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5.3.5.4 Recommendation.- A visual approach slope
indicator should be located adjacent to the nominal aiming
point and aligned in azimuth with the preferred approach
direction.
5.3.5.5 The light unit(s) shall be frangible and mounted as
low as possible.
5.3.5.6 The signal format of the HAP1 shall include four
discrete signal sectors, providing an "above slope", an "on
slope", a "slightly below" and a "below slope" signal.
5.3.5.7 The signal format of the HAP1 shall be as shown
in Figure 5-12, Illustrations A and B.
Note.- Care is required in the design of the unit to
minimize spurious signals between the signal sectors and at
the azimuth coverage limits.
5.3.5.8 The signal repetition rate of the flashing sector of
the HAP1 shall be at least 2 Hz.
5.3.5.9 Recommendation.- The on-to-off ratio of
pulsing signals of the HAPI should be 1 to 1 and the
modulation depth should be at least 80 per cent.
Chapter 5 Amex 14 - Aerodromes
5.3.5.10 The angular size of the "on-slope" sector of the
HAPI shall be 45 minutes.
5.3.5.16 A suitable intensity control shall be provided so
as to allow adjustment to meet the prevailing conditions and to
avoid dazzling the pilot during approach and landing.
5.3.5.1 1 The angular size of the "slightly below" sector of
the HAP1 shall be 15 minutes.
Approach slope and elevation settiltg
Light distribution
5.3.5.12 Recommendation.- The light intensity
distribution of the HAP1 in red and green colours should be as
shown in Figure 5-9, Illustration 4.
Note.- A larger azimuth coverage can be obtained by
installing the HAP1 system on a turntable.
5.3.5.13 Colour transition of the HAP1 in the vertical
plane shall be such as to appear to an observer at a distance of
not less than 300 m to occur within a vertical angle of not
more than three minutes.
5.3.5.14 The transmission factor of a red or green filter
shall be not less than 15 per cent at the maximum intensity
setting.
5.3.5.15 At full intensity the red light of the HAPI shall
have a Y-coordinate not exceeding 0.320 and the green light
shall be within the boundaries specified in Annex 14,
Volume 1, Appendix 1, 2.1.3.
5.3.5.17 A HAPI system shall be capable of adjustment in
elevation at any desired angle between 1 degree and
12 degrees above the horizontal with an accuracy of
+5 minutes of arc.
5.3.5.18 The angle of elevation setting of HAP1 shall be
such that during an approach, the pilot of a helicopter
observing the upper boundary of the "below slope" signal will
clear all objects in the approach area by a safe margin.
Chamcteristics of lhe tight unit
5.3.5.19 The system shall be so designed that:
a) in the event the vertical misalignment of a unit exceeds * 0.5" (f 30 minutes), the system will switch off automatically;
and
b) if the flashing mechanism fails, no light wili be emitted
in the failed flashing sector(s).
Table 5-1. Dimensions and slopes of the obstacle protection surface
SURFACE AND
DIMENSIONS
Length of inner edge
Distance from end of FAT0
Divergence
Total length
Slope
a. As indicated in Annex 14, Volume I, Figure 5-13.
b. The angle of the upper boundary of the "below slope" signal.
NON-PRECISION FAT0
Width of safety area
60 m
15%
2 500 m
A* - 0.57'
Ab - 0.65'
Aa -0.9'
NON-INSTRUMENT FAT0
Width of safety area
3 m minimum
10%
2 500 rn
PAPI
HAPI
APAPl
Aa - 0.57'
Ab - 0.65'
Aa - 0.9'
Sector Format
Above Flashing
green
On slope Green
Slightly Red
below
Below Flashing
red
Illustration A Illustration B
v
A , A
A ---- L -- -
Obstacle protection surface
(Dimensions as in Table 5-1)
Approach surface inner edge ,
I
I
I
I
I
I
I \sQ" '"*aGe
/
obSrncw qT7*\e 5'' / \S\OP~
Downwind edge ' IyAppr0ach surface inner eage
Section A-A
I
Figure 5-13. Obstacle protection surface
for visual approach slope indicator systems
Chapter 5 Annex 14 - Aerodromes
5.3.5.20 The light unit of the HAP1 shall be so designed d) suitably displace the final approach and take-off area; and
that deposits of condensation, ice, dirt, etc. on optically
transmitting or reflecting surfaces will interfere to the least e) install a visual alignment guidance system specified in
possible extent with the light signal and will not cause 5.3.4.
spurious or false signals to be generated.
　
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