You set up near high-voltage lines and a large metal structure and receive compass warnings. What is the best response?

• A.Take off anyway because compass warnings clear with altitude
• B.Move the takeoff location away from the interference sources and recalibrate only as directed by the manufacturer if needed
• C.Hold magnets near the aircraft to counteract the interference

Why

Large metal objects and electrical sources can distort the magnetic field the compass senses. Relocating away from the source addresses the cause, rather than flying with unreliable heading information.

Source: FAA-G-8082-22 Ch. 12 · ACS knowledge area: Maintenance and Preflight Inspection Procedures · From the Maintenance & Preflight Inspection practice bank (MNT-028).

Practice this category as a full test

More Electromagnetic Interference and Compass questions

• During a preflight inspection you find a small nick and a hairline crack near the hub of one propeller. What is the correct action?
• What should a careful inspection of the airframe and arms look for before flight?
• When you rotate a motor by hand during preflight, it feels gritty and makes a scraping sound unlike the other motors. What should you do?
• Under 14 CFR 107.15, when may a remote pilot in command operate a small unmanned aircraft that he or she knows is not in a condition for safe operation?
• How does required maintenance for a small unmanned aircraft differ from that for most manned aircraft?