The operator shall not operate a helicopter in accordance with IFR, unless such helicopter is equipped with-
(a) a magnetic compass;
(b) an accurate time-piece on board indicating the time in hours, minutes and seconds;
(c) two sensitive pressure altimeters with subscale settings, calibrated in hectopascals, adjustable for any barometric pressure setting likely to be encountered during flight;
(d) in the case of a helicopter having a maximum certificated mass exceeding 3 180 kilograms, a radio altimeter with an audio warning operating below a pre-set height and a visual warning capable of operating at a height selectable by the pilot;
(e) an airspeed indicator system with heated pitot tube or equivalent means for preventing malfunctioning due to either condensation or icing, including a warning indicator of pitot heater failure;
(f) a vertical-speed indicator;
(g) a turn-and-slip indicator or in lieu thereof, an additional attitude indicator powered by a power source separate from that of the main attitude indicator;
(h) an attitude indicator;
(i) a single standby attitude indicator, capable of being used from either pilot’s station, which-
(i) is powered continuously during normal operation and, after a total failure of the normal electrical generating system, is powered from a source independent of the normal electrical generating system;
(ii) provides reliable operation for a minimum of 30 minutes after total failure of the normal electrical generating system, taking into account other loads on the emergency power supply and operational procedures;
(iii) operates independently of any other attitude indicating system;
(iv) is operative automatically after total failure of the normal electrical generating system; and
(v) is appropriately illuminated during all phases of operation:
Provided that if the standby attitude instrument system is capable of being used through flight attitudes of 360° of pitch and roll, the turn-and-slip indicators may be replaced by slip indicators;
(j) a stabilised direction indicator;
(k) a means of indicating on the flight deck the outside air temperature in degrees Celsius;
(l) an alternate source of static pressure for the altimeter and the airspeed and vertical speed indicators; and
(m) a chart holder in an easily readable position which can be illuminated, if to be operated by night;
(n) communication, navigation and surveillance equipment as prescribed in Regulations 91.05.1 and 91.05.2.