Main Rotor Drive – Main Gearbox Magnetic Plug and Oil Filter – Inspection / Modification
Superseded. Comply with 2021-0016, 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 must inspect the main gearbox magnetic plug during each after last flight inspection or every 10 flight hours, and inspect the oil filter every 25 flight hours. If particles are detected, analysis and corrective actions must be taken before the next flight. Group 1 helicopters must replace the affected magnetic plug with an improved part within 110 flight hours or 3 months from the effective date. Installation of affected parts is prohibited after modification or from the effective date for Group 2 helicopters.
Summary
EASA Airworthiness Directive 2020-0156 is an airworthiness directive issued for Airbus Helicopters SA 365 C1, C2, and C3 models. It addresses the inspection and modification of the main gearbox magnetic plug and oil filter to detect particles indicative of planet gear spalling. This directive applies to all manufacturer serial numbers of these helicopter models.
What changed
This directive introduces mandatory inspections of the main gearbox magnetic plug during each after last flight inspection or every 10 flight hours, and the oil filter every 25 flight hours. It also requires replacement of affected magnetic plugs with improved parts for helicopters without a prior modification (mod 0763B19). The directive is an interim action pending further regulatory updates.
Why it matters
This directive is critical for aviation professionals because it enhances the detection of potential planet gear failures in the main gearbox, which if undetected, could lead to gear seizure and loss of helicopter control. Operators and maintenance teams must comply to ensure continued airworthiness and safety, preventing catastrophic mechanical failures. Compliance helps avoid operational disruptions and regulatory penalties.
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