If (s)he's refering to K1B9, Mansfield, Mass., then it does not have an
ILS. Don't know when the beeping was heard, but there are other airports in
the area that do have ILS approaches.

- Steve

"Robert M. Gary" wrote in message
oups.com...
Does your field have an ILS approach for instrument landings? If so its
probably the marker beacons. They can sound like a really nasty alarm