 The AE75 engine has a TBO of only 800 hours, and, in the absence of continuing factory support, many ARVs have had their AE75s replaced with engines such as the Rotax 912, the Rotax 914, or the Jabiru 2200.Three ARVs were originally manufactured with the MidWest twin-rotor wankel engine.The Super2 gained airworthiness certification in July 1986, and soon after entered production.