A French-made Sud Caravelle...a rare find in the US. United used to fly them in the 60s. http://en.wikipedia.org/wiki/Sud_Caravelle That article says: " * An unidentified Caravelle model is located at the Pima Community College Aviation Technology Center, 7211 S. Park Avenue, Tucson Arizona. The aircraft has been stripped of any paint/markings, and is easily seen from the roadway that passes just west of the Center."
http://www.airliners.net/open.file/1140340/L/
Why did you call it "Landing gear problem" ?