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2.2 — Discrimination between lights Besluit toezicht luchtvaart BES

Discrimination between lights

2.2.1 If there is a requirement to discriminate yellow and white from each other, they shall be displayed in close proximity of time or space as, for example, by being flashed successively from the same beacon.

2.2.2 If there is a requirement to discriminate yellow from green and/or white, as for example on exit taxiway centre line lights, the y coordinates of the yellow light shall not exceed a value of 0.40.

Note – The limits of white have been based on the assumption that they will be used in situations in which the characteristics (color temperature) of the light source will be substantially constant.

2.2.3 The color variable white is intended to be used only for lights that are to be varied in intensity, e.g. to avoid dazzling. If this color is to be discriminated from yellow, the lights shall be so designed and operated that:

a) the x coordinate of the yellow is at least 0.050 greater than the x coordinate of the white; and

b) the disposition of the lights will be such that the yellow lights are displayed simultaneously and in close

proximity to the white lights.

2.2.4 The color of aeronautical ground lights shall be verified as being within the boundaries specified in Figure A1-1 by measurement at five points within the area limited by the innermost isocandela curve (isocandela diagrams in Appendix 2 refer), with operation at rated current or voltage. In the case of elliptical or circular isocandela curves, the color measurements shall be taken at the centre and at the horizontal and vertical limits. In the case of rectangular isocandela curves, the color measurements shall be taken at the centre and the limits of the diagonals (corners). In addition, the color of the light shall be checked at the outermost isocandela curve to ensure that there is no color shift that might cause signal confusion to the pilot.

Note 1 – For the outermost isocandela curve, a measurement of color coordinates shall be made and recorded for review and judgment of acceptability by the appropriate authority.

Note 2 – Certain light units may have application so that they may be viewed and used by pilots from directions beyond that of the outermost isocandela curve (e.g. stop bar lights at significantly wide runway-holding positions). In such instances, the appropriate authority shall assess the actual application and if necessary require a check of color shift at angular ranges beyond the outermost curve.

2.2.5 In the case of visual approach slope indicators and other light units having a color transition sector, the color shall be measured at points in accordance with 2.2.4, except that the color areas shall be treated separately and no point shall be within 0.5 degrees of the transition sector.

Regeling
Besluit toezicht luchtvaart BES
Soort
AMvB-BES
Geldend vanaf
01-01-2021
BWB-id
BWBR0028721
Versie
2021-01-01_0

In de hele regeling · Officiële tekst op wetten.overheid.nl