Impact load for Boeing 747-400 commercial aircraft was obtained with adequate scaling of wellknown dependencies of mass distribution (per unit length) and fuselage buckling load (per unit length) for Boeing 720 aircraft, which J.D.Riera received in 1968. The Boeing 747-400 impact load on a rigid barrier for different values of the impact velocity was found solving the body motion equations in quadratures using the obtained dependencies of Boeing-747-400 mass distribution and fuselage buckling load per length. Conclusive a simplified finite element model of airplane based on Arbitrary Lagrange Euler (ALE) formulation with mass, momentum and energy conservation was proposed for performing plane crash simulations on geometric complex rigid or flexible structures. The detailed description of proposed model is presented