Pratt & Whitney has completed a third round of lay-offs in less than a year, with the latest involving 350 salaried employees.
The lay-off on 15 January affected about 200 jobs in Connecticut and 150 more at P&W sites around the world.
The United Technologies subsidiary previously issued lay-off notices to 80 workers in November and another 300 workers last May.
The job reductions occur a few years ahead of an expected production ramp up on the PW1000 PurePower engine series, which is selected for the Airbus A320neo, Bombardier CSeries, Embraer second-generation E-Jet, Mitsubishi Regional Jet and Irkut MS-21.
"Our long-term outlook is very bright," P&W says. "However, to secure this bright future we must address some near-term challenges."
The ramp-up in the commercial business does not begin until 2014 with the CSeries, and P&W continues to face reduced demand for commercial aftermarket services.
"Taking actions to manage our cost structure, while continuing to invest in new programmes, positions Pratt & Whitney for the long term and ensures a strong future for the company, our employees, customers and shareowners," the company says.