Which of the following components does the RMU not display?

The RMU, or Radio Management Unit, is designed to manage and display various communication and navigation data for the aircraft. Its primary functions include managing UHF radios, ATC transponder settings, and communication channels.

The RMU displays UHF communications, allowing the pilot to adjust and monitor radio frequencies essential for communication with air traffic control and other aircraft. It also provides vital information related to the ATC transponder, including its status and settings, which are crucial for transponder codes and altitude reporting. Additionally, the RMU allows pilots to manage communication channels, ensuring that they can switch between various frequencies as needed.

However, Distance Measuring Equipment (DME) data is not typically displayed on the RMU. Instead, DME information is usually shown on the relevant navigation instruments, such as the Primary Flight Display (PFD) or Multi-Function Display (MFD). The DME measures the distance between the aircraft and a ground station, which is primarily a navigational aid rather than a communication function, making it outside the purview of the RMU's display capabilities.