COM 3 is used for which function?

COM 3 is used for which function?

• A. NAV
• B. HF
• C. ACARS
• D. SELCAL

Answer: (C)

COM 3 is used for ACARS—the Aircraft Communications Addressing and Reporting System. ACARS is a digital data-link that automatically exchanges text messages between the airplane and ground stations, including flight plans, weather updates, position reports, and maintenance messages. This channel is dedicated to data communications, separate from voice or navigation functions. The navigation radios handle VOR/ILS signals, HF provides long-range voice communication, and SELCAL is an alerting system for HF calls, not a data-link channel. So COM 3 being the ACARS channel fits the function described.

COM 3 is used for ACARS—the Aircraft Communications Addressing and Reporting System. ACARS is a digital data-link that automatically exchanges text messages between the airplane and ground stations, including flight plans, weather updates, position reports, and maintenance messages. This channel is dedicated to data communications, separate from voice or navigation functions. The navigation radios handle VOR/ILS signals, HF provides long-range voice communication, and SELCAL is an alerting system for HF calls, not a data-link channel. So COM 3 being the ACARS channel fits the function described.