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

Chapter 3
MLS
3.1 INTRODUCTION
3.1.1 Application
The MLS criteria in this part are based on ILS criteria and are related to the ground and airborne equipment
performance and integrity required to meet the Standards and Recommended Practices described in Annex 10. The
following criteria apply to MLS Category I, II and III procedures based on the zero-degree azimuth and a glide path
(elevation angle) of the MLS ground equipment and are intended for application pending the introduction of specific
MLS criteria to be developed on the basis of further operational experience.
3.1.2 Procedure construction
The procedure from en-route to the precision segment of the MLS approach conforms to the general criteria in as Part I,
Sections 1, 2 and 4. The differences are found in the MLS precision segment which contains the final approach
segment and the initial/intermediate phases of the missed approach segment. The final approach track for the MLS
procedure is always specified and promulgated in degrees magnetic. Figure II-1-3-l (for MLS Category I, II and III)
shows a typical layout where the final approach track is defined by the MLS zero-degree azimuth and is aligned with
the runway extended centre line.
3.1.3 Standard conditions
The following list contains the standard assumptions on which procedures are developed. Provisions are made for
adjustments where appropriate. Adjustments are mandatory when conditions differ adversely from standard conditions
(see 3.4.8.7, “Adjustment of OAS constants”).
a) Maximum aircraft dimensions are assumed to be the following:
Aircraft category Wing span
Vertical distance between the flight
paths of the wheels and the
GP antenna
(m)
H 30 3
A, B 60 6
C, D 65 7
DL 80 8
Note 1.— OCA/H for DL aircraft is published when necessary.
II-1-3-1 23/11/06