"It's the softer option. Power on run-on landing at **knots?
Not possible without at least one engine of course.
The auto without the fan has probably never been proven nor does it have to be. The power on option can probably be demonstrated with a "zero anti-torque" setting.
Read this download about a 900 in Japan."
RVDT- It is really not possible to truely demonstrate a fan failure as minimum fan pitch in all three models is still a signifigant amount of airflow. The the thruster is open straight down or up to give you no thrust from the thruster. This will give you good COANDA effect and some anti-tq when the acft slows. The other control, the VSCS or vertical stabilizers will have some angle of incidence. With a true fan failure you would be able to hold full left pedal in a 500/600 and have anti-tq to quite a low airspeed. If I was an engineer, I would have a switch in the 902 that would allow a pilot to set any of three set angles on the VSCS for emergency. Could be nice for either stuck thruster or failed fan.
The Japan accident was very interesting. The pilot flew that acft for over an hour before attempting to land. He had good control until he performed a fairly tight turn to final and slowed the airspeed to a very slow forward speed and a slight climb. At that point the acft started to spin and it was "Mister Toad's Wild Ride" from 200 feet AGL. If you ever get a chance to see that video, it will open your eyes for sure. The structure of the acft saved those two guys bacon for sure.