Landing Gear — Alternate Extension System — Cam Assembly Failures
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Affected operators must perform initial inspections within 2400 flight hours or 12 months from the effective date of December 30, 2022, whichever occurs first. Repeat inspections of cam assemblies and alternate release cable assemblies must continue at the same intervals until the redesigned cable assemblies are installed within 5500 flight hours or 30 months. Installation of the old cable assembly part number 48503-3 is prohibited from the effective date, and revised maintenance manual tasks must be used for installations.
Summary
Canadian Airworthiness Directive CF-2022-69 addresses landing gear alternate extension system cam assembly failures on De Havilland Aircraft of Canada Limited model DHC-8-401 and DHC-8-402 aeroplanes, serial numbers 4001 and 4003 through 4633. The directive mandates inspections and replacement of specific parts to prevent failure of the main landing gear alternate extension system. It also updates maintenance procedures to detect and correct damage to critical components.
What changed
This new Airworthiness Directive introduces mandatory one-time and repeat inspections of the cam assemblies, spring box assemblies, and alternate release cable assemblies on the main landing gear alternate extension system. It requires replacement of the alternate release cable assembly part number 48503-3 with a redesigned part number 48503-5. Additionally, it prohibits installation of the old cable assembly and mandates use of revised maintenance tasks for installation procedures.
Why it matters
This directive is critical for aviation professionals to mitigate the risk of asymmetric main landing gear configuration during landing caused by alternate extension system failures. Compliance ensures aircraft safety by preventing runway excursions and maintaining airworthiness. Operators, maintenance organizations, and compliance teams must integrate these inspections and part replacements into their maintenance programs to meet regulatory requirements and avoid operational disruptions.
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