Navigation - Inertial Reference System (IRS) / Flight Management System (FMS) - Wrong Magnetic Heading Displayed due to Outdated Magnetic Variation (MagVar) Tables
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected Bombardier CL-600-2B16 (604 Variant) aircraft must update their AFMs with the specified revisions within 60 days of the directive's effective date, 24 July 2020. After updating the manuals, all flight crews should be briefed on the new limitations and changes to navigation system performance.
Summary
Canadian Airworthiness Directive CF-2020-24 addresses navigation system issues in Bombardier Inc. CL-600-2B16 (604 Variant) aircraft, specifically serial numbers 5301 through 5665 and 5701 through 5988. The directive targets incorrect magnetic heading displays caused by outdated Magnetic Variation (MagVar) tables in the Inertial Reference System (IRS) and Flight Management System (FMS).
What changed
CF-2020-24 mandates updating the applicable Airplane Flight Manuals (AFMs) to incorporate revised limitations for the FMS and IRS navigation systems. This update corrects the outdated MagVar tables to ensure accurate magnetic heading information is displayed. Additionally, flight crews must be informed of these changes following the AFM revisions.
Why it matters
Accurate magnetic heading information is critical for safe navigation and compliance with instrument flight procedures. Outdated MagVar tables can lead to misleading heading displays, potentially placing the aircraft outside protected terrain and obstacle clearance zones. Operators and maintenance teams must address this to maintain flight safety and regulatory compliance.
More for Bombardier CL-600 (Challenger)
All 47- EASA AD CF-2026-41Time Limits/Maintenance Checks – Airworthiness Limitations – AmendmentAug 24, 2026
- EASA AD CF-2025-51R1Flight Controls — Uncommanded and Unarrested Flap MovementDec 2, 2025
- EASA AD CF-2025-36Fuselage, Stabilizers, Wings, Exhaust SystemJul 9, 2025
- EASA AD CF-2025-06Auxiliary Power Unit (APU) — APU Muffler Drainage Blockage Causing Fuel Leakage AccumulationJan 27, 2025
- EASA AD CF-2025-05Landing Gear — Uncommanded Steering
Get the next one by email
New ADs and bulletins for Bombardier CL-600 (Challenger) and CL-600-2B16, summarized like this page, every Monday.