What should be avoided until ice accumulations on the aircraft are removed?

Aerobatics should be avoided until ice accumulations on the aircraft are removed because ice can significantly alter the aerodynamic properties of the aircraft. When ice forms on the wings or control surfaces, it adds weight and changes the shape of the surfaces, leading to a loss of lift and increased drag. This can result in unpredictable handling characteristics, especially during the high-stress maneuvers typical of aerobatic flying.

Aerobatics often require precise control and high performance from the aircraft, which may be compromised by any presence of ice. Therefore, engaging in aerobatics while ice is present could pose serious safety risks, making it crucial to ensure that the aircraft is free of ice before performing such maneuvers.

Other activities, such as instruments checks, flight level adjustments, and navigation exercises, can usually be conducted with appropriate caution, as they typically do not involve the high aerodynamic demands that aerobatics do.