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lights.
Application
5.3.4.1 Recommendation.- A visual alignment
guidance system should be provided to serve the approach to
a heliport where one or more of the following conditions exist
especially at night:
a) obstacle clearance, noise abatement or trafic control
procedures require a particular direction to be flown;
b) the environment of the heliport provides few visual
surface cues; and
c) it is physically impracticable to install an approach
lighting system.
Location
5.3.4.2 The visual alignment guidance system shall be
located such that a helicopter is guided along the prescribed
track towards the final approach and take-off area.
5.3.4.3 Recommendation.- The system should be
located at the downwind edge of thefinal approach and takeoff
area and aligned along the preferred approach direction.
Annex 14 -Aerodromes Volume II
Chapter 5 Annex 14 - Aerodromes
5.3.5.20 The light unit of the HAPI shall be so designed
that deposits of condensation, ice, dirt, etc. on optically
transmitting or reflecting surfaces will interfere to the least
possible extent with the light signal and will not cause
spurious or false signals to be generated.
5.3.5.2 1 Recommendation.- A HAP1 system intended
for installation on a floating helideck should afford a
stabilization of the beam to an accuracy o f f 1/4 degree within:
k3-degree pitch and roll movement of the heliport.
Obstacle protection surface
d) suitably displace the final approach and take-off area; and
e) install a visual alignment guidance system specified in
5.3.4.
Note.- Guidance on this issue is contained in the
Heliport Manual (Doc 9261).
5.3.6 Final approach and take-off area lights
Application
5.3.6.1 Where a final approach and take-off area is
Note.- The following specifications apply to PAPI, APAPI
and HAPI.
established at a surface level heliport on ground intended for
use at night, final approach and take-off area lights shall be
provided-except that-they may be omitted where the final
5.3.5.22 An ' obstacle protection surface shall be approach and take-off area and the touchdown and lift-off area
established when it is intended to provide a visual approach are nearly coincidental or the extent of the final approach and
slope indicator system. take-off area is self-evident.
5.3.5.23 The characteristics of the obstacle protection
surface, i.e. origin, divergence, length and slope shall
correspond to those specified in the relevant column of Location
Table 5-1 and in Figure 5-13.
5.3.6.2 Final approach and take-off area lights shall be
placed along the edgks of the final approach and take-off area.
5.3.5.24 New objects or extensions of existing objects The lights shall be uniformly spaced as follows:
shall not be permitted above an obstacle protection surface
except when,'in the opinion of the appropiate authority, the a) for an area in the form of a square or rectangle, at
new object or extension would be shielded by an existing intervals of not more than 50 m with a minimum of four
immovable object. lights on each side including a light at each comer; and
Note.- Circumstances in which the shielding principle b) for any other shaped area, including a circular area, at
may reasonably be applied are described in the Airport intervals of not more than 5 m with a minimum of ten
Services Manual, Part 6, (Doc 9137).
lights.
5.3.5.25 Existing objects above an obstacle protection
surface shall be removed except when, in the opinion of the
appropriate authority, the object is shielded by an existing
immovable object, or after aeronautical study it is determined
that the object would not adversely affect the safety of
operations of helicopters.
5.3.5.26 Where an aeronautical study indicates that an
existing object extending above an obstacle protection surface
could adversely affect the safety of operations of helicopters
one or more of the following measures shall be taken:
a) suitably raise the approach slope of the system;
b) reduce the azimuth spread of the system so that the object
is outside the confines of the beam;
c) displace the axis of the system and its associated obstacle
protection surface by no more than 5 degrees;
Characteristics
5.3.6.3 Final approach and take-off area lights shall be
fixed omnidirectional Lights showing white. Where the
intensity of the lights is to be varied the lights shall show
variable white.
5.3.6.4 Recommendation.- The light distribution of
f i ~alp proach and take-off area lights should be as shown in
Figure 5-9, Illustration 5.
5.3.6.5 Recommendation.- The lights should not
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