A gas turbine engine particulate ingestion detection system , wherein the particulate is frozen ice particles, comprising: a first particulate sensor (134-1) mounted at a first position on the gas turbine engine , the first position located upstream of a gas turbine engine component , the first particulate sensor configured to sense ice particles at the first position and supply a first sensor signal representative thereof; a second particulate sensor (134-2) mounted at a second position on the gas turbine engine, the second position located downstream of the gas turbine engine component and the first position, the second particulate sensor configured to sense ice particles at the second position and supply a second sensor signal representative thereof; and a processor coupled to receive the first sensor signal and the second sensor signal, the processor configured, upon receipt of the first and second sensors signal, to: determine quantity and size of the ice particles at the first position; determine quantity and size of the ice particles at the second position; determine, based at least on the quantity and size of the ice particles at the first and second positions, an amount of ice accumulated on the gas turbine engine component; compare the amount of ice accumulated on the gas turbine engine component to a threshold value; and generate a signal when the amount exceeds the threshold value; wherein the gas turbine engine component is a fan ; and wherein the first and second sensors are each optical sensors. a first particulate sensor (134-1) mounted at a first position on the gas turbine engine , the first position located upstream of a gas turbine engine component , the first particulate sensor configured to sense ice particles at the first position and supply a first sensor signal representative thereof; a second particulate sensor (134-2) mounted at a second position on the gas turbine engine, the second position located downstream of the gas turbine engine component and the first position, the second particulate sensor configured to sense ice particles at the second position and supply a second sensor signal representative thereof; and a processor coupled to receive the first sensor signal and the second sensor signal, the processor configured, upon receipt of the first and second sensors signal, to: determine quantity and size of the ice particles at the first position; determine quantity and size of the ice particles at the second position; determine, based at least on the quantity and size of the ice particles at the first and second positions, an amount of ice accumulated on the gas turbine engine component; compare the amount of ice accumulated on the gas turbine engine component to a threshold value; and generate a signal when the amount exceeds the threshold value; wherein the gas turbine engine component is a fan ; and wherein the first and second sensors are each optical sensors. determine quantity and size of the ice particles at the first position; determine quantity and size of the ice particles at the second position; determine, based at least on the quantity and size of the ice particles at the first and second positions, an amount of ice accumulated on the gas turbine engine component; compare the amount of ice accumulated on the gas turbine engine component to a threshold value; and generate a signal when the amount exceeds the threshold value; wherein the gas turbine engine component is a fan ; and wherein the first and second sensors are each optical sensors. <EOS>