GACA Aeronautical Information Publication Practice Exam 2026 – Comprehensive All-in-One Guide for Exam Success!

To determine the minimum altitude for using Flight Level Change (FLCH) on final approach, it is essential to consider the operational characteristics and procedural guidelines set by aviation authorities.

The minimum altitude of 1000 Feet Above Field Elevation (AFE) is established for safety reasons. This altitude allows pilots sufficient margin to execute this maneuver while ensuring terrain and obstacle clearance, particularly in the critical phase of approach where altitude management is crucial. At 1000 Feet AFE, pilots can effectively manage the aircraft’s descent rate and speed without compromising control or safety, especially as they prepare for landing.

FLCH is primarily used to adjust the aircraft's speed during descent while maintaining specific altitude constraints. Utilizing it above 1000 Feet AFE offers the crew a broader range of altitude management options while minimizing risks associated with low-level flight and maintaining compliance with standard operating procedures.

In contrast, lower altitudes such as 500 or 800 Feet AFE might not provide a sufficient safety buffer for adequately managing airspeed and descent profiles, making these altitudes unsuitable for the FLCH function during final approach.