Fuselage — Wing-to-Fuselage Joint — Moisture Ingress Between Front and Rear Spar Frame Segments
- Published
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- Deadline
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What to do
Operators of affected DHC-8-401 and -402 aircraft must perform visual inspections and applicable corrective actions following De Havilland Service Bulletin 84-53-81, Revision A or later. Aircraft with less than 32,000 flight cycles must comply before reaching 40,000 flight cycles, while those with 32,000 or more flight cycles must comply within 8,000 flight hours or 48 months from December 1, 2022, whichever occurs first.
Summary
Canadian Airworthiness Directive CF-2022-63 addresses moisture ingress issues in the wing-to-fuselage joint of De Havilland Aircraft of Canada Limited DHC-8-401 and -402 aeroplanes, serial numbers 4001 and 4003 through 4624. The directive mandates inspections and retrofits to prevent corrosion and potential structural failure at the front and rear spar frame segments. This AD ensures continued airworthiness and safety of the affected aircraft models.
What changed
CF-2022-63 introduces mandatory visual inspections and retrofit actions to improve sealing at the wing-to-fuselage joint to prevent moisture ingress. It applies different compliance timelines based on the aircraft's accumulated flight cycles and supersedes previous inspection requirements if performed according to earlier service bulletin revisions.
Why it matters
This directive is critical for operators and maintenance organizations to prevent corrosion and structural degradation that could lead to wing separation. Compliance ensures the structural integrity of the wing-to-fuselage joint, maintaining flight safety and regulatory conformity. It also provides clear guidance on inspection intervals and corrective actions to mitigate risks.
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