The Naval Air Warfare Center has conducted an analysis to define the characteristics of small civil turbine engine uncontained debris. The objective of the anlaysis was to define the debris size, weight, exit velocity, and trajectory that can be used to update AC 20-128A. The effort was conducted by gathering historical data from uncontained engine failures. These data included, when available, phase of flight, engine operating condition, the failed engine component, aircraft damage location, and damage size. With this basic information, debris size was correlated to damage size. A methodology developed in the 'Large-Engine Uncontained Debris Analysis' report number DOT/FAA/AR-99/11 was used to estimate debris exit velocity. Representative engine cases and cowls were defined, and existing ballistic penetration equations were used to calculate exit velocity. This analysis was conducted for disk and blade failures on fan, compressor and turbine components. Results of the analysis provided some interesting insight into these events.


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