Which order should be followed for lost communications regarding course?

The correct sequence for lost communications is based on standard procedures established by the FAA to ensure that pilots maintain safety and can effectively navigate when communication is lost.

The first step is to follow any last assigned route and altitude given by Air Traffic Control (ATC). This ensures the pilot remains on the path that was specifically instructed before the communication was lost. Next, if there was no last assignment to follow, the pilot would then proceed to the vectored route, which refers to directions or headings provided by ATC to guide the aircraft. Following that, if neither of the previous routes applies, the pilot should expect the last instruction that was given by ATC, which may not have been specifically assigned at the time of the communication failure. Finally, if all else fails, the pilot should revert to the filed flight plan, representing the original route intended for the flight.

Thus, the order of procedures establishes a hierarchy of priorities that assists pilots in safely maintaining their flight operations when unexpected situations arise. This structured approach helps to minimize confusion and enhances safety during critical phases of flight when communication failures may occur.