公开(公告)号：US20250043737A1

公开(公告)日：2025-02-06

申请号：US18362953

申请日：2023-07-31

Applicant: Textron Innovations Inc.

Inventor： Thomas Dewey Parsons ,  Marc Ouellet ,  Daniel Carrier

IPC: F02C9/42 ,  F02C7/06 ,  F02C7/268

Abstract: Embodiments are directed to operating a multi-engine aircraft during a cruise flight condition. A first engine is put off-line during flight while allowing a second engine to continue operating. The second engine provides sufficient power to maintain the multi-engine aircraft in the cruise flight condition. An outside air temperature, a first engine temperature, and/or an engine oil temperature is monitored and, when the temperature is below a predetermined threshold, the engine oil for the off-line first engine is warmed. The off-line engine oil may be warmed by continuously or periodically cranking the first engine without restarting the first engine. Alternatively, the engine oil may be warmed using a heat exchanger, such as an air-to-oil or oil-to-oil heat exchanger, or by using electronic heaters on an oil tank.