14 CFR Parts 382 and 399; 49 CFR Part 27 - Nondiscrimination on the Basis of Disability in Air Travel: Accessibility of Web Sites and Automated Kiosks at U.S. Airports

(3) Operable parts. Operable parts must comply with section 309 of the 2010 ADA Standards, and the following requirements:

(i) Identification. Operable parts must be tactilely discernible without activation;

(ii) Timing. Where a timed response is required, the user must be alerted visually and by touch or sound and must be given the opportunity to indicate that more time is required;

(iii) Status indicators. Status indicators, including all locking or toggle controls or keys (e.g., Caps Lock and Num Lock keys), must be discernible visually and by touch or sound; and

(iv) Color. Color coding must not be used as the only means of conveying information, indicating an action, prompting a response, or distinguishing a visual element.