49 CFR Part 27 - Nondiscrimination on the Basis of Disability in Programs or Activities Receiving Federal Financial Assistance (with amendments issued through Aug. 2015)

(6) Input. Input devices must comply with paragraphs (k)(6)(i) through (iv) of this section.

(i) Input controls. At least one input control that is tactilely discernible without activation must be provided for each function. Where provided, key surfaces not on active areas of display screens, must be raised above surrounding surfaces. Where touch or membrane keys are the only method of input, each must be tactilely discernible from surrounding surfaces and adjacent keys.

(ii) Alphabetic keys. Alphabetic keys must be arranged in a QWERTY keyboard layout. The “F” and “J” keys must be tactilely distinct from the other keys.

(iii) Numeric keys. Numeric keys must be arranged in a 12-key ascending or descending keypad layout or must be arranged in a row above the alphabetic keys on a QWERTY keyboard. The “5” key must be tactilely distinct from the other keys.

(iv) Function keys. Function keys must comply with paragraphs (k)(6)(iv)(A) and (B) of this section.

(A) Contrast. Function keys must contrast visually from background surfaces. Characters and symbols on key surfaces must contrast visually from key surfaces. Visual contrast must be either light-on-dark or dark-on-light. However, tactile symbols required by (k)(6)(iv)(B) are not required to comply with paragraph (k)(6)(iv)(A) of this section.

(B) Tactile symbols. Function key surfaces must have tactile symbols as follows: Enter or Proceed key: raised circle; Clear or Correct key: raised left arrow; Cancel key: raised letter ex; Add Value key: raised plus sign; Decrease Value key: raised minus sign.