What happens if a PDR is used incorrectly in controlled airspace?

When a Pilot Departure Request (PDR) is used incorrectly in controlled airspace, a potential increase in departure delays can occur as a result of the miscommunication or mismanagement of traffic flows. In controlled airspace, there are strict protocols and procedures to ensure safety, efficiency, and orderly conduct of air traffic. If pilots do not follow PDR procedures correctly, air traffic controllers may need to adjust their instructions or temporarily halt departures to rectify the situation, leading to increased delays.

This option aligns with how air traffic management operates. Enhanced delays could arise from the need to reroute other flights, re-sequence departures, or ensure safety standards are maintained. The need for proper communication and adherence to established protocols is essential to maintain smooth air traffic operations, and any deviation can have immediate cascading effects on the scheduling and timing of flights.

In contrast, the other options either suggest extreme measures that would not typically occur because of an incorrect PDR usage, such as immediate flight plan cancellations or mandatory upgrades to navigation systems, or imply that there would be no impact, which is not the case in controlled environments where procedures must be strictly followed.