which is 19 6 mn the second level of load resistance is the range of loads between 19 6 and 244 mn where the latter is the required load to displace the outer shield to the position of maximum displacement the third level of load resistance is defined by loads higher than 244 mn in the previous example the landing weight the landing speed and the impact force of the aircraft are representative values for a jumbo jet it was shown that the total kinetic energy of the aircraft could be absorbed in displacing the outer shield alone which indicates that this structural system is capable of protecting the main structure against even higher impactive or impulsive loads moreover it should be noticed that following the impact the displaced outer shield should exert additional moments on the main structure due to the eccentricity of the structure 39 s own weight in this case this moment should increase the stresses at some locations however these additional stresses should not be significant due to the small ratio between the maximum displacement and the radius of the structure which is in this example 0 36 20 0 0 018 furthermore if the force required to displace the outer shield is very high due to the large surface area of the main structure and consequently the large surface area of the crushable layer then it is possible to decrease this force by creating recesses in the.