ICAO distinguishes approaches operations based on DH between 'Type A' (DH >= 250 ft) and 'Type B' (DH < 250 ft), which are further divided into subcategories. From the Annex 6 — Operation of Aircraft Part I:
a) Type A: a minimum descent height or decision height at or above 75 m (250 ft); and
b) Type B: a decision height below 75 m (250 ft). Type B instrument approach operations are categorized as:
- Category I (CAT I): a decision height not lower than 60 m (200 ft) and with either a visibility not less than 800 m or a runway visual range not less than 550 m;
- Category II (CAT II): a decision height lower than 60 m (200 ft) but not lower than 30 m (100 ft) and a runway visual range not less than 300 m;
- Category IIIA (CAT IIIA): a decision height lower than 30 m (100 ft) or no decision height and a runway visual range not less than 175 m;
- Category IIIB (CAT IIIB): a decision height lower than 15 m (50 ft) or no decision height and a runway visual range less than 175 m but not less than 50 m; and
- Category IIIC (CAT IIIC): no decision height and no runway visual range limitations.
Instrument approach procedures are further classified as follows:
Non-precision approach (NPA) procedure. An instrument approach procedure designed for 2D instrument approach operations Type A.
Approach procedure with vertical guidance (APV). A performance-based navigation (PBN) instrument approach procedure designed for 3D instrument approach operations Type A.
Precision approach (PA) procedure. An instrument approach procedure based on navigation systems (ILS, MLS, GLS and SBAS CAT I) designed for 3D instrument approach operations Type A or B.
If I understand correctly, EASA would like to implement similar concept (as stated in 'Notice of Proposed Amendment 2018-06(C)'). On page 51, there is a summary table with classification of approaches:
- From the table above, how can Category I/II/III approach be 'Type A' approach (green rows)? I thought that from the definition, only 'Type B' approaches have subcategories.
- What kind of approach would be LIRN ILS Z RWY 06 (see the chart below)? What kind of planning minima should I use?