ANR squeal on descent

"Scott Migaldi" wrote in message
...
Juan Jimenez wrote:
Somebody explain to me why ANR headsets squeal when you are descending
from FL180 and lower in an unpressurized aircraft. Flightcom is modifying
their Denalis to deal with this but they say all ANR's do this.

????

Juan
Never had this problem with my David Clarks or Lightspeeds. Could it be
that you have such a good ear seal that during descent the ear cups are
equalizing via a small amount of air leaking into them causing the squeal?
Have you tried loosening up the HS?

Scott

It's not me, it's a friend who flies Twin Otters out of Las Vegas. I sold
him a Denali ANR I was not using, and I had never flown with it to that high
of an altitude. He reported the problem, we talked to Flightcom, they asked
for it to be sent back and they changed the ANR module with one with an
adjustable sensitivity or something like that. They still don't know what
causes the squealing, though, and the change of modules doesn't always fix
the problem. Weird!

Juan

Juan Jimenez wrote:
Somebody explain to me why ANR headsets squeal when you are descending from
FL180 and lower in an unpressurized aircraft. Flightcom is modifying their
Denalis to deal with this but they say all ANR's do this.

Don't get up to FL180 much, but coming in to 23L at RDU, right next to the radar
antenna, I get a chirp on each revolution of the antenna. Happens on my Bose X
and my Telex ANR.

Dave

I used to have a squeal problem with my DCs. Since I wear glasses, it
was suggested that the seal is compromised and feedback can occur. It's
been a long while since I've flown so I don't recall if that was in fact
the problem.

Juan Jimenez wrote:
Somebody explain to me why ANR headsets squeal when you are descending from
FL180 and lower in an unpressurized aircraft. Flightcom is modifying their
Denalis to deal with this but they say all ANR's do this.

????

Juan

I don't think it is. I asked the buyer and he says he wears his glasses
above the seals.

"Foster" wrote in message
...
I used to have a squeal problem with my DCs. Since I wear glasses, it was
suggested that the seal is compromised and feedback can occur. It's been a
long while since I've flown so I don't recall if that was in fact the
problem.

Juan Jimenez wrote:
Somebody explain to me why ANR headsets squeal when you are descending
from FL180 and lower in an unpressurized aircraft. Flightcom is modifying
their Denalis to deal with this but they say all ANR's do this.

????

Juan