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the top of the beams of successive fly-up light units shall
decrease by 5' of arc in angle of elevation at each successive
unit away from the wing bar. The cut-in angle of the bottom
of the beam of the fly-down light units shall increase by 7'
of arc at each successive unit away from the wing bar (see
Figure 5-1 7).
5.3.5.21 The elevation setting of the top of the red light
beams of the wing bar and fly-up light units shall be such that,
during an approach, the pilot of an aeroplane to whom the
wing bar and three fly-up light units are visible would clear all
objects in the approach area by a safe margin if any such light
did not appear red.
5.3.5.22 The azimuth spread of the light beam shall be
suitably restricted where an object located outside the obstacle
protection surface of the 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.
Chapter 5 Annex 14 - Aerodromes
Figure 5-16. Siting of light units for T-VASIS
5-29
INSTALLATION TOLERANCES
The appropriate authoriry may:
a) :vary the nominal eye height over the thmhold of the
on-slope signal between the limit3 of 12 m and 16 m.
except in cases w h m a standard ILS glide path andor
MLS minimum glide path is available; the height over
thmhold should be varied to ~ o iadny conflict between
the visual approach slope indications and the usable
portion of the ILS glide path a d o r MLS minimum glide
path indications;
b) vary the longitudinal distance between individual light
units or the overall length of the system by not more
than 10 per cent;
c) vary the lateral displacement of the system from the
runway edge by not more than * 3 m;
Note.- The system must be symmetrically displaced
about the runway centre line.
d) where there is a longitudinal slope ofthe ground, adjust
the longitudinal distance of a light unit to compensate
for its difference in levelfiom that of the threshold; and
e) where there is a transverse slope in the ground, adjust
the longitudinal distance oftwo light units or two wing
bars to compensate for the difference in level between
them as necessary to meet the requirements of 5.3.5.16.
The disrance between the wing bar and the threshold is
based on an approach slope of3' to a level runway with a
nominal eye height over the threshold of 15 m. In practice.
the threshold 10 wing bar distance is determined by:
a) the selected approach slope;
b) the longitudinal slope of the rumvoy; and
c) the selected nominal eye height over the thmhold.
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Annex 14 - Aerodromes Volume I
LIGHT UNITS
Figure 5- 17. Light beams and elevation settings of T-VASIS and AT-VASIS
Note.- See 5.3.5.41 to 5.3.5.45 concerning the related runway as white; and when further above the approach
obstacle protection su$ace. slope, see all the units as white; and
PAPI and APAPZ
Description
5.3.5.23 The PAP1 system shall consist of a wing bar of
4 sharp transition multi-lamp (or paired single lamp) units
equally spaced. The system shall be located on the left side of
the runway unless it is physically impracticable to do so.
Note.- Where a runway is used by aircraff requiring
visual roll guidance which is not provided by other external
means, then a second wing bar may be provided on the
opposite side of the runway.
5.3.5.24 The APAPI system shall consist of a wing bar of
2 sharp transition multi-lamp (or paired single lamp) units. The
system shall be located on the left side of the runway unless it
is physically impracticable to do so.
c) when below the approach slope, see the three units
nearest the runway as red and the unit farthest from the
runway as white; and when further below the approach
slope, see all the units as red.
5.3.5.26 The wing bar of an APAPI shall be constructed
and arranged in such a manner that a pilot making an approach
will:
a) when on or close to the approach slope, see the unit nearer
the runway as red and the unit farther from the runway as
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