6. Avionics and Systems
Communications — Quiz
Test your understanding of communications with 5 practice questions.
Practice Questions
Question 1
Consider an aircraft at an altitude of 20{,}000 ft communicating via VHF radio. Using the line-of-sight approximation $R=1.23\sqrt{h}$ (where $R$ in nautical miles and $h$ in feet), what is the approximate maximum communication range? Show your calculation.
Question 2
Which VHF Data Link mode is currently implemented for operational support of Controller–Pilot Data Link Communications (CPDLC)?
Question 3
What is the primary function of the SELCAL system in long-range HF communications?
Question 4
If an ACARS message is 480 bits long, how many seconds are required to transmit it over the VHF subnetwork at 2400 bps?
Question 5
What is the primary function of the communications computer in an aircraft's datalink system?