There are literally dozen of aeromedical flights daily by private contractors, not unlike those National Patient Transport non-emergency ambulances you seendriving around for example. They are not required to meet the same standards as RFDS operations in terms of procedures and aircraft type because they are not the same thing.
The frustrating thing is that with no engines it possibly would have made it however you don't always assume it's not going to fly on one on the way back.