(1) Background: It is difficult for accident investigators to objectively determine whetherspatial disorientation may have contributed to a fatal airplane accident. In this paper, we evaluatethree methods to reconstruct the possible occurrence of the somatogravic illusion based on flightdata recordings from an airplane accident. (2) Methods: The outputs of two vestibular models werecompared with the “standard” method, which uses the unprocessed gravito-inertial acceleration(GIA). (3) Results: All three methods predicted that the changing orientation of the GIA wouldlead to a somatogravic illusion when no visual references were available. However, the methodswere not able to explain the first pitch-down control input by the pilot flying, which may have beentriggered by the inadvertent activation of the go-around mode and a corresponding pitch-up moment.Both vestibular models predicted a few seconds delay in the illusory tilt from GIA due to centralprocessing and sensory integration. (4) Conclusions: While it is difficult to determine which methodbest predicted the somatogravic illusion perceived during the accident without data on the pilot’spitch perception, both vestibular models go beyond the GIA analysis in taking into account validatedvestibular dynamics, and they also account for other vestibular illusions. In that respect, accidentinvestigators would benefit from a unified and validated vestibular model to better explain pilotactions in accidents related to spatial disorientation.