Main Rotor Drive - Main Transmission Housing Assembly - Inspection
- Published
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- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected Bell Textron Inc. helicopter models must conduct initial and repetitive inspections of the main transmission housing assembly for cracks, corrosion, and pitting within specified timeframes, including an initial fluorescent penetrant inspection before reaching 6,300 hours time-in-service or within 300 hours for those already above 6,000 hours. Any detected damage beyond defined limits must be repaired or parts removed from service using FAA-approved methods. Compliance with these inspections and corrective actions is mandatory starting December 27, 2022.
Summary
Airworthiness Directive 2022-20-14 is a final rule issued by the Federal Aviation Administration addressing Bell Textron Inc. helicopters including models 204B, 205A, 205A-1, 205B, 210, 212, 412, 412CF, 412EP, and various restricted category helicopters. This directive mandates repetitive inspections of the main transmission housing assembly for cracks, corrosion, and pitting due to reported cracks in the main transmission support case. The directive aims to ensure continued airworthiness and safety of these helicopter models by identifying and correcting potential structural issues.
What changed
This new Airworthiness Directive introduces mandatory repetitive inspections of the main transmission housing assembly, including visual and fluorescent penetrant inspections, at specified intervals based on hours time-in-service. It requires removal or repair of affected parts if damage or cracks are detected, with specific compliance timelines adjusted to allow some flexibility. The directive also clarifies repair options and inspection thresholds without mandating exclusive reliance on manufacturer manuals.
Why it matters
This directive is critical for aviation professionals as it addresses a safety risk related to cracks in the main transmission support case, which could lead to mechanical failure if undetected. Operators and maintenance organizations must implement these inspections to prevent unsafe conditions and ensure regulatory compliance. The directive also impacts maintenance planning and resource allocation due to required inspection intervals and potential repairs or part replacements.
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