Home › Part 107 Practice Tests › Maintenance & Preflight Inspection Questions › Question 39
If a compass calibration is required, where should it be performed?
- A.In an open spot away from large metal objects, vehicles, and other sources of magnetic interference, following the manufacturer's procedure
- B.Directly beside a steel vehicle for convenience
- C.On reinforced concrete with the aircraft touching a metal railing
Correct answer
A. In an open spot away from large metal objects, vehicles, and other sources of magnetic interference, following the manufacturer's procedure
Why
Nearby metal and electrical sources distort the magnetic field during calibration and bake that error into the result. Choosing a clear location is as important as following the calibration steps themselves.
Source: FAA-G-8082-22 Ch. 12 · ACS knowledge area: Maintenance and Preflight Inspection Procedures · From the Maintenance & Preflight Inspection practice bank (MNT-039).