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unserviceability lights shall be used.
Note.- Unserviceability markers and lights are used for
such purposes as warning pilots of a hole in a taxiway or
apron pavement or outlining a portion ofpavement, such as on
an apron, that is under repair. They are not suitable for use
when a portion of a runway becomes unserviceable, nor on a
taxiway when a majorportion of the width becomes unserviceable.
In such instances, the runway or taxiway is normally
closed.
Location
7.4.2 Unserviceability markers and lights shall be
placed at intervals sufficiently close so as to delineate the
unserviceable area.
Note.- Guidance on the location of unserviceability lights
is given in Attachment A, Section 13.
7.4.3 Unserviceability markers shall consist of conspicuous
upstanding devices such as flags, cones or marker boards.
Characteristics of unserviceabiiity lights
7.4.4 . An unserviceability light shall consist of a red fixed
light. The light shall have an intensity sufficient to ensure
conspicuity considering the intensity of the adjacent lights and
the general level of illumination against which it would
normally be viewed. In no case shall the intensity be less than
10 cd of red light.
Characteristics of unserviceability cones
7.4.5 Recommendation.- An unserviceability cone
should be at least 0.5 m in height and red, orange or yellow
or any one of these colours in combination with white.
Characteristics of unserviceabiiity frags
7.4.6 Recommendation.- An unserviceability flag
should be at least 0.5 m square and red, orange or yellow or
any one of these colours in combination with white.
Characteristics of unserviceability marker boards
7.4.7 Recommendation.- An unserviceability marker
board should be at least 0.5 m in height and 0.9 m in length,
with alternate red and white or orange and white vertical
stripes.
CHAPTER 8. ELECTRICAL SYSTEMS
8.1 Electrical power supply systems
for air navigation facilities
Introductory Note.- The safety of operations at aerodromes
depends on the quality of the supplied power. The total
electrical power supply system may include connections to one
or more external sources of electric power supply, one or
more local generating facilities and to a distribution network
including transformers and switchgear. Many other aerodrome
facilities supplied from the same system need to be
taken into account while planning the electrical power system
at aerodromes.
8.1.1 Adequate primary power supply shall be available
at aerodromes for the safe functioning of air navigation
facilities.
8.1.2 The design and provision of electrical power
systems for aerodrome visual and radio navigation aids shall
be such that an equipment failure will not leave the pilot with
inadequate visual and non-visual guidance or misleading
information.
Note.- The design and installation of the electrical
systems need to take into consideration factors that can lead
to malfunction, such as electromagnetic disturbances, line
losses, power quality, etc. Additional guidance is given in the
Aerodrome Design Manual, Part 5.
8.1.3 Recommendation.- Electric power supply
connections to those facilities for which secondary power is
required should be so arranged that the facilities are
automatically connected to the secondary power supply on
failure of the primary source of power.
8.1.4 Recommendation.- The time interval between
failure of the primary source of power and the complete
restoration of the services required by 8.1.10 should be as
short as practicable, except thatfor visual aicis associated with
non-precision, precision approach or take-off runways the
requirements of Table 8-1 for maximum switch-over times
should apply.
Note.- A definition of switch-over time is given in
Chapter 1.
8.1.5 The provision of a definition of switch-over time
shall not require the replacement of an existing secondary
power supply before 1 January 2010. However, for a
secondary power supply installed after 4 November 1999, the
electric power supply connections to those facilities for which
secondary power is required shall be so arranged that the
facilities are capable of meeting the requirements of Table 8-1
for maximum switch-over times as defined in Chapter 1.
Vuual aids
Application
8.1.6 For a precision approach runway, a secondary
power supply capable of meeting the requirements of
Table 8-1 for the appropriate category of precision approach
runway shall be provided. Electric power supply connections
to those facilities for which secondary power is required shall
　
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