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

I-4-3-App C-10 Procedures — Aircraft Operations — Volume II
3.3.2.2.4.7 Point “E”. This point is used to determine the omnidirectional entry area in the direction of the C and
D axis. It is located by its coordinates XE and YE from the outline of the template:
a) draw a line perpendicular to the inbound track at a distance XE (Table I-4-3-App C-4, line 32) from the extreme
position of the outline of the template in the direction of the C axis (common tangent to the circles centred on
“k” and “l”);
b) draw a line parallel to the inbound track at a distance YE (Table I-4-3-App C-4, line 33) from the extreme
position of the outline of the template in the direction of the D axis (circle centred on “n4”); and
c) locate point “E” at the intersection of these two lines.
Explanation:
XE is the greatest displacement along the C axis of an aeroplane making an entry procedure. This occurs for a sector 3
entry at an angle of 90° with the procedure axis and a wind along the C axis (see Figure I-4-3-App C-10).
The maximum displacement along the C axis due to wind effect occurs at point Emax, after that portion of turn
corresponding to the drift angle. For simplicity this angle has a value of 15° in the formula.
23/11/06
XE = 2r + (t + 15)v + (11 + 90/R + t + 15 + 105/R)w’
YE is the greatest displacement along the D axis of an aeroplane making an entry procedure. This occurs for a sector 1
entry at an angle of 70° with the procedure axis and a wind along the D axis (see Figure I-4-3-App C-11).
The maximum displacement along the D axis due to wind effect occurs at point Emax, after that portion of turn
corresponding to the drift angle. For simplicity, this angle has a value of 15° in the formula.
YE = 11v cos 20° + r sin 20° + r + (t + 15) v tan 5° + (11 + 20/R + 90/R + t + 15 + 15/R)w’
3.3.3 Second step: construction of the basic area and the associated omnidirectional entry area
3.3.3 overhead a VOR or NDB or at the intersection of VOR radials
3.3.3.1 Construction of the basic area (Reference Diagram I-4-3-App C-9)
3.3.3.1.1 Procedure fix tolerance area
3.3.3.1.1.1 Procedure overhead a VOR
a) Locate point “A” on the VOR; and
b) draw around “A” the position fix tolerance area of the VOR given by the template (area Vl V2 V3 V4) and
locate points “Al”, “A2”, “A3” and “A4” on the four corners of this area.