Height-Range Indicator

A Height-Range Indicator (HRI) is a device used in aviation to provide pilots with information about their aircraft's altitude above the ground. It is typically found in helicopters and is used to assist in safe and accurate landing operations.

The HRI consists of a display panel that shows the aircraft's height above the ground in feet or meters. It uses various sensors, such as radar altimeters or laser rangefinders, to measure the distance between the aircraft and the ground.

The HRI provides real-time information to the pilot, allowing them to maintain a safe altitude during takeoff, landing, and low-level flight operations. It helps pilots avoid obstacles and terrain features, especially in poor visibility conditions.

The display on the HRI may include additional features, such as warning indicators for minimum safe altitude or proximity to the ground. Some advanced HRIs also incorporate terrain mapping and obstacle avoidance capabilities.

Overall, the Height-Range Indicator is an essential tool for helicopter pilots, providing them with crucial information to ensure safe and precise flying operations.