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runway visual range displays in air traffic services units;
and
b) 10 minutes for METAR and SPECI, except that when
the 10-minute period immediately preceding the observation
includes a marked discontinuity in runway visual
range values, only those values occurring after the
discontinuity shall be used for obtaining mean values.
Note.- A marked discontinuity occurs when them is an
abrupt and sustained change in runway visual range, lasting
at least 2 minutes, which maches or passes through criteria
for the issuance of SPECI reports given in 2.3.28.
4.3.5 Runway light intensity
Recommendation.- When instrumented systems are used
for the assessment of runway visual range, computations
should be made separately for each available runway. RVR
should not be computed for a light intensity of 3 per cent or
less of the maximum light intensity available on a runway. For
local routine and special reports, the light intensity to be used
for the computation should be:
a) for a runway with the lights switched on, the light
intensity actually in use on that runway; and
b) for a runway with lights switched o f (or at the lowest
setting pending the msumption of operations), the
optimum light intensity that would be appropriate for
operational use in the prevailing conditions.
h METAR and SPECI, the runway visual range should be
based on the maximum light intensity available on the runway.
Note.- Guidance on the conversion of instrumented
madings into runway visual range is given at Attachment E.
4.3.6 Reporting
4.3.6.1 In local routine and special reports and in
METAR and SPECI, the runway visual range shall be reported
in steps of 25 m when the runway visual range is less than
400 m; in steps of 50 m when it is between 400 m and 800 m;
and in steps of 100 m when the runway visual range is more
than 800 m. Any observed value w hich does not fit the
reporting scale in use shall be rounded down to the nearest
step in the scale.
4.3.6.2 Recommendation.- Fzfi metres should be
considered the lower limit and 2 000 metms the upper limit for
runway visual range. Outside of these limits, local routine and
special reports and METAR and SPECI should memly indicate
that the runway visual range is less than 50 m or more than
2 000 m.
4.3.6.3 In local routine and special reports and in
METAR and SPECI:
a) when runway visual range is above the maximum value
that can be determined by the system in use, it shall be
reported using the abbreviation "ABV in local routine
and special reports and the abbreviation "P" in METAR
and SPECI, followed by the maximum value that can be
determined by the system; and
b) when the runway visual range is below the minimum
value that can be determined by the system in use, it
shall be reported using the abbreviation "BLW" in local
routine and special reports and the abbreviation " M in
METAR and SPECI, followed by the minimum value
that can be determined by the system.
APP 3-6
Appendix 3 Annex 3 - Meteorological Service for International Air Navigation
4.3.6.4 In local routine and special reports: only those values occurring afier the disconti-nuity
should be used to obtain variations.
a) the units of measurement used shall be included;
Note.- A marked discontinuity occurs when there is an
b) if runway visual range is observed from only one abrupt and sustained change in runway visual range, lasting
location along the runway, i.e. the touchdown zone, it at least 2 minutes, which reaches orpasses through criteria for
shall be included without any indication of location; the issuance of SPEC1 given in 2.3.28.
c) if the runway visual range is observed from more than
one location along the runway, the value representative
of the touchdown zone shall be reported first, followed
by the values representative of the mid-point and
stop-end and the locations for which these values are
representative shall be indicated; and
4.4 Present weather
4.4.1 Siting
Recommendation.- When instrumented systems are used
d) when there is more than one in use, the available for observing present weather phenomena listed under 4.4.2.3
runway visual range values for each be and 4.4.2.4, representative information should be obtained by
reported and the runways to which the values refer shall the use ofsensors sited.
be indicated.
4.3.6.5 Recommendation.- h METAR and SPECI: 4.4.2 Reporting
a) only the value representative of the touchdown zone
should be reported and no indication of location on the
runway should be included; and
b) where there is more than one runway available for landing,
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