Navigation System — Flight Management System, Inertial Reference System and Attitude and Heading Reference System — Outdated Magnetic Variation Tables
- Published
- Effective
- Deadline
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What to do
Within 30 days of the directive's effective date, operators must update the approved Aircraft Flight Manual with the specified revisions for their aircraft model. After updating the AFM, all flight crews must be informed of the changes to the navigation system limits. Compliance with these actions is mandatory before further flight.
Summary
Navigation System — Flight Management System, Inertial Reference System and Attitude and Heading Reference System — Outdated Magnetic Variation Tables is a Canadian Airworthiness Directive (CF-2019-40) issued by Transport Canada. It applies to Bombardier Inc. aircraft models CL-600-2B19, CL-600-2C10, CL-600-2C11, CL-600-2D15, CL-600-2D24, and CL-600-2E25. The directive addresses outdated magnetic variation tables used in navigation systems that may cause inaccurate magnetic heading displays and positioning errors.
What changed
This directive requires updating the approved Aircraft Flight Manual (AFM) to incorporate revised navigation system limits for the Flight Management System (FMS), Inertial Reference System (IRS), and Attitude and Heading Reference System (AHRS). The update corrects the outdated magnetic variation tables to prevent navigation inaccuracies. Operators must apply specific AFM revisions approved by Transport Canada for each affected aircraft model.
Why it matters
Outdated magnetic variation tables can lead to significant errors in heading, track, and bearing calculations, potentially placing the aircraft outside protected obstacle clearance areas during instrument flight procedures. This poses safety risks for flight crews and passengers. Compliance ensures accurate navigation system performance and maintains regulatory adherence for operators and maintenance organizations.
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