Landing Gear — Trailing Arm Assembly Axle Bore Corrosion
- Published
- Effective
- Deadline
- Replaces
- 2019-33
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must inspect for affected trailing arm assemblies within three months of the relevant service bulletin revision date (27 November 2019) or by reviewing maintenance records. Affected parts require initial and follow-up inspections for surface finish discrepancies, rework as needed, and primer and paint replacement within 120 months of service entry. Installation of unapproved trailing arm assemblies is prohibited from 27 September 2019 onward.
Summary
Airworthiness Directive CF-2019-33R1 addresses corrosion issues in the trailing arm assembly axle bore of the main landing gear on Bombardier BD-700-1A10 and BD-700-1A11 aircraft, specifically serial numbers 9001 through 9879, 9998, and 60001 and subsequent. The directive mandates inspections, rework, and paint replacement to prevent potential landing gear collapse caused by corrosion due to improper contaminant removal during manufacturing.
What changed
This revision CF-2019-33R1 extends the compliance time for the initial inspection to ensure sufficient time for completing subsequent inspections. It also clarifies that reviewing aircraft maintenance records is an acceptable method to identify affected trailing arm assemblies. The directive continues to prohibit installation of non-conforming parts unless properly marked.
Why it matters
This directive is critical for operators and maintenance organizations to prevent main landing gear failure due to corrosion, which could lead to gear collapse during operation. Compliance ensures continued airworthiness and safety of affected Bombardier aircraft. It also provides clear guidance on inspection intervals and corrective actions to maintain regulatory compliance and operational safety.
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