In 1970 Tu-134A modification was developed. More perfect D-30 engines of the second series with the reduced fuel consumption and a draught reverse were installed, the brake shield was removed as well. Number of places was increased to 76 at the expense of fuselage lengthening on 2,1 M. In 1980 the issue of Tu-134B modification began. On this modification the navigator RLS (radar-tracking system) "Groza-134" was installed instead of a nasal cabin. It allowed to combine the functions of the navigator and the second pilot and to reduce the crew to 3 people. The quantity of places for passengers was increased to 80 people.