14 C.F.R. § 29.1541 General.
Title 14 - Aeronautics and Space
(a) The rotorcraft must contain— (1) The markings and placards specified in §§29.1545 through 29.1565; and (2) Any additional information, instrument markings, and placards required for the safe operation of the rotorcraft if it has 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.
Title 14: Aeronautics and Space
PART 29—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY ROTORCRAFT
Subpart G—Operating Limitations and Information
Markings and Placards
§ 29.1541 General.