EASA SIB CASA-2020-01: Bombardier CL-600-2B19 Aeroplanes - Inspection of the Translating Cowl Doors

What to do

Operators and maintainers of Bombardier CL-600-2B19 aircraft should review Bombardier's All Operator Message No. 1667 and implement the latest maintenance instructions for inspecting the translating cowl doors. They must follow the Aircraft Maintenance Manual Revision 58 or later for the specified inspection tasks 78-30-00-220-801 and/or 71-11-01-210-801. For further information, stakeholders can contact Transport Canada’s Continuing Airworthiness office.

Summary

The document titled Bombardier CL-600-2B19 Aeroplanes - Inspection of the Translating Cowl Doors is a Civil Aviation Safety Alert issued by Transport Canada addressing safety concerns for Bombardier CL-600-2B19 (CRJ 100 & 440 series) aircraft. It highlights issues with the translating cowl doors becoming dislodged during flight, causing damage to the airplane fuselage. The alert emphasizes the importance of following the latest Aircraft Maintenance Manual inspection procedures for these components.

What changed

This safety alert introduces a revised Aircraft Maintenance Manual task that includes an additional detailed inspection of the translating cowl closing latches and fittings. This change was made after investigations revealed that improper maintenance and undetected fatigue cracks in latch fittings contributed to the dislodgement of the cowl doors. The revision aims to prevent future occurrences by ensuring more thorough inspections.

Why it matters

This alert is critical for operators, maintainers, and maintenance organizations as it addresses a safety risk that can lead to in-flight damage and potential hazards. Ensuring compliance with the updated inspection tasks helps maintain aircraft structural integrity and flight safety. It also assists maintenance teams in identifying previously undetectable fatigue cracks, reducing the risk of door detachment during operation.