Two-way ground-to-air checks of emergency frequencies are performed during low-activity periods at least once every ___.

• A. Day
• B. Week
• C. Shift
• D. Month

Answer: (B)

Regular testing of emergency ground-to-air frequencies ensures pilots and controllers can rely on a clear, continuous emergency path when needed. Doing two-way checks during times of low activity lets testers verify both transmitting and receiving functions and practice the proper call-and-response procedure without competing with busy traffic. The weekly interval strikes a practical balance: it keeps the system checked often enough to catch developing faults, while not imposing the burden of daily or per-shift testing. Daily checks would be excessive for routine operations, and monthly checks could let issues go unaddressed for too long. Hence, these tests are performed at least once a week.