cat2 & 3 glide path angle
hello 682 amsl,
performance criteria for ils cat2 & cat3 are contained in icao document annex 10 & ecac document n° 17.
a summary of these requirements is as follows:
ils system is approved : beam bends within limits.
glide path angle between 2.5 & 3.25 degrees.
satisfactory power & transmission back-ups, with correct switch over time to standby system.
automatic signal-in-space monitoring.
the ils reference datum height is at least 49ft.
rwy width min. 45m & satisfactory length.
approach terrain profile checked & satisfactory.
in order to prevent electromagnetic interferences, establish ils critical area's etc... . ( cat2/3 holding positions, eg.)