Safety Information BulletinEASA SIB CASA-2024-03

Inboard Flap Spigot Tube and Mid and Outboard Flap Corrosion

Published: May 13, 2024

Bombardier BD-700

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What to do

Owners and operators should amend their Transport Canada-approved maintenance schedules to include the specified TLMC Part 3 Chapter 5 tasks and affiliated AMM tasks addressing corrosion of the inboard flap spigot tubes and the internal structure of the mid and outboard flaps. These tasks must be accomplished within the thresholds and intervals identified in the alert. Later revisions of these tasks approved by Transport Canada are also acceptable for compliance.

Summary

Transport Canada Civil Aviation Safety Alert CASA 2024-03 addresses corrosion issues affecting the inboard flap spigot tubes and the internal structure of the mid and outboard flaps on Bombardier Inc. aeroplanes models BD-700-1A10 and BD-700-1A11. The alert highlights the need for inspections and corrective actions to mitigate corrosion risks in these specific aircraft components. It recommends incorporating related Maintenance Review Board Report and Aircraft Maintenance Manual tasks into the approved maintenance schedule.

What changed

CASA 2024-03 introduces requirements to inspect the inboard flap spigot tubes for corrosion, which were not previously mandated until the update of the affiliated AMM Task 57-51-00-290-801 in July 2023. It also emphasizes the need for inspections of the internal structure of the mid and outboard flaps, supplementing existing exterior inspections that were insufficient to detect internal corrosion. The alert consolidates multiple service bulletins and mandates incorporation of specific TLMC and AMM tasks into the maintenance schedule.

Why it matters

This alert is critical for aviation professionals as it identifies corrosion risks that could compromise the structural integrity of key flap components on Bombardier BD-700-1A10 and BD-700-1A11 aircraft. Operators, maintainers, and compliance teams must address these corrosion issues to ensure continued airworthiness and safety. Failure to detect and correct corrosion could lead to increased maintenance costs, potential flight safety hazards, and regulatory non-compliance.

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