Electrical Power — Voltage Regulator Wiring — Replacement
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Group 1 Virus SW 121 series aeroplanes must replace the affected voltage regulator wiring within four months from 25 April 2023. Until replacement, these aircraft are restricted to visual flight rules during daytime, with the AD inserted into the Aircraft Flight Manual. No affected parts may be installed on any aircraft after the effective date.
Summary
EASA Airworthiness Directive 2023-0077 is issued for Pipistrel Vertical Solutions Virus SW 121 series aeroplanes, including SW 121, SW 121A, and SW 121C models. The directive addresses an issue with voltage regulator wiring that may cause fluctuations in electrical power output. It mandates replacement of specific voltage regulator wires to ensure continued airworthiness and safe operation.
What changed
This new Airworthiness Directive introduces a mandatory replacement of affected voltage regulator wires, identified by part numbers 243004A20 and 24301820, with a serviceable part P/N 1212430002. It also imposes a temporary operational limitation restricting affected aircraft to visual flight rules during daytime until the replacement is completed. Additionally, it prohibits installation of the affected parts on any aircraft from the effective date.
Why it matters
This directive is critical for aviation professionals because voltage regulator fluctuations can lead to electrical system malfunctions, potentially reducing aircraft control. Operators and maintenance organizations must comply to maintain aircraft safety and regulatory compliance. The temporary operational limitation affects flight planning and operational flexibility until corrective actions are performed.
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