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should generally conform with those of the runway with which
the clearway is associated.
Objects on clearways
Note.- See 9.9 for information regarding siting of
equipment and installations on clearways.
3.6.6 Recommendation.- An object situated on a clearway
which may endanger aeroplanes in the air should be
regarded as an obstacle and should be moved.
Surface of stopways
3.7.4 Recommendation.- The surface of a paved
stopway should be so constructed as to pmvide a good
coefficient of fiction to be compatible with that of the
associated runway when the stopway is wet.
3.7.5 Recommendation.- The fiction characteristics of
an unpaved stopway should not be substantially less than that
of the runway with which the stopway is associated.
3.8 Radio altimeter operating area
General
3.7 Stopways
3.8.1 Recommendation.- A radio altimeter operating
Note.- Z%e inclusion of detailed spec~@cationfso r stop- area should be established in the pre-threshold area of a
ways in this section is not intended to imply that a stopway has precision approach runway.
to be provided. Attachment A, Section 2 provides information
on the use of stopways.
Length of the area
Width of stopways 3.8.2 Recommendation.- A radio altimeter operating
area should extend b e f o ~th e threshold for a distice of at 3.7.1 A stopway shall have the same width as the Nnway with which it is associated. least 300 m.
Slopes on stopways Width of the area
3.7.2 Recommendation.- Slopes and changes in slope 3.8.3 Recommendation.- A mdio altimeter opemting
on a stopway, and the transitionfiom a runway to a stopway, area should extend laterally, on each side of the extended
should comply with the specifications of 3.1.13 to 3.1.19 for centre line of the nmway, to a distance of 60 m, except that,
the runway with which the stopway is associated except that: when special circumstances so warrant, the distance may be
reduced to no less than 30 m ifan aeronautical study indicata
a) the limitation in 3.1.14 of a 0.8 per cent slope for the that such reduction would not a mthe safety of operations of
first and last quarter of the length of a runway need not aircraft.
be applied to the stopway; and
b) at the junction ofthe stopway and runway and along the Longitudfnd slope stopway the mmlUtrmurmat e of slope change may be
010.3 0 p0e0r mc)e fnotr paer r u3n0w may (wmhinerime uthme craoddieu ns uomf bceurr visa t3u roer o4f. atin3g.8 a.4r eaR, escloopmem cehnadnagteios ns.h- oulOd nb ae aravodiidoe da ltoimr ekteeprt otpoe raminimum.
Where slope changes cannot be avoided, the slope
Strength of stopways
3.7.3 Recommendation.- A stopway should be prepared
or conrtructed so as to be capable, in the event of an
abandoned rake-off: of supporting the aeroplane which the
stopway is intended to serve without inducing structural
damage to the aeroplane.
Note.- Attachment A, Section 2 presents guidance relative
to the support capability of a stopway.
changes should be as gmdual as practicable and abrupt
changes or sudden reversals of slopes avoided. The rate of
change between two consecutive slopes should not exceed
2 per cent per 30 m.
Note.- Guidance on radio altimeter operating area is
given in Aftachment A, Section 4.3 and in the Manual of All-
Weather Operations, (Doc 9365). Section 5.2. Guidance on the
use of radio altimeter is given in the PANS-OPS, Volume Il,
Part III, Chapter 21.
2411 1/05
No. 7
3.9 Taxiways Code letter Clearance
Annex 14 -Aerodromes
Note.- Unless otherwise indicated the requirements in this A 1.5 m
section are applicable to all types of taxiways.
B 2.25 m
General
3.9.1 Recommendation.- Taxiways should be provided
topermit the safe and expeditious surface movement of aircraft.
Note.- Guidance on layout of taxiways is given in the
Aerodrome Design Manual, Par? 2.
3.92 Recommendation.- Sufficient entrance and exit
tariways for a runway should be provided fo expedite the
movement of aeroplanes to andfiom the runway and provision
of rapid exit taxiways considered when tq@k volumes are high.
C 3 m if the taxiway is intended to be used
by aeroplanes with a wheel base less than
18 m;
4.5 m if the taxiway is intended to be used
by aeroplanes with a wheel base equal to
or greater than 18 m.
3.9.3 Recommendation.- The design of a taxiway Note 1.- Wheel base means the distance fiom the nose
should be such that, when the cockit of the aeroplane for gear to the geometric centre ofthe main gear:
which the taxiway is intended remains over the taxiway centre
line markings, the clearance distance between the outer main Note 2.- When the code letter is F and the traffic density
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