Hi there
Pilatus, it's an FBW HansaJet, which was unusual in that it featured a forward-swept wing.It wasn't a commercial success, so the production run were given/sold to the Luftwaffe, who used them for electronic warfare training for Tornado backseaters and suchlike. Students sit in the cabin and operate equipment that is designed to mimic the kit in the combat jets and attempt to jam radars, decoy SAMs,etc.They could also be used to "sample" other people's radars, for future jamming purposes.
regards
GttC