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undershoot. Beyond the stopway and clearway, it is not so
necessary for the lights to be mounted close to the ground and
therefore undulations in the ground contours can be compensated
for by mounting the lights on poles of appropriate height.
1 1.2.9 It is desirable that the lights be mounted so that, as
far as possible, no object within a distance of 60 m on each
side of the centre line protrudes through the plane of the
approach lighting system. Where a tall object exists within
60 m of the centre line and within 1 350 m from the threshold
for a precision approach lighting system, or 900 m for a simple
approach lighting system, it may be advisable to install the
lights so that the plane of the outer half of the pattern clears
the top of the object.
1 1.2.10 In order to avoid giving a misleading impression
of the plane of the ground, the lights should not be mounted
below a gradient of 1 in 66 downwards from the threshold to
a point 300 m out, and below a gradient of 1 in 40 beyond the
300 m point. For a precision approach category 11 and 111
lighting system, more stringent criteria may be necessary, e.g.
negative slopes not permitted within 450 m of the threshold.
1 1.2.1 1 Centre line. The gradients of 'the 'centre line in
any section (including a stopway or clearway) should be as
small as practicable, and the changes in gradients should be as
few and small as'can be arranged and should not exceed 1 in
60. Experience has shown that as one proceeds outwards from
the runway, rising gradients in any section of up to 1 in 66,
and falling gradients of down to 1 in 40, are acceptable.
11.2.12 Crossbars. The crossbar lights should be so
arranged as to lie m a straight line passing through the associated
centre line lights, and wherever possible this line should
be horizontal. It is permissible, however, to mount the lights
m a transverse gradient not more than 1 in 80, if this enables
crossbar lights within a stopway or clearway to be mounted
nearer to the ground on sites where there is a cross-fall.
1 1.3 Clearance of obstacles
11.3.1 An area, hereinafter referred to as the light plane,
has been established for obstacle clearance purposes, and all
lights of the system are in this plane. This plane is rectangular
in shape and symmetrically located about the approach
lighting system's centre line. It starts at the threshold and
extends 60 m beyond the approach end of the system, and is
120 m wide.
11.3.2 No objects are permitted to exist within the
boundaries of the light plane which are higher than the light
plane except as designated herein. All roads and highways are
considered as obstacles extending 4.8 m above the crown of
the road, except aerodrome service roads where all vehicular
traffic is under control of the aerodrome authorities and coordinated
with the aerodrome traffic control tower. Railroads,
regardless of the amount of traffic, are considered as obstacles
extending 5.4 m above the top of the rails.
25llll04 ATT A-10
At&zchment A Annex 14 - Aerodromes
R, = 30.9 m R1 = 32.7 m RI = 36.6 m
Nominal glide path angle 3"
99% probability SECTION A-A SECTION 0-B SECTION C-C
Legend -- - - For Category l operation
For Category II operation
SSSK For Category Ill operation
Figure A-4. Fiight path envelopes to be used tbr lighting design
for category I, I1 and I11 operations
ATT A-11
Annex 14 - Aerodromes Volume Z
Figure A-5. Simple approach lighting systems
ATT A-12
L I
I CENTRE LINE
I
I
L
L
I
I
I
THRESHOLD
I
I
I
I
THRESHOLD -
a.
.I ..
I D
C
E
0
CU w
xpL'T;:;4 18 m, 30 m
1
1
E
0
1 w CU
CROSSBAR
04- LENGTH
10.5 m
4
E
0
0
rn
T 4 v17? I-il 4 m
(3 m mnm)
A -SINGLE SOURCE 8.-BARRETTE
A
E
0 I "
A
4
4
4
4
A
E
0 w
4 300 m b
E
0 25 Y) 75 1W 125 150m
LONG1NI)INUSULE
A-DISTANCE COOED CENTRE LINE
I+ 800 m
300 rn
300 m CR161bar
Squsnced flashing lights
30 centre line bsrrene. at 30 m mtervsi8
. i l h , . ~ h ~ l d ilghb
B - BARRETTE CENTRE LINE
Fig- A-6. Rssirlon appraoch cBtegw 1 lighnng n/stmu
ATT A-13 25/11/04
I PATTERN SLOPED DOWN TOAVOID WLES
A-RISING GROUND
LIGHTS SETAT MUIMUM
LOWERLIMIT FOR LIGHTS
I IN 66FRMI THRESHOLDTO3Ww OUT
l IN 10 FROM 300 m MITT0900 m OUT
HORIZONTAL B - FALLING GROUND
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