AIRCRAFT POWER PLANT WITH A TRANSMISSION TO DRIVE AN ELECTRICAL MACHINE

An aircraft power plant (10) comprising: a high-pressure spool (25) including a high-pressure compressor (25A), a high-pressure turbine (25B), and a high-pressure shaft (25C) drivingly engaging the high-pressure turbine (25B) to the high-pressure compressor (25A); a low-pressure spool (24) including a low-pressure compressor (24A), a low-pressure turbine (24B), and a low-pressure shaft (24C) drivingly engaging the low-pressure turbine (24B) to the low-pressure compressor (24A); an electrical machine (50) operable as a generator; and a transmission (60) having a first input (60A) drivingly engaged by the high-pressure shaft (25C), a second input (60B) drivingly engaged by the low-pressure shaft (24C), and an output (60C) drivingly engaging the electrical machine (50), the transmission (60) having a coupling system selectively interconnecting the output (60C) with one of: the first input (60A), with the second input (60B) disconnected from the output (60C); the second input (60B), with the first input (60A) disconnected from the output (60C); and both of the first input (60A) and the second input (60B).