What is the standard descent path of an ILS approach?

The standard descent path of an ILS (Instrument Landing System) approach is typically set at a 3-degree glide slope. This angle is established to provide a safe and efficient descent profile for aircraft as they approach the runway for landing. A 3-degree glide slope translates to a descent distance of approximately 300 feet for every nautical mile traveled horizontally towards the runway. This angle is widely recognized and is utilized to optimize the approach and ensure that the aircraft maintains a stable descent rate, allowing pilots to manage their speed and configuration effectively during the landing phase.

Using a 3-degree glide slope allows for a balance between safety, performance, and comfort for passengers. It helps ensure adequate terrain clearance during the approach while also providing a clear path for air traffic controllers to manage traffic in the airspace.

Other angles, such as 1 degree, 2 degrees, or 4 degrees, would not conform to the established standards used in aviation for ILS procedures. A flatter glide slope like 1 degree would lead to extended approach profiles that may complicate traffic management, while a steeper glide slope like 4 degrees could increase the risk of an unstable approach and require more aggressive management of aircraft speed and configuration, which may not be practical or safe in