The investigation concluded that the engines almost certainly functioned until the final impact, though their behaviour at that particular moment could not be precisely determined. Nevertheless, from the reading of the FDR it was observed that both engines had equal thrust and were set to provide thrust for take-off before power was reduced and the thrust reversers were applied. In order to determine if there was a bird strike, the National Institute for the Investigation of Natural Sciences ("Instituto Nacional de Investigaciones de las Ciencias Naturales") performed a study with negative results.