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ASN Wikibase Occurrence # 42579
Last updated: 27 December 2019
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Date:21-FEB-1999
Time:15:10
Type:Silhouette image of generic UH1 model; specific model in this crash may look slightly different
Bell UH-1H
Owner/operator:Avag Inc
Registration: N6258Z
C/n / msn: 68-16089
Fatalities:Fatalities: 1 / Occupants: 1
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:Glenn, CA -   United States of America
Phase: Unknown
Nature:Agricultural
Departure airport:
Destination airport:
Investigating agency: NTSB
Narrative:
The helicopter was in the process of finishing an aerial application run over an almond orchard when it collided with the ground in a nose down attitude. The pilot told the company owner and his family members that the flight controls 'went away' and he could not overpower the flight controls as the helicopter descended. The owner of the helicopter company stated that during the spray run the pilot flew up and over a powerline which was approximately 100 feet from the orchard. He reported that the pilot told him he heard a noise as he flew over the powerlines and then experienced the loss of control. Detailed examination and functional tests of various components of the helicopter's control systems failed to find any evidence of preimpact failure or malfunction. The tail stinger of the helicopter and an exemplar sample of the copper powerline wire was examined in a laboratory and it was determined that there was no wire transfer marks on the tail stinger. The pilot was transported to a hospital after the accident where tests later determined he had fractured his back. He died during a surgical procedure 2 days after the accident. The pilot held an airline transport certificate with over 32,000 hours of flight time, 28,000 of which were in helicopters.
Probable Cause: An inflight loss of control for undetermined reasons.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001205X00193&key=1


Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
21-Dec-2016 19:24 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
26-Nov-2017 10:01 ASN Update Bot Updated [Source, Narrative]

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