Patent ID: 11867129
Assignee: PRATT & WHITNEY CANADA CORP.
Field: Transport (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 0:
1. A method for operating an aircraft having two or more engines, the method comprising:
operating the aircraft in an asymmetric operating regime in which a first one of the two or more engines is operating in an active mode to provide motive power to the aircraft while a second one of the two or more engines is operating in a standby mode in which the second engine is de-clutched from a gearbox of the aircraft;
receiving one of:
an emergency exit request, and
a normal exit request,
the receiving the normal exit request comprises receiving a first pilot-commanded request to exit the asymmetric operating regime, and the receiving the emergency exit request comprises receiving a system-commanded request to exit the asymmetric operating regime and/or a second pilot-commanded request to exit the asymmetric operating regime different from the first pilot-commanded request to exit the asymmetric operating regime; and

in response to the emergency exit request,
increasing a rotational speed of the second engine, at a maximum permissible speed rate of change associated with the second engine, to a re-clutching speed to re-clutch the second engine to the gearbox while increasing a power output of the first engine at a first maximum permissible power rate of change associated with the first engine, and
when the rotational speed of the second engine reaches the re-clutching speed, increasing a power output of the second engine at a second maximum permissible power rate of change associated with the second engine.