What receiver does tuning to the desired localizer frequency automatically tune to the proper frequency?

The glide slope receiver is designed to work in conjunction with the localizer receiver as part of the Instrument Landing System (ILS). When the aircraft is tuned to the localizer frequency, the glide slope receiver automatically tunes to the associated glide slope frequency for the same runway. This streamlined process ensures that pilots receive the correct lateral and vertical guidance necessary for precision approaches.

In this context, the glide slope receiver's ability to synchronize with the localizer frequency is crucial for ensuring safe and effective landings, particularly in adverse weather conditions. This automatic adjustment minimizes pilot workload and enhances the reliability of the ILS approach, making it an essential component of modern avionics systems. Other options, such as the marker beacon receiver, weather radar receiver, and flight data recorder, do not perform this automatic tuning function and serve entirely different purposes within the aircraft's avionics suite.