Why is the Sabreliner listed as "experimental"? This is an aircraft type, of which 800 were built, between 1959 and 1982.
Is it listed as experimental because BAE were doing such major alterations to the airframe as part of a defence project, that those modifications effectively returned the Sabreliner to a new and experimental style of airframe?
If such is the case, one has to wonder if this had any bearing on the causes of the incident. Pilots possibly distracted by unexpected behaviour of instruments/aircraft handling, or new features fitted?