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

Part I — Section 4, Chapter 3, Appendix C I-4-3-App C-13
c) calculation of the horizontal distance: Ds
Ds is the distance between the VOR/DME facility (S) and the projection of the procedure point on the
horizontal plane passing through S (point A)
(Ds, D and hl in km); or
(Ds and D in NM and hl in thousands of feet)
d) calculation of the limiting outbound distance: DL
2 2
Ds = D − hl
2 2
DS = D − 0.027 hl
DL is the slant range between the VOR/DME facility and the end of the outbound track at the specified altitude
(DL, Ds, ds, r, hl in km); or
(DL, Ds, ds, r in NM and hl in thousands of feet)
2 2 2
DL = (Ds + ds) + 4r + hl
2 2 2
DL = (Ds + ds) + 4r + 0.027 hl
DL is then rounded to the next higher km (or NM), unless the decimal part is less than 0.25 km (or NM) in the
case of a procedure at or below 4 250 m (or 14 000 ft) or 0.5 km (or NM) in the case of a procedure above
4 250 m (or 14 000 ft), in which case it is rounded to the next lower km (or NM);
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
(DLs, 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
3.3.4.1.1.2 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;
23/11/06