Regulation (EU) 2025/133
(a) Rotorcraft operated under VFR by day shall be equipped with a means of measuring and displaying the following:
(1) magnetic heading;
(2) time in hours, minutes and seconds;
(3) barometric altitude;
(4) indicated airspeed; and
(5) slip.
(b) Rotorcraft operated under VMC at night, or when the visibility is less than 1 500 m, or in conditions where the rotorcraft cannot be maintained in a desired flight path without reference to one or more additional instruments, shall be, in addition to (a), equipped with:
(1) a means of measuring and displaying the following:
(i) attitude;
(ii) vertical speed; and
(iii) stabilised heading; and
(2) a means of indicating when the supply of power to the gyroscopic instruments is not adequate.
(c) Rotorcraft operated when the visibility is less than 1 500 m, or in conditions where the rotorcraft cannot be maintained in a desired flight path without reference to one or more additional instruments, shall be, in addition to (a) and (b), equipped with a means of preventing malfunction of the airspeed indicating system required in (a)(4) due to condensation or icing.
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