| (1) | A large turbine-engine aeroplane shall not be operated unless it is equipped with an altitude alerting system capable of— |
| (a) | alerting flight deck crew members upon approaching preselected altitude in either ascent or descent in sufficient time to establish level flight at such preselected altitude; and |
| (b) | alerting by at least an aural signal the flight deck crew members when deviating above or below a preselected altitude. |
| (2) | A large turbine-engine aeroplane shall not be operated unless such an aeroplane is equipped with a pressure-altitude reporting transponder which operates in accordance with the requirements stipulated in Part 171 and is capable of— |
| (a) | providing pressure-altitude information with a resolution of 25 ft, or better from its aeroplane data source; and |
| (b) | automatically providing information on its airborne or on-ground status by means of a Mode S transponder. |
[Regulation 121.05.4 substituted by regulation 16(f) of Notice No. R. 3170, GG48228, dated 17 March 2023 (Twenty-Sixth Amendment of the Civil Aviation Regulations, 2023)]
