Which aspect is crucial for avoiding ground resonance?

A controlled landing sequence is crucial for avoiding ground resonance because it directly influences the dynamics of landing the aircraft, particularly helicopters. Ground resonance occurs when the rotor system's vibrations interact with the landing gear, often leading to catastrophic failure if not properly managed. By ensuring a controlled and smooth landing, the pilot can reduce sudden impacts and vibrations that can trigger these resonance effects.

The processes involved in a controlled landing, such as maintaining appropriate descent rates and managing skids or wheels' contact with the terrain, are essential in dissipating energy gradually, rather than allowing abrupt or uneven contact that could initiate ground resonance. This careful management helps maintain stability and control during the critical phase of landing, thereby preventing the conditions that lead to ground resonance.

While adequate RPM management, even weight distribution on skids, and correct fuel load balancing are all important factors in flight safety and aircraft performance, they do not directly mitigate the risks associated with ground resonance in the same way that a controlled landing sequence does.