Wing Structure — Lower Wing Plank — Cracking at Stringer Run-out
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Bombardier CL-600-2B19 aircraft must update their maintenance programs within 30 days of the directive's effective date. Aircraft without the service bulletin BS 601R-57-044 must cease using outdated inspection revisions and adopt the revised inspection task 57-21-112. Aircraft with the service bulletin must incorporate the new limit of validity task 57-21-169 as detailed in the revised maintenance manual RT2B-2269.
Summary
The Canadian Airworthiness Directive CF-2019-21 addresses fatigue cracking detected in the lower wing plank at the stringer run-out area on Bombardier Inc. CL-600-2B19 aircraft, serial number 7003 and later. This directive mandates updated inspection procedures to detect potential cracks in the right lower wing plank to ensure structural integrity. It applies specifically to the wing structure of these Bombardier regional jets.
What changed
CF-2019-21 introduces revised inspection tasks for detecting fatigue cracks in the lower wing plank, expanding the inspection zones and updating the non-destructive testing manual requirements. It prohibits the use of previous inspection revisions and mandates incorporation of a new limit of validity task for aircraft that have incorporated service bulletin BS 601R-57-044. This directive also revises maintenance manuals to include these new inspection requirements.
Why it matters
This directive is critical for operators and maintenance organizations to prevent undetected fatigue cracks that could compromise wing structural integrity. Compliance ensures early detection and correction of potential cracks, thereby maintaining aircraft safety and airworthiness. It also aligns maintenance practices with the latest safety standards mandated by Transport Canada.
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