Beriev realised that the Be-10 would be ready for trials during the winter of 1955, but Taganrog, where the OKB was located, is ice-bound in winter, so an alternative site was chosen at Gelendzhik on the Black Sea coast, which is clear of ice all year round. The completed components of the first prototype were transported to Ghelendjik where they were assembled and trials begun on 20 December 1955. Initial ground running of the engines revealed potentially disastrous vibration of the rear fuselage, which caused cracking of skin and structural components as well as loosening nuts and fasteners, also the fracture of pipeline and wiring loom support brackets. To reduce the vibration caused by the jet exhaust, the jet-pipes were splayed outboard by a further 3° to 6°. The prototype also underwent trial installation of raised extended air intakes to reduce water ingestion, but they were not adopted for in-service aircraft due to the degradation in performance.