They determined that the JT8D-200 engine could be used on the two side-mounted pylons , but the structural changes to fit the larger-diameter engine ( 49.2 inches ( 125 cm ) fan diameter in the JT8D-200 compared to 39.9 inches ( 101 cm ) in the JT8D-7 ) into the fuselage at the number two engine location were prohibitive .
They said that the JT8D-200 engine could be used .