What should pilots do upon receiving a "clearance void" message?

• A. Immediately change their flight path
• B. Return to their last known position and await further instructions
• C. Proceed to their destination without delay
• D. Contact ATC for clarification

Answer: (B)

Receiving a "clearance void" message indicates that the prior clearance issued to the pilot is no longer valid. In such situations, the appropriate action for pilots is to return to their last known position and await further instructions from air traffic control (ATC). This ensures that pilots can maintain safe operations and receive updated guidance regarding their flight plan or any additional instructions necessary for their safe departure.

Returning to the last known position allows the pilots to reassess their situation based on the current air traffic conditions and ensure coordination with ATC. It also helps to prevent conflicts with other aircraft in the vicinity or miscommunications that can arise from misunderstandings of the clearance void message. Therefore, awaiting further instructions is crucial for maintaining safety and adhering to ATC protocols.