What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Narrative: during spool down of rotor blades, the pilot noticed a whistle noise and proceeded to investigate. During post flight he found de-lamination of trailing edge of rotor blades. During setting of last power line pole, the blades must have brushed the top of a tree enough to create a flutter against the trailing edge of the blades. No other damage or injury was sustained. This report is final and closed.
As the FAA filed it
NARRATIVE: DURING SPOOL DOWN OF ROTOR BLADES, THE PILOT NOTICED A WHISTLE NOISE AND PROCEEDED TO INVESTIGATE. DURING POST FLIGHT HE FOUND DE-LAMINATION OF TRAILING EDGE OF ROTOR BLADES. DURING SETTING OF LAST POWER LINE POLE, THE BLADES MUST HAVE BRUSHED THE TOP OF A TREE ENOUGH TO CREATE A FLUTTER AGAINST THE TRAILING EDGE OF THE BLADES. NO OTHER DAMAGE OR INJURY WAS SUSTAINED. THIS REPORT IS FINAL AND CLOSED.