The aeroplane has crashed, and some are speculating over an apparent feathered prop/blade amongst the wreckage.
From that, I guess you could say it must of caught fire on the way down. Well just look at that burnt fuselage...
Apologise for upsetting you.
All in PNG are waiting to find what happened and I guess look for evidence from the crash site.
A propellor in feather does indicate something other than operating normally at time of accident.
BH