What is the typical altitude range for base key during an approach?

The typical altitude range for base key during an approach is indeed 600-800 feet Above Ground Level (AGL). This altitude range is crucial because it allows pilots to establish a stable descent and prepare for landing while ensuring they are at a safe altitude to maneuver and make necessary adjustments.

During the approach phase, particularly in terminal airspace, staying within this altitude range helps pilots maintain visual contact with the runway and surrounding terrain while adequately configuring the aircraft for landing. It also provides sufficient height to manage any go-around procedures if required, ensuring safety and compliance with standard operating procedures.

Other altitude ranges would either be too low, making it difficult to maneuver effectively and increasing the risk of obstacles, or too high, which would delay the approach and might lead to complications in the landing sequence.