Accident MBB BK 117A-3 N913EF,
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ASN Wikibase Occurrence # 76079
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Date:Thursday 22 June 2006
Type:Silhouette image of generic BK17 model; specific model in this crash may look slightly different    
MBB BK 117A-3
Owner/operator:CJ Systems Aviation Group
Registration: N913EF
MSN: 7032
Year of manufacture:1985
Total airframe hrs:8882 hours
Engine model:Lycoming LTS101-650-B1
Fatalities:Fatalities: 0 / Occupants: 3
Aircraft damage: Substantial
Location:Ponce de Leon, FL -   United States of America
Phase: Approach
Departure airport:Bonifay, FL (02FD)
Destination airport:Prosperity, FL
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
The commercial certificated pilot was transporting two medical crewmembers under Title 14, CFR Part 91, to a prearranged landing site to meet ambulance and fire department personnel caring for a patient. The flight was conducted during dark night conditions. The accident helicopter had predetermined landing site locations stored in its onboard GPS navigation system. The stored landing sites had been previously inspected for obstruction clearance and overall suitability. After arriving overhead of what he thought was a sod-covered field, the pilot used an externally mounted searchlight to aid in seeing the ground and obstructions during the landing approach. As the helicopter approached the open field and transitioned from forward flight to a hover, the pilot encountered blowing, dry sand and dust created by the helicopter's main rotor downwash, which reduced his visibility. He stated he lost all visual reference with the surface of the field, and while attempting to regain a visual reference, the helicopter's main rotor struck a large tree, and the fuselage began to rotate. The helicopter's tail boom assembly subsequently struck the tree, and the helicopter impacted terrain. The helicopter sustained substantial damage to the main rotor drive system, tail boom assembly, and fuselage. A postaccident inspection of the landing site disclosed that the sod had recently been removed from the field, leaving a dry, sand-covered field. The pilot reported that there were no preaccident mechanical anomalies with the helicopter.

Probable Cause: The pilot's failure to maintain clearance from objects while hovering in ground effect, which resulted in an in-flight collision with a tree. Factors associated with the accident were loose, sand-covered terrain, and the operator's failure to ensure that the pilot was provided with current, off-airport landing site condition information.

Accident investigation:
Investigating agency: NTSB
Report number: ANC06LA073
Status: Investigation completed
Download report: Final report




Revision history:

07-Aug-2010 03:23 Alpine Flight Added
19-Aug-2010 11:02 TB Updated [Aircraft type]
27-Nov-2013 10:47 TB Updated [Phase, Source, Damage, Narrative]
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
05-Dec-2017 09:12 ASN Update Bot Updated [Operator, Other fatalities, Nature, Departure airport, Source, Narrative]

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