Sec. 25.1555 - Control markings.
(a) Each cockpit control, other than
primary flight controls and controls whose function is obvious, must be
plainly marked as to its function and method of operation.
(b) Each aerodynamic control must be
marked under the requirements of §§25.677 and 25.699.
(c) For powerplant fuel controls --
(1) Each fuel tank selector control must
be marked to indicate the position corresponding to each tank and to each
existing cross feed position;
(2) If safe operation requires the use
of any tanks in a specific sequence, that sequence must be marked on, or
adjacent to, the selector for those tanks; and
(3) Each valve control for each engine
must be marked to indicate the position corresponding to each engine
(d) For accessory, auxiliary, and
emergency controls --
(1) Each emergency control (including
each fuel jettisoning and fluid shutoff must be colored red; and
(2) Each visual indicator required by
§25.729(e) must be marked so that the pilot can determine at any time when
the wheels are locked in either extreme position, if retractable landing
gear is used.