Which of the following describes IFR NORDO routing procedures?

The correct answer describes the specific terminology used in Instrument Flight Rules (IFR) routing procedures. In IFR operations, understanding how flight routing is communicated is crucial for safe navigation and coordination with air traffic control (ATC).

The phrase "assigned, vector, expected, filed" is key to the communication protocol used when pilots receive instructions from ATC. Specifically:

• "Assigned" refers to the route or clearance that ATC has specifically given to the pilot for their flight.

• "Vector" indicates that ATC is directing the aircraft along a specific path that may differ from the filed flight plan based on traffic or other operational needs.

• "Expected" signifies the route or procedure that ATC expects to issue to the aircraft later in the flight, which may not be immediately provided at the time of takeoff.

• "Filed" represents the routing that the pilot submitted in their flight plan prior to departure.

Using this terminology helps ensure that both pilots and ATC are on the same page with respect to the routing of the aircraft, thus enhancing overall safety and efficiency in the airspace. Other options might incorporate variations of these terms, but they do not align precisely with standard IFR communication protocols.