NCO.IDE.A.120 Operations under VFR — flight and navigational instruments and associated equipment

(a) Aeroplanes 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)  Mach number, whenever speed limitations are expressed in terms of Mach number.

(b) Aeroplanes operated under visual meteorological conditions (VMC) at night, or in conditions where the aeroplane 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)  turn and slip;

(ii)  attitude;

(iii)  vertical speed; and

(iv)  stabilised heading;

 and

(2)  a means of indicating when the supply of power to the gyroscopic instruments is not adequate.

(c) Aeroplanes operated in conditions where they 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.