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Aerodrome Frequency Response Unit (AFRU)
An Aerodrome Frequency Response Unit (AFRU) is a device installed at non-controlled aerodromes that provides an automatic response to radio transmissions over two seconds long. It helps improve safety by confirming the operation of the aircraft's transmitter and receiver, and verifying that the correct frequency is selected.
Key Points
- •Provides a voice identification if the frequency has not been used for 5 minutes.
- •Generates a <strong>300 millisecond</strong> tone if the frequency was recently used.
- •Three microphone clicks within 5 seconds triggers a voice identification.
Exam Relevance
Candidates must know how to verify their radio setup using the AFRU when operating at non-controlled aerodromes.
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