Donahue says it's not likely this could have happened during flight when the auxiliary power unit was not in use.

CNN: Fire aboard empty 787 Dreamliner prompts investigation

Flight 186's auxiliary power unit failed during the wait and the aircraft had to return to a gate.

WSJ: Flight Nightmares Overshadow Airlines�� Improving Record

If the project is approved, engineers would hope to have the propulsion unit, or service module, ready to fly on the American rocket's first test flight.

BBC: European tech could propel Nasa's Orion capsule

This is made possible by an active articulated torsional drive unit, which in combination with a complex control system attains an unprecedented level of efficiency in flight operation.

FORBES: Festo Builds a Robot Bird

As low budget films go, they needed someone to handle props for the 2nd unit Ariel team so, I spent many weeks dressing up pilots and other extra cast members in WWII flight gear for the aerial shots in the movie.

FORBES: George Lucas and The Problem With Hollywood