An ATR training captain @flywithmagnar wrote about this report:
“As an ATR pilot and instructor for more than 20 years, I find it unbelievable that this could happen. Even so, the pilots had several opportunities to rectify the error. When a propeller goes into feather, it produces a distinct sound. When the flaps is extending, the aircraft pitches up, and the pilot has to push the nose down and trim the aircraft. The single chime from the Crew Alert System was most likely triggered when the AC “Wild” generators driven by the propeller gearboxes went offline. As a consequence, hydraulic pumps and ice protection systems were disabled as well. When reading the Before Landing checklist, the pilots are supposed to check the position of the flap lever and the indicator. But what really puzzles me, is that the flaps was extended to 30 degrees after the checklist had been completed. Was this communicated to the other pilot? The preliminary report doesn’t tell much about what was said in the cockpit. And there might be factors we are still not aware of. The investigation will definitely focus on human factors.”