초록 ▼

A turbine fan speed monitor for use with an aircraft engine which monitors actual fan speeds for each of a plurality of aircraft engines. The apparatus also input instantaneous values of total air temperature, pressure altitude, altitude rate, and the position of the wheels. The fan speed monitor ca

A turbine fan speed monitor for use with an aircraft engine which monitors actual fan speeds for each of a plurality of aircraft engines. The apparatus also input instantaneous values of total air temperature, pressure altitude, altitude rate, and the position of the wheels. The fan speed monitor calculates an overspeed limit value for the turbine fan as a function of each of the total air temperature, pressure altitude, altitude rate, and position of the wheels data and indicates when the actual fan speed exceeds the overspeed limit value for each monitored engine. The monitor warns the pilot of calculated overspeed conditions that he can control by throttle manipulation. Engine life is related to the calculated speeds at take-off, climb and cruise. The monitor keeps a record of the time and duration of these instances when the actual fan speed exceeds the overspeed limit for any engine. The monitor may also include a display to indicate the value of any of the calculated or sensed parameters including the frequency of the actual fan speed exceeding the overspeed limit for any engine. The monitor may also include data entry controls to manually input engine data previously accumulated for a monitored engine.

대표청구항 ▼

A turbine fan speed monitor for use with at least one aircraft engine having a rotating turbine fan with a variable overspeed limit value comprising: an RPM sensor for continually detecting actual fan rotational speeds of at least one aircraft engine; an environmental condition sensor for continuall

A turbine fan speed monitor for use with at least one aircraft engine having a rotating turbine fan with a variable overspeed limit value comprising: an RPM sensor for continually detecting actual fan rotational speeds of at least one aircraft engine; an environmental condition sensor for continually detecting environmental data defining at least total air temperature, pressure altitude and altitude rate; and a computer, electrically connected to the RPM sensor and the environmental condition sensor, for recording the actual fan speeds, for recording the environmental data, for determining overspeed limit values for each monitored aircraft engine as a function of the environmental data, and for comparing the overspeed limit values with the actual fan rotation speeds, the computer including memory means for recording at least the frequency of the actual fan speeds exceeding the overspeed limit values for each monitored engine.