Section 27.1321 - Arrangement and visibility(a) Each flight, navigation, and powerplant instrument for use by any pilot must be easily visible to him.(b) For each multiengine rotorcraft, identical powerplant instruments must be located so as to prevent confusion as to which engine each instrument relates.(c) Instrument panel vibration may not damage, or impair the readability or accuracy of, any instrument.(d) If a visual indicator is provided to indicate malfunction of an instrument, it must be effective under all probable cockpit lighting conditions.Doc. No. 5074, 29 FR 15695, Nov. 24, 1964; 29 FR 17885, Dec. 17, 1964, as amended by Amdt. 27-13, 42 FR 36971, July 18, 1977 Secs. 313(a), 601, 603, 604, and 605 of the Federal Aviation Act of 1958 (49 U.S.C. 1354(a) , 1421 , 1423 , 1424 , and 1425 ) ; and sec. 6(c) of the Dept. of Transportation Act (49 U.S.C. 1655(c)