Regulation 93

alerting the pilot to an approaching pre‑selected altitude by means of visual and aural signals, such that the pilot may establish level flight from climb or descent without exceeding the pre-selected altitude;

being tested without special equipment to determine proper operation of alerting signals;

enabling the use of pre‑selected altitudes in increments commensurate with the altitudes at which the aeroplane is approved for use; and

accepting barometric pressure settings if the system or device operates on barometric pressure.

is to be operated in accordance with the Instrument Flight Rules; and (b)is not required to carry an altitude alerting system or device under paragraph (1), is equipped with a means of indicating an altitude assigned by an appropriate air traffic control unit.

must be located so that adjustment of the assigned altitude information may be readily made from each pilot seat;

must display assigned altitude information such that the information is clearly visible to all flight crew members whose duties involve monitoring altitude assignment; and

must enable the use of pre‑selected altitudes in increments commensurate with the altitudes at which the aeroplane is operated.