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adjacent to another unserviceable light, except in a barrette or
a crossbar where two adjacent unserviceable lights may be
permitted.
Note.- With respect to barrettes, crossbars and runway
edge lights, lights are considered to be adjacent $ located
consecutively and:
- laterally: in the same barrette or crossbar; or
-longitudinally: in the same row of edge lights or
barrettes.
10.4.8 The system of preventive maintenance employed
for a stop bar provided at a runway-holding position used in
conjunction with a runway intended for operations in runway
visual range conditions less than a value of 350 m shall have
the following objectives:
a) no more than two lights will remain unserviceable; and
b) two adjacent lights will not remain unserviceable unless
the light spacing is significantly less than that specified.
10.4.9 The system of preventive maintenance employed
for a taxiway intended for use in runway visual range conditions
less than a value of 350 m shall have as its objective that
no two adjacent taxiway centre line lights be unserviceable.
10.4.10 The system of preventive maintenance employed
for a precision approach runway category I shall have as its
objective that, during any period of category I operations, all
approach and runway lights are serviceable, and that in any
event at least 85 per cent of the lights are serviceable in each
of the following:
a) precision approach category I lighting system;
b) runway threshold lights;
c) runway edge lights; and
d) runway end lights.
In order to provide continuity of guidance an unserviceable
light shall not be permitted adjacent to another unserviceable
light unless the light spacing is significantly less than that
specified.
Note.- In barrettes and crossbars, guidance is not lost by
having two adjacent unserviceable lights.
10.4.11 The system of preventive maintenance employed
for a runway meant for take-off in runway visual range
conditions less than a value of 550 m shall have as its objective
that, during any period of operations, all runway lights are
serviceable and that in any event:
a) at least 95 per cent of the lights are serviceable in the
runway centre line lights (where provided) and in the .
runway edge lights; and
b) at least 75 per cent of the lights are serviceable in the
runway end lights.
In order to provide continuity of guidance, an unserviceable
light shall not be permitted adjacent to another unserviceable
light.
10.4.12 The system of preventive maintenance employed
for a runway meant for take-off in runway visual range conditions
of a value of 550 m or greater shall have as its objective
that, during any period of operations, all runway lights are
serviceable and that, in any event, at least 85 per cent of the
Annex 14 -Aerodromes Volume I
lights are serviceable in the runway edge lights and runway 10.4.13 Recommendation.- During low visibility
end lights. In order to provide continuity of guidance, an procedures the appropriate authority should restrict
unserviceable light shall not be permitted adjacent to another construction or maintenance activities in the proximity of
unserviceable light. aerodrome electrical systems.
APPENDIX 1. COLOURS FOR AERONAUTICAL GROUND LIGHTSj
MARKINGS, SIGNS AND PANELS
1. General
Introductory Note.- The following specifications define the
chromaticity limits of colours to be used for aeronautical
ground lights, markings, signs and panels. The specifications
are in accord with the 1983 specz3cations of the International
Commission on Illumination (CIE).
It is not possible to establish speczjkations for colours such
that there is no possibility of confusion. For reasonably certain
recognition, it is important that the eye illumination be
well above the threshold of perception, that the colour not be
greatly modified by selective atmospheric attenuations and
that the observer's colour vision be adequate. There is also a
risk of confusion of colour at an extremely high level of eye
illumination such as may be obtained from a high-intensity
source at very close range. Experience indicates that satisfactory
recognition can be achieved ifdue attention is given to
these factors.
The chromaticities are expressed in terms of the standard
obseker and coordinate system adopted by the International
Commission on Illumination (CIE) at its Eighth Session at
Cam bridge, England, in 193 1. *
2. Colours for aeronautical ground lights
2.1 Chromaticities
2.1.1 The chromaticities of aeronautical ground lights
shall be within the following boundaries:
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