CS 22.1322 Warning, caution, and advisory lights
ED Decision 2003/13/RM
If warning, caution, or advisory lights are installed in the cockpit, they must, unless otherwise approved by the Agency, be:
(a) Red, for warning lights (lights indicating a hazard which may require immediate corrective action);
(b) Amber, for caution lights (lights indicating the possible need for future corrective action);
(c) Green, for safe operation lights; and
(d) any other colour, including white, for lights not described in sub-paragraphs (a) to (c) of this paragraph, provided the colour differs sufficiently from the colours prescribed in sub-paragraphs (a) to (c) of this paragraph to avoid possible confusion.
(e) Effective under all probable cockpit lighting conditions.
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