Text in force at 27-51: from 27-0, effective 1 Feb 1965.
(a) The rotorcraft must contain--
(1) The markings and placards specified in Secs. 27.1545 through 27.1565, and
(2) Any additional information, instrument markings, and placards required for the safe operation of rotorcraft with unusual design, operating or handling characteristics.
(b) Each marking and placard prescribed in paragraph (a) of this section--
(1) Must be displayed in a conspicuous place; and
(2) May not be easily erased, disfigured, or obscured.
29 FR 15695 · Source