A method for performing structural health predictions for at least one flight critical component in a structural usage monitoring system for a fleet of aircraft with a fleet movement ops center, each aircraft having a flight control computer, avionics, and a HUMS module operating as an interface with the flight control computer and avionics on the aircraft, the aircraft having an onboard display connected to the HUMS module, comprising the steps of: a) recording flight regime rates of occurrence distributions associated with one or more flight regimes for the fleet of aircraft by HUMS modules (46a-n) b) accessing flight regime rates of occurrence distributions associated with one or more flight regimes for the fleet of aircraft by the fleet movement ops center; and c) determining by the fleet movement ops center, using the accessed flight regime distributions, a factor for at least one of the flight regimes that provides a predetermined amount of reliability for a component on each aircraft on the fleet of aircraft known to be affected through at least fatigue damage by the at least one flight regime, d) receiving, by HUMS modules (46a-n), at least the factor, determining a modified lifetime of the component for a selected one of the aircraft from the fleet using the factor, characterized by e) displaying, on the display, the modified lifetime for at least one flight critical component to the user of the aircraft, f) wherein said determining, using the accessed flight regime distributions, a factor for at least one of the flight regimes that provides a predetermined amount of reliability for a component on each aircraft on the fleet of aircraft known to be affected through at least fatigue damage by the at least one flight regime includes: A) identifying a critical flight regime from the occurrence distribution; B) determining a 90th percentile usage value for the critical flight regime in the occurrence distribution; C) determining a 50th percentile usage value for the critical flight regime in the occurrence distribution; and D) defining the factor as a ratio between the 90th percentile and 50th percentile usage values for the critical flight regime.. a) recording flight regime rates of occurrence distributions associated with one or more flight regimes for the fleet of aircraft by HUMS modules (46a-n) b) accessing flight regime rates of occurrence distributions associated with one or more flight regimes for the fleet of aircraft by the fleet movement ops center; and c) determining by the fleet movement ops center, using the accessed flight regime distributions, a factor for at least one of the flight regimes that provides a predetermined amount of reliability for a component on each aircraft on the fleet of aircraft known to be affected through at least fatigue damage by the at least one flight regime, d) receiving, by HUMS modules (46a-n), at least the factor, determining a modified lifetime of the component for a selected one of the aircraft from the fleet using the factor, characterized by e) displaying, on the display, the modified lifetime for at least one flight critical component to the user of the aircraft, f) wherein said determining, using the accessed flight regime distributions, a factor for at least one of the flight regimes that provides a predetermined amount of reliability for a component on each aircraft on the fleet of aircraft known to be affected through at least fatigue damage by the at least one flight regime includes: A) identifying a critical flight regime from the occurrence distribution; B) determining a 90th percentile usage value for the critical flight regime in the occurrence distribution; C) determining a 50th percentile usage value for the critical flight regime in the occurrence distribution; and D) defining the factor as a ratio between the 90th percentile and 50th percentile usage values for the critical flight regime.. A) identifying a critical flight regime from the occurrence distribution; B) determining a 90th percentile usage value for the critical flight regime in the occurrence distribution; C) determining a 50th percentile usage value for the critical flight regime in the occurrence distribution; and D) defining the factor as a ratio between the 90th percentile and 50th percentile usage values for the critical flight regime..