In article ,
James Robinson wrote:

I found some photos of the resulting damage. There are also some
comments at the bottom of the page that suggest the screw jacks failed,
as they are both broken in half:

http://www.beechcraft.org/b17-accident/

Also a link to the local TV station video:

http://tinyurl.com/2njqf

It is more likely that the screw jacks failed as a result of an
inadvertant throwing of the retraction switch. It isn't the first time
that has happened, and probably not the last!