CRASH LOADS ENVIRONMENT STUDY.
MECHANICS RESEARCH INC EL SEGUNDO CALIF
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The report provides a study of the survivable crash environment for commercial type aircraft. The study includes an analysis of the results of previous crash tests on both full-scale aircraft and aircraft components, as well as the data from actual commercial aircraft crashes during the period of 1955 through 1965. The data from the previous full-scale tests have been analyzed in a unique manner. The severity of each crash test has been determined by relating the characteristics of the measured acceleration time histories to the characteristics of human tolerance to acceleration. Shock spectra were obtained for all the pertinent acceleration time histories from crash tests and the methods determining equivalent pulses are presented. The application of this method to the specification of component test environment is discussed. The data from actual commercial crashes is presented and analyzed. It was found that the most common survivable accident can be described as occurring during the landing phase of the flight, with null pitch, roll and yaw angles, with an angle of impact of less than five degrees and with an impact velocity of 166 feet per second. The most common obstacle encountered during the crash was trees. The requirements for future crash tests on both full-scale aircraft and components are presented. These requirements are based on the results of the study. The crash parameters are selected for a modern jet aircraft to produce a marginally survivable accident. The instrumentation requirements are discussed and a data acquisition system is recommended. Author
- Civilian Aircraft