What is the minimum obstacle clearance required above the highest obstacle within 2 NM of the aircraft?

The minimum obstacle clearance required above the highest obstacle within 2 nautical miles of an aircraft is 500 feet. This requirement is established to ensure that aircraft maintain a safe altitude while navigating, particularly in areas where there may be terrain or man-made structures that could pose a risk to safe flight operations.

The 500-foot clearance provides a buffer that helps to account for variations in terrain and any uncertainties in navigation systems. Maintaining this height helps to reduce the likelihood of an encounter with obstacles, which is crucial for flight safety, especially during critical phases such as departure and approach.

Obstacles can include natural features like hills or mountains, as well as buildings and towers, so this standard is important in both urban and rural areas. Ensuring pilots adhere to this clearance requirement plays a vital role in maintaining safe operating environments in aviation.