14 C.F.R. § 27.1543 Instrument markings: general.
Title 14 - Aeronautics and Space
For each instrument— (a) When markings are on the cover glass of the instrument, there must be means to maintain the correct alignment of the glass cover with the face of the dial; and (b) Each arc and line must be wide enough, and located, to be clearly visible to the pilot.
Title 14: Aeronautics and Space
PART 27—AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT
Subpart G—Operating Limitations and Information
Markings and Placards
§ 27.1543 Instrument markings: general.
