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5.3.5.33 Each light unit shall be capable of adjustment in
elevation so that the lower limit of the white part of the beam
may be fixed at any desired angle of elevation between 1°30'
and at least 4O30' above the horizontal.
5.3.5.34 The light units shall be so designed that deposits
of condensation, snow, ice, dirt, etc., on optically transmitting
or reflecting surfaces shall interfere to the least possible extent
with the light signals and shall not affect the contrast between
the red and white signals and the elevation of the transition
sector.
Approach slope and elevation setting
of light units
5.3.5.35 The approach slope as defined in Figure 5-19
shall be appropriate for use by the aeroplanes using the
approach.
5.3.5.36 When the runway is equipped with an ILSandor
MLS, the siting and the angle of elevation of the light units
shall be such that the visual approach slope conforms as
closely as possible with the glide path of the ILS andor the
minimum glide path of the MLS, as appropriate.
5.3.5.37 The angle of elevation settings of the light units
in a PAP1 wing bar shall be such that, during an approach, the
pilot of an aeroplane observing a signal of one white and three
reds will clear all objects in the approach area by a safe
protection surface of the PAP1 or APAPI system, but within
the lateral limits of its light beam, is found to extend above the
plane of the obstacle protection surface and an aeronautical
study indicates that the object could adversely affect the safety
of operations. The extent of the restriction shall be such that
the object remains outside the confines of the light beam.
Nore.- See 5.3.5.41 to 5.3.5.45 concerning the related
obstacle protection sudace.
5.3.5.40 Where wing hars are installed on each side of the
runway to provide roll guidance, corresponding units shall be
set at the same angle so that the signals of each wing bar
change symmetrically at the same time.
Obstacle protechson surface
Note.- The following specifications apply to T-VASIS,
AT- VASIS, PAPI and APAPI.
5.3.5.41 An obstacle protection surface shall be established
when it is intended to provide a visual approach slope
indicator system.
5.3.5.42 The characteristics of the obstacle protection
surface, i.e. origin, divergence, length and slope shall correspond
to those specified in the relevant column of Table 5-3
and in Figure 5-20.
5.3.5.43 New objects or extensions of existing objects
shall not be permitted above an obstacle protection surface
except when, in the opinion of the appropriate authority, the
new object or extension would be shielded by an existing
immovable object.
Note.- Circumstances in which the shielding ~rinciple
may reasonably be applied are described in the Airport
Services Manual, P d 6.
5.3.5.44 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 aeroplanes.
margin.
5.3.5.45 Where an aeronautical study indicates that an
5.3.5.38 ne angle of elevation settings of the light units existing object extending above an obstacle protection surface
in an APAPI wing bar shall be such that, during an approach, could adversely affect the safety of operations of aeroplanes
the pilot of an aeroplane observing the lowest onslope signal, one Or more the measures be taken:
i.e. one white and one red, will clear all objects in the
approach area by a safe margin. a) suitably raise the approach slope of the system;
5.3.5.39 The azimuth spread of the light beam shall be b) reduce the azimuth spread of the system so that the object
suitably restricted where an object located outside the obstacle is outside the confines of the beam;
Chapter 5 Annex 14 - Aerodromes
I
I I
PAPI WING BAR THRESHOLD
The height of the pilot's eye above the aircraft's ILS glide pathlMLS antenna varies with the type of
aeroplane and approach attitude. Harmonization of the PAP1 signal and ILS glide path andlor MLS
minimum glide pathto a pointcloser to thethreshold may beachieved by increasingthe on-course sector
from 20'to 30'. The setting anglesfor a 3"gIide slope wouldthen be 2"25', 2'45: 3'15' and 3'35'.
A - 3" PAPI ILLU-
. A
I I
Af'APIwlNGBAR THREsH0t.D
B - 3' APM ILLUSTIWED
Figure 5-19. Light beams and angle of elevation setting of PAP1 and APAPI
Annex 14 -Aerodromes
Table 5-2. Wheel clearance over threshold for PAP1 and APAPl
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