How frequently should the heading indicator be reset?

The heading indicator should be reset every 15 minutes to ensure its accuracy and reliability. The heading indicator, often a gyroscopic instrument, can experience precession and drift over time, which affects its ability to provide precise directional information. By resetting the heading indicator at regular intervals—every 15 minutes in this case—pilots can maintain accurate awareness of their aircraft's heading, especially during extended flights or turns where orientation is crucial for navigation.

Depending on the duration of flight and whether the aircraft is experiencing turbulence or varying airflow, it's essential to frequently calibrate this instrument to avoid navigation errors that may arise from inaccurate heading data. This practice helps enhance overall situational awareness and contributes to safer flight operations.