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

Part I — Section 4, Chapter 3, Appendix C I-4-3-App C-15
b) move the template point “a” along arc DL2 from C3 to C6 (with axis parallel and opposite to the inbound track)
and draw curve “6”;
c) place template point “a” on C6, C4 and eventually on C5 and draw curves “7”, “8” and eventually “9” and their
common tangent; and
d) draw the tangent to curves “8” and “2”.
3.3.4.1.2 Construction of the entry areas
3.3.4.1.2.1 Arrival to a VOR/DME holding pattern may be:
— along the axis of the inbound track;
— along a published track;
— by radar vectoring, when aircraft must be established on prescribed protected flight paths;
and the entry point may be either:
a) the holding fix; or
b) the fix at the end of the outbound leg.
When the entry point is at the holding fix, two cases may be considered:
Case 1.1 — arrival via the VOR radial for the inbound leg;
Case 1.2 — arrival via the DME arc defining the holding fix.
When the entry point is at the fix at the end of the outbound leg, the only case is arrival via the VOR radial passing
through the fix at the end of the outbound leg.
3.3.4.1.2.2 It is also possible to make use of guidance from another radio facility (e.g. NDB); in that case,
protection of the entry should be the subject of a special study based on general criteria.
3.3.4.1.2.3 The radius of a DME arc used as guidance for arrival at a VOR/DME holding should be not less than
18.5 km (10 NM).
3.3.4.1.2.4 The minimum length for the last segment of the arrival track terminating at the entry point is a
function of the angle (θ) between the penultimate segment or radar path and the last segment. The values are shown in
the following table:
θ
0° – 70° 71° – 90° 91° – 105° 106° – 120°
Minimum distance
in km (NM) 7.5 (4) 9.5 (5) 13 (7) 16.5 (9)
23/11/06