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

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<strong>II</strong>I-2-4-2 Procedures — <strong>Aircraft</strong> <strong>Operations</strong> — <strong>Volume</strong> <strong>II</strong><br />

the lower altitude in the inner area. Additionally, the straight-in TAA may be divided into radial subsectors (see<br />

Figures <strong>II</strong>I-2-4-3 to <strong>II</strong>I-2-4-5).<br />

4.4.2 Step-down arcs are limited to one per TAA. A step-down arc should be no closer than 19 km (10 NM) from<br />

the fix upon which the arc is centred <strong>and</strong> a minimum <strong>of</strong> 19 km (10 NM) from the 25 NM TAA boundary, in order to<br />

avoid too small a subsector.<br />

4.4.3 The straight-in TAA area may also be divided radially into subsectors. The minimum size <strong>of</strong> any straight-in<br />

TAA subsector that also contains a step-down arc shall be no less than 45 arc degrees. The minimum size <strong>of</strong> any<br />

straight-in TAA subsector that does not contain a step-down arc shall not be less than 30 arc degrees.<br />

4.4.4 Left <strong>and</strong> right TAA base areas may only have step-down arcs, <strong>and</strong> shall not be further divided into radial<br />

subsectors.<br />

4.4.5 The width <strong>of</strong> the buffer area between adjacent step-down arcs <strong>and</strong> adjacent subsectors is 9 km (5 NM).<br />

23/11/06<br />

4.5 PROMULGATION<br />

4.5.1 TAAs shall be depicted on the plan view <strong>of</strong> approach charts by the use <strong>of</strong> “icons” which identify the TAA<br />

reference point (IAF or IF), the radius from the reference point, <strong>and</strong> the bearings <strong>of</strong> the TAA boundaries. The icon for<br />

each TAA area will be located <strong>and</strong> oriented on the plan view with respect to the direction <strong>of</strong> arrival to the approach<br />

procedure, <strong>and</strong> will show all TAA minimum altitudes <strong>and</strong> step-downs arcs for that area.<br />

4.5.2 The IAF for each TAA is identified by the waypoint name to help the pilot orient the icon to the approach<br />

procedure. The IAF name <strong>and</strong> the distance <strong>of</strong> the TAA area boundary from the IAF are included on the outside arc <strong>of</strong><br />

the TAA area icon. TAA icons also identify where necessary the location <strong>of</strong> the intermediate fix by the letters “IF” <strong>and</strong><br />

not the IF waypoint identifier to avoid misidentification <strong>of</strong> the TAA reference point <strong>and</strong> to assist in situational<br />

awareness. (See Figures <strong>II</strong>I-2-4-3, <strong>II</strong>I-2-4-4, <strong>II</strong>I-2-4-5.)

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