A new class of algorithms for identification of dynamic parameters of aircraft and their onboard equipment that is suitable for processing low-dynamic transients recorded during aircraft flight test state is described. Traditional computing algorithms are not adapted for such situations when it is necessary to find the inverses of ill-conditioned matrices of systems of identification equations. Therefore, more efficient algorithms have been developed on the basis of their symbolical combinatory models (SC models). They have allowed to derive symbolical descriptions of algorithms, which are suitable for realization of parallel modes of calculations necessary for increasing the performance of algorithms in real-time mode of test flights. Such performance is necessary to ensure indication of occurrence of emergency situations in the functioning of aircraft onboard equipment.