Depends how 'steep' is defined. London City ILS glidepaths are both 5.5 deg and many other UK airfields have ILS glidepaths in excess of 3 deg (Farnborough is 3.5 deg both ends); ICAO definition is 'in excess of 3.5 deg' I think, at least they say a 'normal' GP is from 2.5 to 3.5.
You can only do Cat 11 or Cat 111 approaches with 3 deg.
The flight crews should be aware if the GP angle is anything other than 3 deg, so it shouldn't affect them, after all, the autopilot will fly the GP whatever angle it is.
Last edited by chevvron; 16th Dec 2013 at 19:53.