Engines for ETOPS
Which planes can apply for ETOPS?
Twinjets can apply for ETOPS over 60 minutes, from 75 to 207 minutes - and if the airframe, engine and airline qualify, they can get it.
Are nonjets permitted to apply for ETOPS? Say, a twin turboprop - if the engine, airframe and airline meet the necessary qualifications, are they allowed to fly under ETOPS?
And what about other engine types? Like piston of wankel twins - can they apply for ETOPS?
And what about trimotors? Trijets can fly arbitrarily long routes without any extra ETOPS limits, but propeller aircraft need 4 engines for long-haul without extra qualifications. Can trimotors apply for ETOPS?
Are geared turbofans classed as jets or as turboprops? What about propfans?