What is the procedure for IFR departures at airports with pretaxi clearance programs?

Answer: C — Pilots receive taxi instructions and IFR clearance from ground control prior to taxi.

The procedure for IFR departures at airports with pre-taxi clearance programs allows pilots to receive their taxi instructions and IFR clearance from ground control prior to taxiing. This streamlined process is designed to ensure that flight planning and clearance are handled efficiently, minimizing delays and maintaining an orderly flow of traffic at busy airports. By obtaining both taxi instructions and the IFR clearance in one step before taxiing, pilots can prepare their aircraft and be ready to depart as soon as they have completed the necessary checks. This system enhances safety by ensuring that all relevant information is communicated to the pilot before they begin moving, and it also aids air traffic control in managing departures and coordinating with arriving flights effectively. In contrast, the other options describe procedures that may not align with the intent of pre-taxi clearance programs. For instance, requesting clearance when ready to taxi or only after engine start could lead to confusion and delays, as the intent of these procedures is to have pilots well-informed and prepared before they begin taxiing. Prior requests for clearance more than 10 minutes in advance do not fit with the immediate and efficient communication that pre-taxi clearance programs aim for.