7754 Vol 1 Flyleaf - ICAO Public Maps

AOP III-5
the operators:
- apply selective taxi routes where feasible:
-remove objects where feasible;
-reduce size of aircraft stands where feasible;
-implement reduced separation distances.
Note.—Although these options may have a degrading
effect on either the provision of suitable stands or on the
ground movement capacity/efficiency of the aerodrome,
they should however be given particular attention so as to
permit B747-400 operations.
37. Where the minimum separation/clearance
distances as specified in Annex 14, Volume I, Table 3-1
cannot be provided by the existing layout of an aerodrome,
States may introduce lower separation standards provided
that an aeronautical study indicates that such lower
separation distances do not adversely affect the safety or
significantly affect the regularity of operations of
aeroplanes. Experience in some States with operation of
B747-400 has shown that it may be permissible, if specific
measures have been implemented to reduce separation
distances on taxiways, apron taxiways and aircraft stand
taxilanes to the dimensions specified in Attachment G to
Part III — AOP of the EUR FASID.
38. The provision of unambiguous and conspicuous
taxi guidance to flight crews under all operational
conditions prevailing at the aerodrome by appropriate
means (e.g. visual aids, marshaller, etc.) is an essential
prerequisite for operations conducted with lower separation
distances. Equally important is the provision of good
taxiway surface friction conditions at all times to ensure
proper braking and nosewheel steering capability of
aeroplanes.
B747-400 Operations - Reduced separation distances on
aircraft stand taxilanes
43. On aircraft stand taxilanes, where reduced
separation distances exist, proper guidance such as centre
line lights or equivalent guidance (e.g. marshaller, etc.)
should be provided for night, winter or low visibility
operations.
44. All objects not providing the minimum
separation/clearance distance as specified in Annex 14,
should be properly marked or lighted (Annex 14, Chapter
6 refers).
45. Apron service roads should be properly marked
with service road boundary lines and apron safety lines
(Annex 14, Chapter 5 refers).
39. Regarding turns, reduced separations/clearance
distances are based on the assumption that the cockpit
should remain above the taxiway centre line
marking/lighting as accurately as possible and at taxi speeds
commensurate with actual operating conditions prevailing,
except that for aircraft stand taxilanes a different technique,
as specified in the AIP, may apply.
B747-400 Operations - Reduced separation distances on
taxiways/apron taxiways
40. Whenever minimum separation distances
between the centre lines of parallel taxiways or between
taxiway/apron taxiway centre line and object, as specified
in Annex 14, are reduced in accordance with Attachment
G to Part III — AOP of the EUR FASID, taxiway centre
line lighting should be provided for night, winter or low
visibility operations.
41. On parallel taxiways, the separation distances
between the centre lines should be not less than 76 m
(Attachment G to Part III — AOP of the EUR FASID
refers).
42. In straight portions of a taxiway or apron taxiway
the separation distance between the centre line and an
object such as a building or a parked aircraft should be not
less than 41.5 m and in taxiway or apron taxiway curves,
the separation distances between the centre line and an
object should be not less than 45.5 m (Attachment G to Part
III — AOP of the EUR FASID refers).
46. Along straight portions of an aircraft stand
taxilane, the separation distance between the centre line and
an object such as a parked aircraft or a building should be
not less than 40 m, whereas the wing tip clearance of an
aircraft turning from a taxilane into an aircraft stand should
not be less than 7.5 m as recommended in Annex 14,
Chapter 3,
Note.— The separation distance between the taxilane
centre line and an object or edge of a service road may
further be reduced to not less than 37.5 m provided that the
object (e.g. blast fence) does not exceed a height of 3 m
above the relative taxilane centre line.
47. In curves of aircraft stand taxilanes the separation
distances should not be less than 42.5 m, as specified in