Notice Updates Polar Areas of Magnetic Unreliability | Aviation International News

Notice Updates Polar Areas of Magnetic Unreliability

Updated boundaries indicate where magnetic compasses are highly unreliable

By Gordon Gilbert • Contributor - Accidents and Regulations

October 10, 2023

The FAA has published Notice 8900.672, which provides authorized operators with updated and new boundary changes for certain polar areas of magnetic unreliability (AMU). These areas, where magnetic compasses are highly unreliable and unusable, apply to Part 91K and Part 135 operators that hold letters of authorization (LOA) B040 and/or B050.

Guidance for issuing B040 LOA now designates a Northern and Southern AMU. The Northern AMU is the area within 1,000 nm of the Northern magnetic pole, except for airspace over Alaska and its territorial waters. In addition, the FAA designates Canadian northern domestic airspace as part of the Northern AMU. The Southern AMU is the area within 1,000 nm of the southern magnetic pole. Previously, there was no AMU designated for B040 LOA.

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