Federal Aviation Regulations
Sec. 23.1543 — Instrument markings: General.
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.
(c) All related instruments must be calibrated in compatible units.
[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964; 30 FR 258, Jan. 9, 1965, as amended by Amdt. 23–50, 61 FR 5192, Feb. 9, 1996]
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