Selection criteria for propulsion engines for passenger aircraft, using the AIRBUS A330neo and A350 as examples.

This article analyses the reasons why the Rolls-Royce Trent XWB engines, which are used in the A350 model, were not used in the Airbus A330 modernisation programme for the A330neo version. It presents the main design assumptions of the A330neo programme and describes the scope of changes introduced in relation to the previous A330ceo (Current Engine Option) version. The characteristics of the Rolls-Royce Trent 7000 engines used are compared with those of the Trent XWB engines in terms of technical parameters, design, and adaptation to the specific requirements of the airframe. The article also discusses economic and logistical factors, including the costs of redesigning the airframe, the A330neo's market positioning relative to the A350, and the impact of collaborating with Rolls-Royce on the programme's implementation. The certification requirements relating to the potential integration of the Trent XWB engines into the A330 design, along with the associated financial and time risks, are presented. Overall, the article demonstrates that choosing the Trent 7000 engines was a reasonable compromise between technological efficiency and economic viability, enabling the A330neo to remain a competitive, less expensive alternative to the Airbus A350.