How many preset channels can the UHF backup control unit allow for?

The UHF backup control unit allows for 20 preset channels. This capability is crucial for maintaining communication in various operational scenarios, providing pilots with a range of frequencies to select from quickly. The design of having 20 channels enhances flexibility and ensures that they can easily switch to the required communication channel based on mission needs or situations that may arise during flight. The number of preset channels plays a significant role in supporting efficient communication among pilots and ground control, ensuring that they are always prepared to engage or switch communications as necessary.