I. Background
For civil aircraft, airworthiness regulations must be met. Aircraft are flown with water landings in mind. The FAA and European Joint Airworthiness Regulations require that all large transport aircraft must be validated for water landing performance by model tests or by analysis and extrapolation by analogy. China's civil aircraft airworthiness regulations on the civil aircraft water forced landing capability of the validation has also made clear provisions [1]. Civil aircraft must meet the airworthiness regulations if they want to obtain the airworthiness certificate. Therefore, the study of civil aircraft landing on water is essential to obtain the airworthiness certificate.