Aircraft Operations. Volume II - Construction of Visual and Instrument ...

II-1-3-2 Procedures — Aircraft Operations — Volume II
23/11/06
Note 2.— The dimensions shown are those which encompass current aircraft types. They are chosen to
facilitate OCA/H calculations and promulgation of aircraft category related minima. It is assumed that these
dimensions are not intended to be used for other purposes than the OCA/H calculations in other ICAO
documents. The use of OAS surfaces to calculate OCA/H may result in significant differences between aircraft
categories because of small differences in size. For this reason, it is always preferable to use the Collision Risk
Model (3.4.9) which will allow for more realistic assessment for both height and position of obstacles.
Note 3.— Current Category E aircraft are not normally civil transport aircraft and their dimensions are not
necessarily related to Vat at maximum landing mass. For this reason, they should be treated separately on an
individual basis.
b) Category II/III is flown autocoupled (for Category II flown with flight director, see 3.4.8.7.6).
c) Missed approach climb gradient 2.5 per cent.
d) The approach azimuth deviation information is displayed using sensitivity characteristics in accordance with the
following table (Annex 10, Volume I, Attachment G to Part I, 7.4.1.1).
Approach azimuth antenna
to threshold distance (ATT) Nominal course width
0 – 400 m ± 3.6 degrees
500 – 1 900 m ± 3.0 degrees
2 000 – 4 100 m
(105)
± arctan degrees
ATT
4 200 – 6 300 m ± 1.5 degrees
Note.— The displacement sensitivity characteristics given above for the ATT distances from 2 000 m to
4 100 m are based upon a nominal course width of 210 m at the MLS approach reference datum.
e) Glide path (elevation angle):
1) minimum: 2.5°;
2) optimum: 3.0°; and
3) maximum: 3.5° (3° for Cat II/III operations).
Note.— The glide path angle of the procedure must be greater than or equal to the minimum glide path
(see Annex 10, Part I, 3.11.1 — Definitions).
f) MLS approach reference datum height 15 m (50 ft).
g) All obstacle heights are referenced to threshold elevation.
h) For Cat II and Cat III operations the Annex 14 inner approach, inner transitional and balked landing surfaces
have not been penetrated. Where the Cat II OCA/H is higher than the level of the inner horizontal surface, but
below 60 m, the inner approach and balked landing surfaces should be extended to the Cat II OCA/H level to
accommodate Cat III operations.