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ASN Wikibase Occurrence # 43267
Last updated: 14 June 2020
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Date:02-JUN-1998
Time:16:10
Type:Silhouette image of generic H500 model; specific model in this crash may look slightly different
McDonnell Douglas MD530F (369FF)
Owner/operator:Winco
Registration: N16031
C/n / msn: 0052FF
Fatalities:Fatalities: 1 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Shoshone, ID -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Unknown
Departure airport:Gooding, ID (GNG)
Destination airport:
Investigating agency: NTSB
Narrative:
Witnesses reported that the helicopter had just released from positioning a fiber optic cable on top of a power pole. An external line is hung over the left landing skid, forward of the front leg, and a shoe is used to cradle the cable to lift and position it in place for permanent attachment. A lineman was on the pole and in the process of permanently attaching the cable to the pole when the pilot maneuvered the helicopter away and behind the lineman about five feet. Another lineman was standing on the left side landing skid and was then going to install vibration dampers on the cable. The lineman on the pole stated that everything was normal when he heard what sounded like a clicking sound or a sound like a card in a spoked wheel. The lineman on the pole stated that he knew that the helicopter was in the wires and saw pieces of the helicopter flying. The lineman ducked down on the pole, and when he looked up again, the helicopter had already gone through the transmission wires and was laying on its right side on the ground. Impact signatures of a cable strike were found on both tailrotor blades. The cable that the helicopter was positioned next to was severed. Further inspection of the severed cable noted that 19 of the 22 strands that make up the fiber optic cable received varying amounts of mechanical damage prior to failure. During the post-crash wreckage documentation and inspection, no evidence was found to indicate a mechanical failure or malfunction. CAUSE: Failure to maintain clearance from wires. A transmission wire was a factor.

Sources:

NTSB: http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001211X10412


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]

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