For a successful approach to SFO/ELP, what is the appropriate clearance altitude at the appropriate position?

In the context of approaching San Francisco International Airport (SFO), the appropriate clearance altitude is critical for ensuring that aircraft maintain safe separation from terrain and obstacles while being guided into the terminal airspace. The choice of 1500 AGL (Above Ground Level) is aligned with standard operating procedures that help manage altitude constraints prior to reaching the airport.

At this altitude, an aircraft is typically above the significant terrain and obstacles in the vicinity of the airport, allowing for a safe transition into the final approach corridor. This altitude facilitates adequate reaction time for pilots to manage their descent while also allowing air traffic control to maintain safe separation between aircraft operating in the area.

The reasons for maintaining this specific altitude can include allowing for lateral separation from other aircraft, enabling the proper use of approach aids such as Instrument Landing Systems (ILS), and ensuring that the approach path is clear of any obstructions or populated areas below.

While lower altitudes, such as 500 AGL or 600 AGL, may provide a closer descent to landing, they can pose risks associated with insufficient clearance from terrain and obstacles, as well as potential conflicts with other air traffic. Similarly, 3000 AGL may be unnecessarily high for an approach and could lead to inefficient flight profiles,