Nacelles/Pylons — Attachment Pin Corrosion
- Published
- Effective
- Deadline
- Replaces
- CF-2020-51R1
- Replaces
- CF-2020-51
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected De Havilland DHC-8-401 and DHC-8-402 aircraft must perform detailed visual inspections and necessary rectifications of nacelle and landing gear attachment pins according to specified service bulletins. Compliance deadlines vary based on flight cycles and years in service but generally require action before 14 years or 30,000 flight cycles, or within four years or 8,000 flight hours from the original AD effective date of 2020-12-09. Incorporation of approved service bulletin revisions also satisfies the directive requirements.
Summary
Canadian Airworthiness Directive CF-2020-51R2 addresses corrosion issues in the attachment pins of nacelles and pylons on De Havilland DHC-8-401 and DHC-8-402 aircraft, specifically serial numbers 4001, 4003 through 4550, and 4583 through 4590. The directive mandates inspections and corrective actions to prevent premature corrosion and potential failure of nacelle to landing gear and wing rear spar attachment pins. This directive updates previous versions to clarify applicability and maintain required protective treatments.
What changed
CF-2020-51R2 revises the applicability section by removing the DHC-8-400 model and clarifies which aircraft serial numbers are subject to each part of the directive. It maintains the inspection and rectification requirements from the previous revision CF-2020-51R1 and provides clearer guidance on compliance schedules for affected attachment pins.
Why it matters
This directive is critical for aviation professionals to prevent corrosion-related failures that could lead to single or dual main landing gear collapse. Operators and maintenance teams must ensure compliance to maintain aircraft structural integrity and safety. Understanding the updated applicability and compliance timelines helps avoid operational disruptions and regulatory penalties.
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- EASA AD CF-2026-38Maintenance Requirements Manual Part 2 - Airworthiness Limitation Items - AmendmentAug 17, 2026
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