Wirestrike Accident MBB BK 117B-1 N220HH,
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ASN Wikibase Occurrence # 201964
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Date:Saturday 13 February 1999
Time:17:45 LT
Type:Silhouette image of generic BK17 model; specific model in this crash may look slightly different    
MBB BK 117B-1
Owner/operator:Hermann Hospital Life Flight
Registration: N220HH
MSN: 7215
Year of manufacture:1989
Total airframe hrs:6348 hours
Engine model:Lycoming LTS-101-B-1
Fatalities:Fatalities: 0 / Occupants: 5
Aircraft damage: Substantial
Location:Hockley, TX -   United States of America
Phase: Initial climb
Departure airport:
Destination airport:Houston, TX (20TA)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
The helicopter impacted power lines while departing from an automobile accident scene. The helicopter was part of a two aircraft team dispatched to the scene of the automobile accident. During the landing approach, the pilot noticed the power lines running parallel to the road; however, he did not consider them to be an unusual hazard at the time. After the passengers were loaded into the helicopter, the pilot took off, drifted toward the wires, and impacted the power lines. The pilot then landed the helicopter in an adjacent field. The pilot stated that at the time the helicopter impacted the wires 'the sun was shining directly into the aircraft' and that 'trash was blowing around.' Another helicopter was dispatched to the scene of the accident to transport the patients to the hospital.

Probable Cause: The pilot's failure to maintain clearance with the power lines. A factor was the sunglare reducing the pilot's visibility.

Accident investigation:
Investigating agency: NTSB
Report number: FTW99LA080
Status: Investigation completed
Duration: 2 years and 2 months
Download report: Final report




Revision history:

26-Nov-2017 10:00 ASN Update Bot Added
08-Apr-2024 09:44 ASN Update Bot Updated [Time, Operator, Other fatalities, Phase, Source, Narrative, Category, Accident report]

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