In 1967 a single Comanche, N4600Y, was modified by Swearingen with a pressurised cabin.
The prototype, powered by a 260-hp Lycoming TIO-540 engine and equipped with Twin Comanche landing gear, tail and wings and a new fuselage, was first flown on 11 March 1967.
The Comanche crashed on takeoff from Lock Haven 23 March 1967 when the pilot had problems with the electric nosewheel. The project was then cancelled and removed from the Register in 1969.
All Aero 