| Crash location | 41.399722°N, 88.793889°W |
| Nearest city | Ottawa, IL
41.348367°N, 88.880633°W 5.7 miles away |
| Tail number | N31138 |
|---|---|
| Accident date | 04 Jul 2008 |
| Aircraft type | Robinson R44 II |
| Additional details: | None |
The helicopter impacted unmarked power transmission lines as the pilot maneuvered at low altitude over a river. The helicopter impacted the river and separated into several pieces. The pilot and his passengers were not injured and were rescued by nearby boaters.
The pilot's failure to maintain clearance from the power transmission lines. Contributing to the accident was the unmarked power transmission lines.