rotor H legs and clarifying the definition of the affected part's manufacture date. It introduces additional affected parts to the Alert Service Bulletin EC175-04A003 Revision 4 and updates compliance instructions for part replacement and installation. The directive retains the 10-year retirement life limit but provides more detailed guidance on part identification and compliance timing.
Why it matters
This directive is critical for maintaining the structural integrity and safe operation of EC 175 B helicopters by preventing cracks in the main rotor H legs due to aging. Operators, maintenance organizations, and compliance teams must ensure timely replacement of parts to avoid potential loss of helicopter control. Adhering to these updated service life limits helps mitigate safety risks and ensures regulatory compliance under EASA regulations.
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