Methods and apparatus for generating usage severity indices

A method, comprising:

• determining a first usage severity index for a drive system of an aircraft based on a highest cyclic index associated with engine torque data of a first engine and a second engine, the highest cyclic index excluding a ground-air-ground cycle;
• determining a second usage severity index for forward and aft rotor systems of the aircraft based on cruise guide indicator data;
• determining a third usage severity index for a pylon of the aircraft based on flight regime data;
• generating a flight-based usage severity index for the aircraft using the first usage severity index, the second usage severity index, and the third usage severity index;
• and
• adjusting usage of the aircraft based on the flight-based usage severity index, the flight-based usage severity index to validate a retirement life of one or more aircraft components.

A non-transitory machine readable storage medium comprising instructions to cause programmable circuitry to at least:

• determine a first usage severity index for a drive system of an aircraft based on a highest cyclic index associated with engine torque data of a first engine and a second engine, the highest cyclic index excluding a ground-air-ground cycle;
• determine a second usage severity index for a rotor system of the aircraft based on cruise guide indicator data;
• determine a third usage severity index for a pylon structure of the aircraft based on flight regime data;
• generate a flight-based usage severity index for the aircraft using the first usage severity index, the second usage severity index, and the third usage severity index;
• and
• adjust usage of the aircraft based on the flight-based usage severity index, the flight-based usage severity index to validate a retirement life of one or more aircraft components.