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

Part I — Section 4, Chapter 3, Appendix C I-4-3-App C-5
3.2.3.2 Influence of the flight technical tolerances
a) On the nominal outbound turn, locate points “dl” and “d2” after 75 and 85 degrees of turn from “b”.
b) From “dl” and “d2”, draw the tangents to the outbound turn and locate points “el” and “e2” on these tangents
(Table III-C-3, line 11).
c) With a centre on “f2” at a distance r from “e2” on the perpendicular line to d2e2, draw the inbound turn at “e2”.
Locate points “g”, “h”, “i” and “j” after 45, 90, 135 and 180 degrees of turn from “e2”.
d) With a centre on “fl”, draw the inbound turn beginning at “el” and locate points “k”, “l” and “m” after 180, 225
and 270 degrees of turn from “el”.
3.2.3.3 Influence of the wind
a) The wind effect is calculated for each point by multiplying the wind speed w by the flying time from the point
“a”, beginning of the turn.
b) Draw arcs with centres “e2”, “g”, “h”, “i”, “j”, “k”, “l” and “m” and radii We2, Wg, Wh, Wi, Wj, Wk and Wl
(Table I-4-3-App C-3, lines 12 to 19).
3.2.3.4 Drawing of the outline of the template. The outline of the template is composed of:
a) the spiral envelope of the arcs centred on “e2”, “g”, “h”, “i” and “j”;
b) the spiral envelope of the arcs centred on “k”, “l” and “m”;
c) the common tangent to the spirals a) and b);
d) the tangent passing through “a” to the spiral a); and
e) the tangent passing through “a” to the spiral b).
3.2.4 Drawing of the protection area of the procedure turn
3.2.4 (Reference Diagram I-4-3-App C-5)
3.2.4.1 Tolerance area of the beginning of the outbound turn
3.2.4.1.1 From the facility, point 0, draw the radial of the procedure and its two protection lines. These lines make
an angle of 6.9° if the facility is NDB, 5.2° if the facility is a VOR, or 2.4° if the facility is a localizer, on each side of
the radial.
3.2.4.1.2 Locate point A on the nominal beginning of the outbound turn.
3.2.4.1.3 According to the type of facility at 0 and eventually at A or 0, draw the tolerance area of point A Al A2
A3 A4 as described on the Figures I-4-3-App C-1 to I-4-3-App C-5.
23/11/06