GM2 MET.TR.210 Observing meteorological
elements
OPERATIONALLY DESIRABLE ACCURACY OF
OBSERVATION
|
Element to be observed |
Operationally desirable accuracy of measurement or observation* |
|
Mean surface wind |
Direction: ± 10° Speed: ± 1 kt up to 10 kt ± 10 % above 10 kt |
|
Variations from the mean surface wind |
± 2 kt, in terms of longitudinal and lateral
components |
|
Visibility |
± 50 m up to 600 m ± 10 % between 600 m and
1 500 m ± 20 % above 1 500 m |
|
Runway visual range |
± 10 m up to 400 m ± 25 m between 400 m and 800 m ± 10 % above 800 m |
|
Cloud amount |
± 1 okta |
|
Cloud height |
± 33 ft up to 330 ft ± 10 % above 330 ft |
|
Air temperature and dew-point temperature |
± 1°C |
|
Pressure value (QNH, QFE) |
± 0.5 hPa |
|
* The operationally desirable accuracy is not intended as an operational
requirement; it is to be understood as a goal that has been expressed by the
operators. |
|
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