What is the range of N_p to avoid stabilized ground operations?

The range of N_p (propeller speed) that is specified to avoid stabilized ground operations is between 62% and 80%. Operating the propeller within this range during ground operations can prevent unwanted propeller effects, such as excessive thrust or drag, which could lead to loss of control or instability while on the ground.

When the N_p is below 62%, the propeller may not produce sufficient thrust, impacting the aircraft's performance during taxi or takeoff. Conversely, exceeding 80% N_p in ground operations can lead to excessive thrust, compromising safety and stability. Thus, maintaining N_p within the 62% to 80% range is crucial for safe aircraft handling on the ground.