What is the immediate course of action if a pilot encounters a discrepancy with a clearance?

If a pilot encounters a discrepancy with a clearance, the immediate course of action should be to advise Air Traffic Control (ATC) as soon as possible. This is crucial because clear communication with ATC helps ensure the safety of the flight and allows for the resolution of any misunderstandings or errors in flight instructions. Timely reporting of any discrepancies enables ATC to provide necessary guidance or corrections, which is essential for maintaining situational awareness and compliance with established protocols.

Resolving the discrepancy swiftly ensures that the aircraft remains coordinated with other traffic and minimizes potential conflicts. It is part of the pilot's responsibilities to maintain open lines of communication with ATC and report any concerns immediately. This proactive approach ultimately enhances the safety of the flight, as any needed adjustments or clarifications can be addressed without unnecessary delay.

The other options, such as delaying in reporting, contacting passengers, or requesting a change in altitude, may not address the issue directly or promptly enough to ensure safety. Delay in reporting can create complications in the management of air traffic and jeopardize the safety of other flights, while contacting passengers would divert attention from the necessary actions required in the cockpit. Requesting a change in altitude might not resolve the underlying discrepancy with the clearance and could lead to further confusion if