What is that sound that starts when MAIN PWR switch is turned on in the F-16? Its sorta like a fast ticking sound. Why is it there, what makes it, when does it stop? And is it also there when only putting switch to BATT?

You can hear it here:

  • 1
    $\begingroup$ Sounds like the vibrator in an altimeter, but I'm not an F-16 pilot, so I'll leave this guess as a comment rather than an answer. $\endgroup$
    – Ralph J
    Apr 20, 2020 at 20:27


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