Failure of the Main Landing Gear Stabilizer Braces
- Published
- Effective
- Deadline
- Replaces
- 2009-11R2
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected Bombardier DHC-8-400 series aircraft must perform initial and repetitive non-destructive inspections of the main landing gear forward stabilizer brace according to the specified landing cycle schedules. They must install the elbow restrictor within 2000 flight hours or 12 months from the effective date of Revision 1 of the AD. Reporting inspection findings to Bombardier within 48 hours is mandatory, and compliance with revised inspection intervals after installation is required.
Summary
Airworthiness Directive CF-2009-11R3 addresses the failure of the main landing gear stabilizer braces on Bombardier Inc. DHC-8-400, -401, and -402 aircraft, serial numbers 4001, 4003 and subsequent, equipped with main landing gear forward stabilizer brace part number 46401-7. This directive mandates inspections, corrective actions, and installation of an elbow restrictor to prevent potential collapse of the main landing gear due to fatigue cracks. The directive is issued by Transport Canada under Canadian Aviation Regulation 521.427.
What changed
CF-2009-11R3 clarifies that inspections required by Part IV Paragraph A or B are not necessary if the aircraft was modified and the initial inspection after rework was conducted according to an approved Alternative Means of Compliance (AMOC). It also consolidates previous revisions by providing updated inspection schedules and confirms that installation of the elbow restrictor is the terminating action for repeat inspections.
Why it matters
This directive is critical for aviation professionals to ensure the structural integrity of the main landing gear stabilizer braces, preventing potential gear collapse during operations. Operators and maintenance organizations must comply to maintain airworthiness and safety, avoid unscheduled downtime, and meet regulatory requirements. Understanding the inspection intervals and corrective measures helps in planning maintenance and ensuring continued airworthiness.
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