US Army Helicopter Flight Condition Monitoring

The Flight Condition Monitoring (FCM) method of acquiring operational usage data is presented as it was developed from US Army helicopter service usage programs from 1964 to present. The importance of incorporating operational usage data in fatigue design approaches, such as Safe-Life and Damage Tolerance, is discussed with emphasis on the establishment of dynamic component fatigue lives. The Army's service usage programs are critically reviewed to determine areas of sensitivity in establishing design mission spectra for rotary-winged aircraft. The feasibility of utilizing FCM with state-of-the-art microprocessor recorder technology on future in-service programs is presented with suggested unified approaches to mission spectrum development on current and future helicopter systems.