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What is the difference of CAT II and CAT III?
  • A

    Only CAT III requires a radio altimeter.

  • B

    Only CAT II requires no RVR.

  • C

    Only CAT III requires no RVR.

  • D

    Only CAT III allows no DH/A.

The highest accuracy approaches are the CAT III approaches that may provide guidance all the way to the runway with no requirement for decision height (CAT IIIB) nor for runway visual range (CAT IIIC).


Category

Decision Height (DH)

Runway Visual Range (RVR)

CAT I

DH 200 ft

RVR 550 m (helicopters 500 m)

CAT II

DH 100 ft

RVR 300 m

CAT IIIA

DH 100 ft

RVR 200 m

CAT IIIB

no DH

75 m (ICAO SARPS: 50 m)

EASA AIR OPS
Annex I Definitions for terms used in Annexes II to VIII

(14) ‘category II (CAT II) operation’ means a precision instrument approach and landing operation using ILS or MLS with:

(a) DH below 200 ft but not lower than 100 ft; and
(b) RVR of not less than 300 m;

(15) ‘category IIIA (CAT IIIA) operation’ means a precision instrument approach and landing operation using ILS or MLS with:

(a) DH lower than 100 ft; and
(b) RVR not less than 200 m;

(16) ‘category IIIB (CAT IIIB) operation’ means a precision instrument approach and landing operation using ILS or MLS with:

(a) DH lower than 100 ft, or no DH; and
(b) RVR lower than 200 m but not less than 75 m;

Please let us know if you come across this question in your official exam. Considering the current correct option, we believe that the examiner does not take into account CAT IIIC which requires no decision height and no runway visual range.

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This question has appeared on the real examination, you can find the related countries below.

  • Austro Control