A version with turbocharged engines for higher altitude flight was also developed, and the PA-39 was a version with counter-rotating engines (to eliminate the critical engine) that replaced the PA-30 in the early 1970s.
A version with turbocharged engines for higher altitude flight was also developed, using IO-C1A engines of the same nominal power. The PA-39 was a version with counter-rotating engines (to eliminate the critical engine) that replaced the PA-30 in the early 1970s.