What is the required descent rate for the final approach phase for ILS RWY 25L?

The required descent rate for the final approach phase for an ILS (Instrument Landing System) approach, such as for RWY 25L, is typically standardized to ensure a safe and efficient landing process under instrument flight rules. A descent rate of 800 feet per minute is common for final approaches, particularly in conditions where the aircraft needs to approach with a stable and controlled rate that aligns with standard operating procedures.

This descent rate allows for adequate time to stabilize the aircraft's approach, which is vital in maintaining the required glide path. The goal is to maintain precision in vertical guidance, as provided by the ILS, which assists in ensuring that the aircraft remains on the correct glide slope, typically at a three-degree angle of descent. This aids in meeting the necessary altitudes and airspeed for a safe landing while accommodating air traffic flow and maintaining safety margins.

A descent rate higher than 800 feet per minute, such as 1000 or 1200 feet per minute, might result in a faster approach that can lead to difficulties in managing the descent and providing adequate time to configure the aircraft for landing. Thus, the choice of 800 feet per minute is most aligned with industry norms for a safe and efficient final approach.