# Accident 20070603008169A: Bolkms BO105S, Concord, CA, June 3, 2007

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: June 3, 2007, 15:40 local time
- Place: Concord, CA
- Damage: Substantial damage
- Phase of flight: Hovering
- Operating rules: Air taxi and commuter (Part 135)
- Operator: STRA
- Location: 37.9992° N, 122.0300° W: From the FAA
- Nearby events: https://openairdocs.org/map.md?lat=37.9992&lon=-122.0300&mi=10
- Aircraft: N623MB (not matched to a registry record)
- Reported make and model: BOLKMS BO105S
- Reported engine: ALLSN 250C20B
- People aboard: 3
- Fatal injuries: 0
- Pilot flight hours: 7,700 total, 1,700 in this make and model, 20 in the last 90 days
- NTSB investigation: [NTSB SEA07CA143](https://openairdocs.org/ntsb/SEA07CA143) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20070603008169A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

(-23) CALSTAR 1 WAS REQUESTED BY ORINDA FIRE DEPARTMENT TO RESPOND TO A BICYCLE ACCIDENT AT BRIONES PARK, APPROXIMATELY 5 MILES SOUTH OF CONCORD AIRPORT (CCR). THE LANDING SPOT CHOSEN WAS ON TOP OF A RIDGELINE WITH A TREE ON THE SW SIDE AND ANOTHER TREE ON THE NE SIDE. AS THE PILOT CAME TO A HOVER OVER THE CHOSEN LANDING SPOT, HE BEGAN A LEFT TURN TO "SQUARE UP" THE AIRCRAFT AND AT THAT POINT, HEARD A DISCERNABLE NOISE CHANGE IN THE ROTOR SYSTEM. AFTER LANDING AND NORMAL SHUTDOWN, A QUICK INSPECTION REVEALED OUTBOARD TRAILING EDGE DAMAGE TO 3 OF THE FOUR MAIN ROTOR BLADES. EXAMINATION OF THE NE TREE REVEALED A BROKEN BRANCH INDICATING CONTACT WITH THE ROTOR BLADES.

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB SEA07CA143](https://openairdocs.org/ntsb/SEA07CA143), Jun 3, 2007: Calstar 1 Eurocopter BO-105S (N623MB), Concord, CA, substantial damage. Probable cause: The pilot's failure to maintain clearance from an object during hover. Trees were a factor.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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