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

III-3-7-4 Procedures — Aircraft Operations — Volume II
h) draw the tangent T1 between line (6) and line (2);
i) draw the tangent T2 between line (2) and (6); and
j) locate point E on the template (see Part I, Section 4, Chapter 3, Appendix C, 3.3.2.2.4.7) and use the following
formulas for XE and YE (which are different from those in Part I, Section 4, Chapter 3, Appendix C,
3.3.2.2.4.7):
(See Figures III-3-7-5 a) and III-3-7-5 b).)
23/11/06
90 105
XE = 2r + D + 11v + 11 + + 11 + W'
R R
20 90 15
YE = 11v.cos 20° + r.sin 20° + r + 11 + + + 11+ W'
R R R
7.5.2.3 Step two — Construction of the basic area (one waypoint holding case).
7.5.2.3.1 Holding point tolerance area. Draw around holding point A the RNAV fix tolerance associated with this
point.
7.5.2.3.2 Construction of the basic area. (See Figure III-3-7-6). Move the RNAV template origin “a” around the
RNAV tolerance area of the holding point “A”.
7.5.2.4 Step three—Construction of the entry area (See Figure III-3-7-7). Draw the circle centred on “A” passing
through A1 and A3; apply the same method as explained in Part I, Section 4, Chapter 3, Appendix C, 3.3.3.2.
7.5.3 Two waypoint holding area
The holding area is constructed by applying the techniques of Part II, Section 4, Chapter 1, “Construction of holding
areas” to each waypoint as if it were a holding fix. The techniques of Part II, Section 4, Chapter 1, are used until the
outbound turn from each waypoint is protected. These protection curves are then joined by their common tangents and
the area thus enclosed is the holding area. The protection required for the entry manoeuvre is described by the area
enclosed by wind spirals applied successively to the most penalistic points of the waypoint tolerance area and the
common tangents to those spirals.
7.5.4 Area holding
The holding area shall contain the basic holding protection area rotated about the waypoint fix tolerance area described
in 7.4.3. (See Figures III-3-7-1 c) and III-3-7-3.)
7.6 HOLDING AREA CONSTRUCTION FOR RNP
7.6.1 Parameters that define the maximum RNP holding pattern
The maximum RNP holding pattern is defined by: