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

Part I — Section 4, Chapter 3, Appendix C I-4-3-App C-19
DL2
e) calculation of the horizontal limiting outbound distance: DLs
DLs is the distance between the VOR/DME facility and the vertical projection of the end of the outbound track
onto the horizontal plane passing through S
(DL, hl in km); or
(DLs, DL in NM and hl in thousands of feet)
2 2
DLs = DL − hl
2 2
DLs = DL − 0.027 hl
3.3.4.2.1.2 Fix tolerance area and limiting outbound distance
a) Draw from S the procedure radial “RP” and two lines, “RP1” and “RP2”, making an angle α (tolerance for a
homing VOR, Part I, Section 2, Chapter 2, Table I-2-2-1) with RP on each side of it;
b) with a centre on S, draw arcs “Ds” with a radius Ds, “Dl” with a radius Ds + dl, “D2” with a radius Ds – dl,
“DLs”, “DL1” and “DL2” with radii DLs, DLs + d2 and DLs – d2
where dl and d2 are the DME tolerances associated with D and DL:
d1 is 0.46 km (0.25 NM) + 0.125 D; and
d2 is 0.46 km (0.25 NM) + 0.0125 DL; and
c) locate points “A” at the intersection of RP and Ds:
“A1” and “A2” at the intersections of RP1 with D1 and D2; and
“A3” and “A4” at the intersections of RP2 with D1 and D2.
3.3.4.2.1.3 Protection of the outbound turn and outbound leg
a) Place template point “a” on Al, with axis parallel to the inbound track, and draw curve “l” (part of the outline of
the template);
b) place template point “a” on A3, with axis parallel to the inbound track, and draw curve “2” (part of the outline
of the template) and line “3” (protection of the outbound leg in the direction of the non-manoeuvring side); and
c) draw the common tangent to curves “l” and “2” and extend the straight part of curve “l” and the line “3” in the
direction of the outbound end.
3.3.4.2.1.4 Area containing the end of the outbound leg
a) Locate points C1 and C’3 at the intersections of the extensions of curve “l” with the arcs DL1 and DL2. If no
intersection occurs a limiting radial shall be specified (see 3.3.4.3 of this appendix);
b) locate point C2 between C1 and C’3 at a distance (dl + d2 – 1.8) km or (dl + d2 – 1) NM from C’3;
23/11/06