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Guest Ohio330

ILS CAT II/III

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Guest Ohio330

I understand what ILS is, but what is the difference between that and CAT II and CAT III ILS?

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Guest s_L_Y_F_a

the difference lies in the decision height minumum and the RVR (runway visual range). While ILS cat II provides a minimum decision height of not less than 100 feet abouve TDZ and a RVR not less than 1200 feet, ILS catIII provides an approach without a DH while the RVR of a catIII approach is split in 3 subcategories (catIIIa RVR=700feet, cat IIIb RVR=150 feet and cat IIIc RVR=0 feet).So if your arrival airport for example has reported a RVR of 200 you would fly an ILS cat IIIb approach.

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Guest Ohio330

Thanks for the reply

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