What is the standard glide slope set at for an ILS approach?

The standard glide slope for an Instrument Landing System (ILS) approach is set at 3 degrees. This angle is crucial for ensuring a safe and efficient descent path to the runway. The glide slope helps pilots maintain the correct descent rate during the final approach phase of landing, allowing them to reach the runway threshold at the appropriate altitude.

A 3-degree glide slope translates to a descent rate of approximately 318 feet per nautical mile, which balances the need for a manageable descent speed with the ability to maintain visual and instrument references as the aircraft approaches the runway. This standardization also helps in training and operational consistency across different airports and aircraft types.

Other angles, such as 2 degrees, 4 degrees, and 5 degrees, are not standard for ILS approaches. While specific systems or situations may use different glide slopes, especially in non-standard approaches or for specific runways, the 3-degree glide slope is the most common and widely accepted standard in aviation.