US Patent 11333035 Shaft shear detection in a gas turbine engine

A shaft event is detected, such as a shaft shear, a shaft decoupling, and/or a shaft failure in a gas turbine engine comprising a first spool and a second spool different from the first spool. First and second parameters indicative of the power of the first spool and a load transfer through a shaft of the second spool are obtained. A detection threshold is determined as a function of the first parameter. The second parameter is compared to the detection threshold. The shaft event is detected when the second parameter is beyond the detection threshold and then a signal indicative of the shaft event is transmitted.