Materials presented in the paper are the first stage of realization of methodology of ensuring the required level of protection of rocket space complexes from destabilizing action of lightning. The methodology is an obligatory element of ensuring a life cycle of the complexes and is logically integrated into the system of standards of IEC 61508 series. The presented first stage includes a calculated estimation of probability of lightning direct strike into elements of the complex. The estimation was carried out with using a method
based on calculation of distribution of intensity of stationary electric field over the surface of objects of the complex. It is shown that it is sufficient to use only a variant of vertical, in relation to the ground surface, vector of intensity of electric field created by a thundercloud.
