Jim,

Hmm. This sounds weird. Is the noise coming from the engine or is the
headset "making" the noise through some electronic feedback in the ANR
circuitry? The latter would be unusual, especially if it happened in
both headsets the same way at the same time.

So you suspect a mic is coming open during take-off? My first thought
would be to adjust the intercom squelch setting, which is sensitive to
background noise and has to be adjusted accordingly. What intercom do
you use? Are you sure the noise is coming through the headset mics? If
so, by simply pulling the mic plugs, you can find out which headset is
the offender.


--
Thomas Borchert (EDDH)