What should pilots apply to prevent creep during engine run-up?

To prevent creep during engine run-up, pilots should apply sufficient brake pressure. During this procedure, the aircraft's engine is operated at high power settings, and without adequate brake pressure, the aircraft may begin to move unintentionally. This creep can lead to unsafe situations, particularly if the aircraft moves unexpectedly while the pilots are focused on engine performance rather than aircraft control.

By applying sufficient brake pressure, pilots can maintain control of the aircraft and ensure it remains stationary during the engine run-up checks. This is crucial for safety, particularly in multi-engine aircraft where asymmetrical thrust could cause the aircraft to pivot or move in unintended ways if not properly restrained. Proper brake application allows pilots to focus on the necessary checks without concerns about the aircraft's movement. Other options, while related to aircraft control, do not specifically address the issue of preventing creep during this phase of operation.