Description: The state of safety of Aircrafts of Department of defense of Ukraine is appraised. It ensues from the resulted results of calculations, that falling of air ship or his wreckages on the object of the promoted danger an improbable not event, but point estimation of probability of such event, can attain conservative. As measures preventions are entered limit on flights and placing of the air fields. Concrete technical decisions are determined those, what types of events and with what air ship it is needed to take into account at development of protective measures.
Keywords: aviation safety, probability, catastrophe