von der Seite: http://www.flaps2approach.com/journal/20…ator-korry.html
The Below G/S P-Inhibit korry is a radio altitude alert and annunciates when there is deviation in the glideslope during an ILS approach. If the aircraft deviates more than 1.3 dots below the glideslope, the korry will illuminate amber, followed shortly thereafter by an aural warning ‘glideslope’.

This alerts the flight crew to a deviation in glideslope and a possible fly into terrain situation. The volume and repetition rate of the aural and visual warning will increase as the deviation from glide slope increases.
However, at times the aural warning is not necessary; therefore, a flight crew can silence the aural warning by pressing the korry. This will cancel or inhibit the alert if the aircraft is at or below 1000 feet Radio Altitude, but is above 50 feet Radio Altitude (RA).