Originally Posted by
ATC Watcher
One wing out of 4 . On survivability : the An2 is built like a tank and does not need much speed to keep it flying , hence little energy to dissipate on impact .
He also went straight ahead after the engine failed , also helped.
There is even a monoplane version which they created by, well, removing the bottom set of wings. Actually I'm not sure if it is really the same upper wing but it certainly looks like it in photos.