Aircraft operating under VFR
89.  An AOC holder must ensure that a relevant aircraft that is to be flown in accordance with the Visual Flight Rules is equipped with a means of measuring and displaying —
(a)magnetic heading;
(b)the time in hours, minutes and seconds;
(c)barometric altitude;
(d)indicated airspeed;
(e)mach number, if the speed limitation prescribed by the aircraft flight manual is expressed in terms of mach number; and
(f)turn direction and rate of turn, if the aircraft is a helicopter.