The size of the protected airspace of a holding pattern varies according to which two factors?

The correct answer focuses on speed and altitude as the two factors that influence the size of the protected airspace around a holding pattern.

When determining the dimensions of the airspace for holding patterns, both altitude and speed play crucial roles. The altitude affects the vertical separation needed for aircraft, as higher altitudes require larger buffer zones to ensure safety. Similarly, the speed of the aircraft dictates how wide and how long the holding pattern must be. Faster aircraft generally necessitate larger protected airspace to allow for safe turns and maneuverability within the pattern.

Understanding these factors is critical for effective airspace management and maintaining safe separation between aircraft in holding patterns, especially in busy airspace environments.