Draft ICAO Circular on NLA.pdf - Airports Council International

<strong>ICAO</strong> Version 4.1 — 15 March 2004
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for code E: 65 m + 4.5 m + 10.5 m = 80 m;
for code F: 80 m + 4.5 m + 13 m = 97.5 m
4.1.6.5 Taxiway/apron taxilane to object separation
4.1.6.5.1 Annex 14, Volume I, paragraph 3.8.7, Table 3-1, column 11 specifies that the minimum
distance between a code F taxiway centre line and an object should be 57.5 m. It may be permissible to
operate with lower separation distances at an existing aerodrome if an aeronautical study indicates that such
lower separation distances would not adversely affect the safety or significantly effect the regularity of
operations of aeroplanes.
4.1.6.5.2 Paragraph 3.10.3 also envisages that the taxiway strip should provide an area clear of objects
which may endanger an aircraft.
4.1.6.5.3 Aerodrome Design Manual, Part 2, paragraphs 1.2.13 to 1.2.18, Table 1-1 and 1-4,
Figure 1-4 states that:
Separation = 1/2 wing span + max lateral deviation + increment
for code E: 1/2 x 65 m + 4.5 m + 10.5 m = 47.5
for code F: 1/2 x 80 m + 4.5 m + 13 m = 57.5 m
4.1.6.6 Aircraft stand taxilane to object separation (including service road)
4.1.6.6.1 Annex 14, Volume I, paragraph 3.8.7, Table 3-1, column 12, specifies a minimum separation
distance between the taxilane centre line and an object to be 50.5 m. Note 4 to this paragraph envisages that
this distance may need to be increased if jet exhaust wake velocity is likely to be hazardous for ground
servicing personnel and equipment.
4.1.6.6.2 Aerodrome Design Manual, Part 2, paragraphs 1.2.13 to 1.2.17, Tables 1-1 and 1-4,
Figure 1-4 indicate that:
Separation = 1/2 wing span + max. lateral deviation + increment
for code E: 1/2 x 65 m + 2.5 m + 7.5 m = 42.5
for code F: 1/2 x 80 m + 2.5 m + 8 m = 50.5 m
See paragraphs 1.2.61 and 1.2.62 of the Aerodrome Design Manual, Part 2.
4.1.6.7 Hazard identification and analysis
4.1.6.7.1 The separation distances during taxiing are intended to limit the risk of collision between
two aeroplanes (taxiway/taxiway separation) and between an aeroplane and an object (taxiway/object,
taxilane/object separations).