The JT3D Engines and The Aircraft They Power An illustration of the JT3D engine. A cross section of a JT3D engine. PAC Aero supports the JT3D Series engines, on and off wing. 707, 720 series aircraft. DC-8 50 and 60 series aircraft PAC Aero provides complete engine JT3D borescoping. PAC Aero provides JT3D on and off wing troubleshooting and testing. View another Engine This site was created by dotcomPC