DYNAMIC TEST OF A COMMERCIAL-TYPE PASSENGER SEAT INSTALLATION IN AN H-21 HELICOPTER
AVIATION SAFETY ENGINEERING AND RESEARCH PHOENIX AZ
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Analysis is presented of the crashworthiness characteristics of a commercial helicopter passenger seat as installed in a helicopter which was subjected to a full-scale dynamic crash test. Included among several personnel restraint systems tested in this experiment was a prototype passenger forward-facing seat was occupied on the aisle side by an anthropomorphic dummy and on the wall side by sandbags designed to simulate a second passenger. The dummy was instrumented by accelerometers installed in the pelvic area. A tensiometer in the dummys seat belt recorded seat belt force. A high-speed camera recorded the action of the seat and occupant during the entire crash sequence. The seat maintained its structural integrity to the extent that a properly belted occupant would have been retained both in the seat and in the original location in the cabin. However, large displacements of the arms, legs, and torso of the dummy occurred with respect to the seat, implying severe buffeting of the occupant. The accelerations recorded in the dummy 25-30G lateral and longitudinal and 35-40G vertical probably would have been survivable with moderate injury when sustained under conditions of optimum support, a condition not met in this test.