What vertical separation is required for aircraft operating above FL290 from active Special Use or ATC Assigned Airspace?

The correct requirement for vertical separation of aircraft operating above Flight Level 290 (FL290) from active Special Use Airspace or ATC Assigned Airspace is indeed 1,000 feet. This regulation is in place to ensure safe operational distances between aircraft to minimize the risk of encounters with potentially hazardous airspace, such as that designated for military operations or other special uses.

At altitudes above FL290, the airspace becomes more congested, and the performance differences between various types of aircraft can be significant. The 1,000 feet of vertical separation provides a buffer that ensures that even with variations in aircraft performance, there will be enough room to maintain safe operation. This regulation is essential in managing air traffic safety, especially in areas that may be designated for specific and sometimes unpredictable activities.

The other options provide different amounts of separation, but the specified 1,000 feet is governed by established aviation regulations designed to accommodate the complexities of airspace management and ensure safety above high altitudes where traffic density can increase.