A determination can be made as to whether an aircraft on the ground has an operable receiver, but no transmitter, by asking the pilot to

A determination can be made as to whether an aircraft on the ground has an operable receiver, but no transmitter, by asking the pilot to

• A. Move the rudders
• B. Turn on the transponder
• C. Verify the frequency
• D. Cycle the audio panel

Answer: (A)

Testing whether an aircraft’s radio can receive but cannot transmit is done by asking the pilot to perform an observable action in response to your instruction. Asking the pilot to move the rudders provides a clear, outward signal that the pilot heard the call. If the rudders move as commanded, you’ve confirmed the receiver is operable—the pilot heard you—while lack of a verbal reply suggests the transmitter isn’t functioning. Other options don’t give that immediate, observable indication of the receive path being working; they test different components or require a voice response that wouldn’t occur if the transmitter were inop.

Testing whether an aircraft’s radio can receive but cannot transmit is done by asking the pilot to perform an observable action in response to your instruction. Asking the pilot to move the rudders provides a clear, outward signal that the pilot heard the call. If the rudders move as commanded, you’ve confirmed the receiver is operable—the pilot heard you—while lack of a verbal reply suggests the transmitter isn’t functioning. Other options don’t give that immediate, observable indication of the receive path being working; they test different components or require a voice response that wouldn’t occur if the transmitter were inop.