The Dollars and Cents Aspect of Reliability 640552
As a result of less than 100 percent reliability United Air Lines carries a $122,000,000 spare parts inventory and employs thousands of maintenance personnel. A major problem in determining spare parts requirements is the uncertainty of reliability forecasts. There are significant differences between manufacturers’ laboratory derived reliability forecasts and actual airline experience. Of particular concern is the incompatibility of interdependent units and the difference between “true” and “apparent” failures. The sophistication used in component reliability work should now be applied to component to aircraft compatibility and troubleshooting techniques.