ILS – Instrument Landing System Approach Minima for different categories of approaches are as follows:
|Category I||not lower than 60m (200 ft)||not less than 550m (visibility) and 800m (RVR)|
|Category II||lower than 60m (200 ft) but not lower than 30m (100 ft)||RVR not less than 300m|
|Category III – A||lower than 30m (100 ft) or no decision height||RVR not less than 175m|
|Category III – B||lower than 15m (50 ft) or no decision height||RVR less than 175 m but not less than 50m|
|Category III – C||no decision height limitations||no RVR limitations|
Mid zone and Roll-out zone RVR requirements for different category of approaches:
Touch-down zone RVR needs to be reported for Cat I operations, touch-down and mid zone RVR for Cat II operations, touch-down, mid and roll-out zone RVR for Cat III operations.
Touch-down zone is always the controlling however if any other RVR is reported and is relevant it also becomes controlling.
|Type of operation||RVR|
|Touch-down zone||Mid zone||Roll-out zone|
|CAT I||550 m||125 m||125 m|
|CAT II||300 m||125 m||125 m|
|CAT III A||175 m||125 m||125 m|
|CAT III B||75/50 m||75/50 m||75/50 m|