Which term refers to compass correction for disturbances from electrical and metal components in the aircraft?

Which term refers to compass correction for disturbances from electrical and metal components in the aircraft?

• A. Deviation
• B. Cyclic Feathering
• C. Cyclic Pitch Control
• D. Delta Hinge

Answer: (A)

Compass errors caused by disturbances from electrical and metal components inside the aircraft are called deviation. The aircraft’s own magnetic fields from wiring, avionics, and structure skew the Earth’s magnetic field that the compass senses, so pilots must apply a deviation correction to read the true heading. This correction is found on the compass correction card and used for each heading. Variation is a separate concept referring to the difference between true north and magnetic north at a location, not the cockpit-induced error. The other terms are not related to compass corrections: cyclic feathering and cyclic pitch control are rotor/flight control terms, while delta hinge is a rotor mechanism term.

Compass errors caused by disturbances from electrical and metal components inside the aircraft are called deviation. The aircraft’s own magnetic fields from wiring, avionics, and structure skew the Earth’s magnetic field that the compass senses, so pilots must apply a deviation correction to read the true heading. This correction is found on the compass correction card and used for each heading.

Variation is a separate concept referring to the difference between true north and magnetic north at a location, not the cockpit-induced error. The other terms are not related to compass corrections: cyclic feathering and cyclic pitch control are rotor/flight control terms, while delta hinge is a rotor mechanism term.