What is NOT a requirement for VFR aircraft entering Class D airspace?

To understand why flying below 18,000 feet ASL is not a requirement for VFR aircraft entering Class D airspace, it's important to clarify what Class D airspace entails. Class D airspace is generally found around airports with an operational control tower and extends from the surface up to a designated altitude, which can vary.

In this airspace, VFR (Visual Flight Rules) pilots must establish two-way radio communication with the Air Traffic Control (ATC) tower, ensuring that they can receive instructions and information pertinent to their flight within that airspace. Additionally, while having a transponder is not mandated generally for VFR flights, it is typically required in controlled airspace to improve safety and efficiency in managing air traffic.

The requirement specifically mentions that pilots must fly VFR within the limitations set by the FAA, which can include maintaining visual flight rules, but does not inherently limit them to below 18,000 feet ASL specifically in Class D. Class D airspace typically does not extend to 18,000 feet, but that altitude is a significant boundary for airspace classifications (specifically transitioning into Class E). Therefore, while pilots must adhere to the principles of VFR, they are not required to stay below 18