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

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I-4-8-2 Procedures — <strong>Aircraft</strong> <strong>Operations</strong> — <strong>Volume</strong> <strong>II</strong><br />

23/11/06<br />

8.4 COMBINING SECTORS FOR ADJACENT FACILITIES<br />

8.4.1 Where more than one facility provides instrument approaches to an aerodrome, <strong>and</strong> several minimum sector<br />

altitude diagrams are involved, individual diagrams shall be produced <strong>and</strong> minimum sector altitudes calculated.<br />

8.4.2 If such facilities are located less than 9 km (5 NM) apart, the minimum sector altitude for any given sector<br />

should be the highest <strong>of</strong> all altitudes calculated for that specific sector for every facility serving the aerodrome.<br />

8.5 SECTORS CENTERED ON A VOR/DME OR NDB/DME<br />

8.5.1 In sectors centred on a VOR/DME or NDB/DME, it is possible to define an additional boundary (DME arc)<br />

within a sector, dividing the sector into two subsectors with the lower MSA in the inner area.<br />

8.5.2 The DME arc radius (R) used should be between 19 <strong>and</strong> 28 km (10 <strong>and</strong> 15 NM) in order to avoid the use <strong>of</strong><br />

a subsector <strong>of</strong> too small a size. The width <strong>of</strong> the buffer area between the subsectors remains 9 km (5 NM) (see<br />

Figure I-4-8-2).

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