If part of an ATC clearance is unacceptable, what should a pilot do?

When a pilot receives an ATC clearance that contains an unacceptable element, the appropriate action is to refuse the clearance and inform ATC. This ensures that safety is prioritized, as complying with an unclear or inappropriate directive may lead to dangerous situations or violations of regulations.

Clearing up any ambiguity or concerns directly with ATC allows the pilot to obtain a correct and safe clearance that reflects the current operational situation. It exemplifies the principle of open communication in aviation, where both the pilot and air traffic controllers must work together to maintain safety in the airspace.

Attempting to comply with an unacceptable clearance can lead to unintentional violations, while switching frequencies may cause further confusion or a break in communication, and continuing on the original flight path might not align with safety or air traffic management requirements. Thus, refusing the clearance while informing ATC is the safest and most responsible choice.