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

Chapter 2
ARRIVAL AND APPROACH PROCEDURES
2.1 GENERAL
2.1.1 Application
2.1.1.1 This chapter describes the arrival, approach and final missed approach criteria for RNAV and RNP
procedures. The criteria for the final approach, initial and intermediate missed approach are specific to the approach
classification (NPA, APV and precision) and are dealt with in separate chapters.
2.1.1.2 The general criteria of Part I and Part III, Sections 1 and 2, as amplified or modified by the criteria in this
chapter, apply to RNAV and RNP approach procedures.
2.1.1.3 No more than nine waypoints shall be employed in an RNAV approach procedure, from the initial
approach point to the waypoint which concludes the missed approach segment.
2.1.2 Secondary areas
The general criteria for secondary areas apply (see Part I, Section 2, Chapter 1, 1.2 and 1.3).
2.1.3 Minimum segment length
Minimum segment length distances are listed in the tables in Section 2, Chapter 1.
2.1.4 Area widths
For the calculations of area widths and the underlying tolerances involved in these calculations, see the paragraph
entitled “XTT, ATT and Area Semi-width” in Section 1 for the appropriate sensor. These are:
a) VOR/DME, Section 1, Chapter 4, 4.5;
b) DME/DME, Section 1, Chapter 3, 3.6;
c) GNSS, Section 1, Chapter 2, 2.5; and
d) for RNAV based on RNP when the promulgated RNP value decreases in a point of a procedure the total area
width as defined in Section 1, Chapter 7, 7.5, “XTT, ATT and area semi-width” decreases from the initial value
to the final value with a convergence angle of 30° each side of the axis.
III-3-2-1 23/11/06