Which count represents the maximum number of comsets allowed on the A/C at one time?

• A. 3 comsets
• B. 7 comsets
• C. 12 comsets
• D. 10 comsets

Answer: (D)

The idea here is that there’s a practical limit to how many communications sets an aircraft can have operating at once. Ten comsets is the maximum allowed because it keeps the radio system manageable for the crew and for maintenance, while also limiting power draw, weight, and the potential for interference between radios. With ten available comsets, you can configure multiple channels for essential use—such as ATC, company communications, guard or alternate channels, and standbys—without overloading the cockpit or the aircraft’s electrical system. Going beyond this would raise issues with interference, increased workload, and certification constraints, so ten comsets represents the practical upper limit.