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specific operational procedures is required.
If the taxiways are not provided with proper guidance or if the airport / local authority does not feel
comfortable with the use of 23 meter wide taxiways, the use of “follow me” guidance can be a solution.
No specific alternative measures, operational procedures and operating restrictions are proposed
for operations of an A380 on a 23 meters wide straight taxiway. Use of “follow me” guidance can be
a solution if proper guidance is not available or the airport / local authority does not feel comfortable
with the use of 23 meters wide taxiways.
Airport/local authority should maintain markings, lights and pavement surfaces (e.g. snow removal)
to provide good quality taxi guidance.
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7
Width of curved taxiway
To facilitate the movement of an A380 on curved taxiways and on junctions / intersections of taxiways with
runways, aprons and other taxiways, fillets should be provided. The design of the fillet should ensure that a
minimum wheel to edge clearance is maintained, based on Cockpit over Centre Line (COCL) steering
technique. ICAO requires a minimum wheel to edge clearance of 4.5 meters for curved taxiway segments
Also the AACG recommendations mentions a 4.5 meters wheel to edge clearance for curved taxiways,
however in some states the use of smaller wheel to edge clearances (i.e. 2.5 meters) for the design of
taxiway fillets is under certain conditions accepted.
If the required wheel to edge clearance cannot be guaranteed when using COCL steering technique,
judgemental oversteering is required. The use of judgemental oversteering must be published in the
appropriate aeronautical publications. If even judgemental oversteering is not sufficient or if the airport / local
authority does not feel comfortable with this, additional markings (for over steering guidance) could be a
practical solution
Proposed alternative measures, operational procedures and operating restrictions for airports that
cannot comply with ICAO requirements or AACG recommendations related to width of curved
taxiway.
 Reduced wheel to edge clearance
 Use of judgemental oversteering
 Additional markings for over steering guidance.
 Publication in the appropriate aeronautical documentation is required.
Taxiway shoulder width
Both ICAO Annex 14 and the AACG Common Agreement Document recommend a 60 meters wide strip to
be protected against shoulder erosion and engine ingestion risk. The shoulders could be build up of a paved,
a stabilized or a natural surface (experienced at CDG for many years). The A380 engine ground clearance is
a factor. The inner engines are 0.5m higher and the outer engines 1.2m higher than those of the 747-400,
which would decrease the ingestion and jet blast risksTaxiing on two engines is not unusual but is mainly a
practice after landing. Taxiing on two engines before take-off requires the outboard engines to be started up
near or even at the runway, which can result in a long blockage of the runway and consequently disturbing
other traffic flow.
Depending on the shoulder width and quality and given the location of A380 inboard and outboard engines,
a specific procedure could be used (preferential use of some of the engines)
Proposed alternative measures, operational procedures and operating restrictions for airports that
can-not comply with ICAO requirements or AACG recommendations related to shoulder width.

Depending on the shoulder width and quality and given the location of A380 inboard and outboard
engines, a specific procedure could be used (preferential use of some of the engines)
 Publication in the appropriate aeronautical documentation is required.
3.3 Runway - taxiway separations
Separation between runway and parallel taxiway is given by ICAO as 115 meters for a non instrument
runway and 190 meters for an instrument runway. Both are applicable to code F. For code E these
separation distances are respectively 107.5 and 182.5 meters.
Although AACG agreed with the 115 meters some members have the opinion that the 115 meters for noninstrument
runways is at the very lower boundary of what could be acceptable. On the other hand AACG
also have the opinion that the 190 meters for instrument runways may be conservative4. This subject is also
on the agenda of the ICAO Aerodromes Panel.
4 Some states are studying the issue of allowing lower separations than those of ICAO, code F. The ECAC NLA
website is intended to reference those studies when available.
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The original FAA regulation specifies a 600ft (182m) separation in the US for FAA ADG VI category
(equivalent to code F). The FAA has produced the draft Advisory Circular 150/5300-13 Change 10
　
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