| (1) | An air service operator shall not operate a large aeroplane unless such aeroplane meets the requirements specified in this Subpart. |
| (2) | Any determination made for the purposes of this Subpart shall be based on approved performance data set out in the aeroplane flight manual for the aeroplane concerned supplemented as necessary with other data acceptable to the Director. |
| (3) | A person may operate an aeroplane without complying with the requirements of this Subpart if the person— |
| (a) | is authorized to do so in the operator's operations specifications; and |
| (b) | complies with the requirements as prescribed in SA-CATS 121. |
| (4) | Where an operator uses charts or graphs published in the approved aeroplane flight manual, allowance should be made to ensure any extract errors will be on the side of safety. |
| (5) | An operator shall adopt obstacle data sufficient to make accurate and safe performance calculations. |
| (6) | In complying with any of the provisions in this Subpart, all factors that significantly affect the performance of an aeroplane, as applicable to any phase of flight, shall be taken into account and shall include as a minimum— |
| (a) | a mass of an aeroplane; |
| (b) | operating procedures employed by an operator; |
| (c) | pressure-altitude appropriate to an elevation of an aerodrome; |
| (g) | surface condition of a runway at the expected time of use. |
[Regulation 121.08.01(6) substituted by regulation 32(n) of Notice No. R.1503, GG45491, dated 15 November 2021 (Twenty-First Amendment of the Civil Aviation Regulations, 2021)]
| (7) | The factors specified in subregulation (6) shall be taken into account either directly as operational parameters or indirectly by means of allowances or margins, which may be provided in the scheduling of performance data or in the comprehensive and detailed code of performance in accordance with which the aeroplane is being operated. |
| (8) | An aeroplane shall be operated in compliance with the terms of its certificate of airworthiness and within the approved operating limitations contained in its flight manual. |
| (9) | A flight shall not be commenced unless the performance information provided in the flight manual, supplemented as necessary with other data acceptable to the Director, indicates that the standards prescribed in this Subpart can be complied with for the flight to be undertaken. |
