Heading Indicator

A Heading Indicator (HI) is a flight instrument that displays the aircraft's heading with respect to magnetic north. It is a gyroscopic instrument that uses the principle of rigidity in space to maintain a constant indication of heading. The HI is not affected by the aircraft's attitude or the forces of acceleration, making it a reliable source of heading information. However, it is subject to drift over time due to gyroscopic precession and must be periodically realigned with a magnetic compass. The HI is a crucial instrument for maintaining directional control and navigating in instrument meteorological conditions (IMC).
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