When should frequency changes not be issued to single-piloted helicopters?

Frequency changes should not be issued to single-piloted helicopters during taxiing, air hovering, and low-level flight because these phases of flight require the pilot's full attention to maintain control of the aircraft and ensure safety.

During taxiing and hovering, the pilot must focus on the immediate environment, which includes managing ground obstacles, other aircraft, and maintaining a stable position. Issues of situational awareness and control become critical at low altitudes and during these operational maneuvers, making it essential for the pilot to minimize distractions. In low-level flight, the pilot is also managing heightened risks related to terrain and obstacles, further necessitating a concentrated effort on flying the aircraft.

In contrast, frequency changes can typically be more easily accommodated during periods of cruising at altitude or as part of strategic flight planning when the pilot has more capacity to manage communication without compromising safety.