flyburg, I see whatcha saying. There's also OCS which has to be complied with or noted otherwise if that's not the case. The purpose of IAP is to position you to able to complete the landing by visual means primarily. It's not like you're required to perform evasive maneuvers for obstacle avoidance after you broke visual. You're entirely correct on the CAT III matter. I did a little digging and found following:
OBSTACLE SURFACES
Obstacle clearance criteria for Category 2 operations are in ICAO PANS-OPS Doc 8168. An Obstacle Free Zone (OFZ) is the airspace below 150 feet above the established airport elevation and along the runway and extended runway centreline, that is required to be kept clear of all objects; except for frangible visual NAVAIDs that need to be located in the OFZ because of their function, in order to provide clearance for aircraft landing or taking off from the runway, and for missed approaches. If the Obstacle Free Zone (OFZ) requirements cannot be fully met, the National Regulatory Authority should be consulted as to the feasibility of specific aeroplane types carrying out Category 2 operations within the obstacle limitations pertaining. This applies particularly if a Category 2 DH exceeds 150ft, which is the top of an OFZ.
The obstacle clearance criteria for Cat 3 operations are satisfied by the provision of an OFZ. Thanx for the info.
