Health and Usage Monitoring Systems (HUMS) is a generic term given to activities that utilize data collection and analysis techniques to help ensure availability, reliability and safety of vehicles. Activities similar to, or sometimes used interchangeably with, HUMS include Condition Based Maintenance

Condition Based Maintenance

Condition-based maintenance , shortly described, is maintenance when need arises. This maintenance is performed after one or more indicators show that equipment is going to fail or that equipment performance is deteriorating....

 (CBM) and Operational Data Recording (ODR). This term HUMS is often used in reference to airborne craft and in particular rotor-craft – the term is cited as being introduced by the offshore oil industry after a commercial Chinook crashed in the North Sea, killing all but two passengers in 1986.
HUMS are now used not only for safety but for a number of other reasons including

• Maintenance: reduced mission aborts, fewer aircraft on ground (AOG), simplified logistics for fleet deployment
• Cost: “maintain as you fly” maintenance flights are not required. Performing repairs when the damage is minor increases the aircraft mean Time Before Failure (MTBF) and decreases the Mean Time to Repair (MTTR)
• Operational: improved flight safety, mission reliability and effectiveness
• Performance: improved aircraft performance and reduced fuel consumption

External links

• Aviation todayhttp://www.aviationtoday.com/am/categories/bga/76.html
• BAE Systemshttp://www.baesystems.com/ProductsServices/baes_aei_health_usage_mon.html
• Aeronautic Investments http://blog.aeroinvestments.com/engineering/flight-data-monitoring/