(a) Each flight, navigation, and powerplant instrument for use by any
pilot must be easily visible to him from his station with the minimum
practicable deviation from his normal position and line of vision when he
is looking forward along the flight path.
(b) Each instrument necessary for safe operation, including the
airspeed indicator, gyroscopic direction indicator, gyroscopic
bank-and-pitch indicator, slip-skid indicator, altimeter, rate-of-climb
indicator, rotor tachometers, and the indicator most representative of
engine power, must be grouped and centered as nearly as practicable about
the vertical plane of the pilot's forward vision. In addition, for
rotorcraft approved for IFR flight --
(1) The instrument that most effectively indicates attitude must be on
the panel in the top center position;
(2) The instrument that most effectively indicates direction of flight
must be adjacent to and directly below the attitude instrument;
(3) The instrument that most effectively indicates airspeed must be
adjacent to and to the left of the attitude instrument; and
(4) The instrument that most effectively indicates altitude or is most
frequently utilized in control of altitude must be adjacent to and to the
right of the attitude instrument.
(c) Other required powerplant instruments must be closely grouped on
the instrument panel.
(d) Identical powerplant instruments for the engines must be located so
as to prevent any confusion as to which engine each instrument relates.
(e) Each powerplant instrument vital to safe operation must be plainly
visible to appropriate crewmembers.
(f) Instrument panel vibration may not damage, or impair the
readability or accuracy of, any instrument.
(g) If a visual indicator is provided to indicate malfunction of an
instrument, it must be effective under all probable cockpit lighting
conditions. (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), Dept. of Transportation Act (49 U.S.C. 1655(c)))