2 engines per week is the production rate for A350-900 at Rolls-Royce.

The XWB-84 (the designations reflect maximum thrust in thousands of pounds) exclusively powers the A350-900, which entered service with Qatar Airways at the beginning of the year, with Vietnam Airlines becoming the second operator in recent weeks.

Source: Airbus

Rolls-Royce is currently producing 2 XWB-84s a week –although this has been raised to 4 to test the robustness of the production process and supply chain, said Tim Boddy, head of marketing for the program.

Source: Manuel Belleli

Both suppliers and final assembly line, he said, coped well with the exercise.

He expects output to rise to 5 a week by the end of 2017 –including by then one example of the -97 variant– and to reach 7 a week across the 2 variants by 2020.

Based on the article “Rolls-Royce readies for Trent XWB-97 flight test on A380” published in Flight International.