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

I-4-3-App B-2 Procedures — Aircraft Operations — Volume II
1.3.2 The IAF is at a distance of less than 40.5 km (21.9 NM) from the VOR. The width of the area on each side of
the nominal track is reduced linearly from 9.3 km (5.0 NM) at the IAF to 3.7 km (2.0 NM) at the VOR (Figure I-4-3-
App B-2).
23/11/06
1.4 NDB cases
1.4.1 The IAF is at a distance of more than 25.5 km (13.8 NM) from the NDB. From a distance of 25.5 km (13.8
NM) from the NDB and up to the NDB the width of the area on each side of the nominal track is reduced linearly from
9.3 km (5.0 NM) to 4.6 km (2.5 NM), the outer boundary of the area converging at an angle of 10.3° with the nominal
track (Figure I-4-3-App B-3).
1.4.2 The IAF is at a distance of less than 25.5 km (13.8 NM) from the NDB. The width of the area on each side of
the nominal track is reduced linearly from 9.3 km (5.0 NM) at the IAF to 4.6 km (2.5 NM) at the NDB (Figure I-4-3-
App B-4).
1.5 RNAV case
1.5.1 Requirements. The RNAV system shall meet the following requirements:
a) the accuracy (including position determination, RNAV computation and CDI centering) shall be better or equal
to 0.4 km (0.2 NM) (2 sigma value);
b) the equipment shall include a system to provide integrity with a maximum alarm limit of 1.9 km (1.0 NM) and a
maximum time to alarm of 10 seconds; and
c) the CDI sensitivity shall be better than or equal to 1.9 km (1.0 NM) (full-scale deflection).
1.5.2 Area. The width of the area on each side of the nominal track is reduced linearly from 9.3 km (5.0 NM) at
the initial approach waypoint (IAF) to 5.6 km (3.0 NM) at the next waypoint (Figure I-4-3-App B-5). If the distance (d)
between the IAF and the next waypoint is less than 6.5 km (3.5 NM), an area width of 5-0.577d shall be used in place
of 5.6 km (3.0 NM) in order to limit the angle of convergence to 30° (Figure I-4-3-App B-6).
1.5.3 Figure I-4-3-App B-7 illustrates the combination of turn protection and area narrowing.
Note.— Reduction of the initial approach segment width should only be considered for GNSS receivers which
provide an input to an integrated navigation system, i.e. FMS/multi-sensor systems.
2. PROTECTION OF A TURN AT THE IF
Where a turn at the IF greater than 10° is specified, the intermediate approach area should be widened on the outer side
of the turn, using the method described in Chapter 6, 6.4.6.3.3 based on a bank angle of 25° (or on that angle giving a
turn rate of 3°/s, whichever is the lesser) and on the maximum initial speed for the aircraft category. Figure
I-4-3-App B-8 shows an example of this additional area to protect the turn.