While it was out, the Missouri History Museum conducted a historic conservation of the Monocoupe, constructed using dope and fabric. The dope shrinks the fabric, which over the years puts pressure on the framework, until the fabric tears to relieve the stress or weaker parts of the interior structure fail. In addition to a thorough cleaning, stress fractures along several seams were repaired.
In nine hours on Oct. 20, the airplane was hoisted back into position over the C Concourse security checkpoint in Terminal 1. However, you can view the entire process in this two-minute time lapse video.
The Monocoupe was one of only three airplanes built completely in St. Louis by Lambert Aircraft Corporation. Lindbergh donated it to the Missouri History Museum in 1940.