On Mon, 21 Nov 2005 01:31:40 GMT, Steven P. McNicoll wrote:

"Mike H" wrote in message
. ..

At many airports, such as my home field, KRYY, the glideslope is
"unusable" when the tower is closed... Perhaps that is some additional
'protection'....


At many airports? I can't think of any other. Any idea why the GS is
unusable when the tower is closed?

Steve,

I've seen it myself. One that comes to mind is HKS.

On the approach plate, says when tower closed, GS unusable.

Delta airspace that underlies JAN Charlie airspace....

Allen