What are the two interphone modes available?

The two interphone modes available in the T-6 intercom system are referred to as hot and cold. In the hot mode, the intercom is active and allows for communication between crew members without needing to press a button, making it ideal for situations where quick communication is necessary. This mode is particularly useful during critical phases of flight where constant communication may be required.

In contrast, the cold mode usually requires pressing a button or switch to talk, which can help minimize background noise and distractions, allowing for more controlled communication. This distinction between hot and cold modes allows for flexibility depending on the operational needs during flight.