What method is used to validate the heading indicator during preflight?

What method is used to validate the heading indicator during preflight?

• A. Cross-check with magnetic heading or GPS
• B. Verify altimeter setting
• C. Check fuel quantity
• D. Inspect pitot tube

Answer: (A)

The heading indicator is a gyro-driven instrument that can drift over time, so it must be checked against a reliable reference. During preflight you validate it by cross-checking with a known magnetic reference or a GPS-derived heading. By matching the heading indicator to the magnetic heading shown by the compass (or to the GPS track/heading), you confirm that the gyro is displaying an accurate heading. If the readings differ beyond tolerance, the indicator isn’t trustworthy and should be adjusted or noted. The other checks deal with different systems: altimeter setting affects altitude readings, fuel quantity concerns endurance, and the pitot tube relates to air data like airspeed. None of those verify the accuracy of the heading indicator.

The heading indicator is a gyro-driven instrument that can drift over time, so it must be checked against a reliable reference. During preflight you validate it by cross-checking with a known magnetic reference or a GPS-derived heading. By matching the heading indicator to the magnetic heading shown by the compass (or to the GPS track/heading), you confirm that the gyro is displaying an accurate heading. If the readings differ beyond tolerance, the indicator isn’t trustworthy and should be adjusted or noted.

The other checks deal with different systems: altimeter setting affects altitude readings, fuel quantity concerns endurance, and the pitot tube relates to air data like airspeed. None of those verify the accuracy of the heading indicator.