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of the taxiway should not be less than those specified in 3.9.3.
Note 1.- An example of widening taxiways to achieve the
wheel clearance specified is illustrated in Figure 3-2.
Guidance on the values of suitable dimensions is given in the
Aerodrome Design Manual, Part 2.
Note 2.- The location of taxiway centre line markings and
lights is specified in 5.2.8.4 and 5.3.16.11.
Note 3.- Compound curves may reduce or eliminate the
need for extra taxiway width.
Junctions and intersections
3.9.6 Recommendation.- To facilitate the movement of
aeroplanes, fillets should be provided at junctions and
intersections of taxiways with runways, aprons and other
taxiways. The design of the fillets should ensure that the
minimum wheel clearances specified in 3.9.3 are maintained
when aeroplanes are manoeuvring through the junctions or
intersections.
Note.- Consideration will have to be given to the
aeroplane datum length when designing fillets. Guidance on
the design offillets and the definition of the term aeroplane
datum length are given in the Aerodrome Design Manual,
Part 2.
Annex I4 -Aerodromes Volume I
The figure shows an example of taxiway widening to achieve
the specified wheel dearances on taxiway curves (see 3.9.5).
Guidance material on suitable dimensions is given in the
Aerodrome Design Manual, Part 2.
Figure 3-2. Taxiway curve
Taxiway minimum separation distances
3.9.7 Recommendation.- The separation divtance
between the centre line of a taxiway and the centre line of a
runway, the centre line of a parallel taxiway or an object
should not be less than the appropriate dimension specijied in
Table 3-1, except that 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 signijicantly
affect the regularity of operations of aeroplanes.
Note 3.- The separation distances of Table 3-1,
column 10, do not necessarily provide the capability of
making a normal turn from one taxiway to another parallel
taxiway. Guidance for this condition is given in the Aerodrome
Design Manual, Part 2.
Note 4.- The separation distance between the centre line
of an aircraft stand taxilane and an object shown in Table 3-1,
column 12, may need to be increased when jet exhaust wake
velocity may cause hazardous conditions for ground servicing.
Note 1.- Guidance on factors which mav be considered in Slopes on taxiways
the aeronautical study is given in the Aerodrome Design
Manual, Part 2.
3.9.8 Longitudinal slopes
Note 2.- ILS and MLS installations may also influence the
location of taxiways due to interferences to ILS and MLS Recommendation.- The longitudinal slope of a taxiway
siqnals by a taxiinz or stopped aircraft. Information on critical should not exceed:
aid sensitive areas surrounding I L S ~ ~ ~ - MinLstaSll ations is - 1.5 per cent where the code letter is C,D , E or F; and
contained in Annex 10. Volume I. Attachments C and G
(respectively). - 3 per cent where the code letter is A or B.
Chapter 3
Table 3-1. Taxiway minimum separation distances
Annex 14 -Aerodromes
Distance between taxiway centre line Taxiway,
and runway centre line (metres) other than
Taxiway aircraft stand Aircraft stand
Instrument runways Non-instnunent runways centre. line taxilane. taxilane
Code
Code number Code number
letter 1 2 3 4 1 2 3 4
to taxiway centre. line centre line
centre line to object to object
(metres) (metres) (metres)
Note I.- The separation distances shown in columns (2) to (9) represent ordinary combinations of runways and taxiways. The
basis for development of these distances is given in the Aerodrome Design Manual, Part 2.
Note 2.- The distances in columns (2) to (9) do not guarantee suficient clearance behind a holding aeroplane to permit the
passing of another aeroplane on a parallel taxiway. See the Aerodrome Design Manual, Part 2.
3.9.9 Longitudinal slope changes
Recommendation.- Where slope changes on a taxiway
cannot be avoided, the transition j?om one slope to another
slope should be accomplished by a curved surface with a rate
of change not exceeding:
- I per cent per 30 m (minimum radius of curvature of
3 000 m) where the code letter is C, D, E or F; and
- I per cent per 25 m (minimum radius of curvature of
2 500 m) where the code letter is A or B.
3.9.10 Sight distance
Recommendation.- Where a change in slope on a taxiway
cannot be avoided, the change should be such that, from
any point:
- 1.5 m above the taxiway, it will be possible to see the
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