The first Tu-124A prototype , SSSR-45075 , first flew on 29 July 1963 . On 22 October 1963 , the prototype British BAC One-Eleven , which had a similar layout , crashed with the loss of all crew while testing its stalling properties . The aircraft had entered pitch-up : the high-mounted tailplane became trapped in the turbulent wake produced by the wings ( deep stall ) , which prevented recovery from the stall . As a result , the tailplane on Tu-124A was enlarged by 30 % for greater control authority . Since Aeroflot 's requirements dictated a larger aircraft than initially planned , the Soloviev Design Bureau developed the more powerful D-30 low-bypass turbofan engines . On 20 November 1963 , the new airliner was designated Tu-134
crashed with the loss of all crew
1963 BAC One-Eleven test crash
Tupolev Tu-134