Kegworth
The cause was a fan blade fracture leading to air conditioning smoke due to engine damage.
The crew failed to notice the vib gauge which would have identified the damaged engine.
The smoke cleared when thrust was reduced on the damaged engine leading to confirmation bias having already shut down the undamaged engine.
They did not have a fire warning until on final, 36 seconds before initial impact.
The cabin crew did not give the flight deck crew incorrect information.