SYSTEM AND METHOD FOR DETECTING AND ACCOMMODATING A LOSS OF TORQUE SIGNAL ON A GAS TURBINE ENGINE

Methods (500) and systems for operating a gas turbine engine (110) comprise obtaining, at a control system (150) associated with the gas turbine engine (110), a measured engine core speed and an actual power demand for the gas turbine engine (110) during operation thereof, determining an expected engine core speed (NG) based on the actual power demand from a predicted relationship between engine core speed and engine output power, comparing the measured engine core speed to the expected engine core speed (NG), detecting a torque-related fault when the measured engine core speed differs from the expected engine core speed (NG) by more than a threshold; and accommodating the torque-related fault when detected.