How many preset channels can the UHF backup control unit store?

The UHF backup control unit is designed to store a specific number of preset channels for efficient communication handling in various scenarios. In this case, the correct answer indicates that the unit can store 20 preset channels. This capacity allows for sufficient flexibility and operational efficiency, enabling users to quickly switch between predetermined communication frequencies during flight, which is crucial for maintaining contact with air traffic control or other aircraft.

This capability is particularly important when primary communication systems fail or need to be supplemented, ensuring pilots remain connected without having to manually tune to frequencies each time. Understanding the storage capacity of the UHF backup control unit enhances situational awareness and ensures pilots can effectively manage communications.