Altitude alerting system
94.—(1)  An AOC holder must ensure that a small aeroplane that is powered by at least one turbine engine is equipped with an altitude alerting system or device.
(2)  The altitude alerting system or device provided in accordance with paragraph (1) must be capable of —
(a)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;
(b)being tested without special equipment to determine proper operation of alerting signals;
(c)enabling the use of pre‑selected altitudes in increments commensurate with the altitudes at which the aeroplane is approved for use; and
(d)accepting barometric pressure settings if the system or device operates on barometric pressure.
(3)  An AOC holder must ensure that a small aeroplane that —
(a)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.
(4)  The means of indicating assigned altitude required under paragraph (3) —
(a)must be located so that adjustment of the assigned altitude information may be readily made from each pilot seat;
(b)must display assigned altitude information such that the information is clearly visible to all flight crew members whose duties involve monitoring altitude assignment; and
(c)must enable the use of pre-selected altitudes in increments commensurate with the altitudes at which the aeroplane is operated.