12/31/2008. Partenavia developed a turboprop powered version of the P.68 in the late 1970s. The six-seat prototype P.68T, I-PAIT c/n 6001 was fitted with two 330 shp Allison 250-B17B engines and a retractable landing gear, it was flown for the first time on September 11, 1978. An eight/nine-seat version development, with an all-moving tail plane and fixed undercarriage, was designated AP.68TP-100, the prototype I-RAIP c/n 8001 was first flown on November 20, 1981.

The production model with a fixed tail plane and separate elevators was designated AP.68TP-300 (subsequently named Spartacus), and the first,
I-RAIK, flew for the first time on April 1, 1983 and obtained its Italian Type Certificate in the following December. It reappeared in 1984 designated AP.68TP-300 Spartacus and registered as I-SPRV. Subsequently it was listed on the Swiss Registry as HB-LQW and came on the FAA Registry as N313LC and has since been reregistered to N75CY.