I’ve done some digging into MD aircraft, and I’ve noticed the MD-80 and the MD-11 have foldable landing lights. On the MD-11 they’re located on the side of the body and pop out to face frontwards.
It has 3 modes:
EXTEND (extended/light off)
ON (extended light on)
This is very unique, and I’d love for this to be put on the MD-11 model! As far as I know, on the MD-80 the foldable lights create drag once deployed, I’d assume the same would be for the MD-11, so it would be cool if the lights would affect the physics of the plane as well.
In this picture the light is located under the first passenger window, just before the door.
Photo by: Sebastian Fernandez Bielkiewicz/Simplementevolar: http://imgproc.airliners.net/photos/airliners/8/5/7/1567758.jpg?v=v40