Airside signs are illuminated at airports that are used at night or in low visibility. Signs, which are illuminated internally, may be of two types. One type has a sign face constructed from material, such as plexiglass, which permits the entire sign face to be illuminated. The other type has a sign face that incorporates embedded fibre optic bundles that illuminate the individual letters, numbers, and arrows, not the face of the sign.

At night or in low visibility, pilots approaching a fibre optic sign will see red illuminated characters on mandatory instruction signs, yellow characters on a location sign, and white characters on all other information signs.

References

TP312 – Aerodromes Standards and Recommended Practices

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