Originally Posted by
Wizofoz
I do see your point.
"Unless authorised by the administrator"= ETOPS, which have been developed especially for twin engined, turbine powered aircraft.
If you want to fly a piston twin more than one hour from an airport the answer is usually no except for special authorisations such as ferry flights.
How does the reliability of a piston engine newly designed in 2006 compare with the reliability of a piston engine designed in 1956? What about comparing a piston engine of 2006 with a turbine engine of 1966 or 1986?
Is there any literal regulatory rule that even if a piston engine were to demonstrate IFSD statistic matching the ETOPS thresholds, it would be ineligible to ETOPS just because it is a piston engine?