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ASN Wikibase Occurrence # 247105
Last updated: 25 November 2021
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Date:22-JAN-2021
Time:14:00 LT
Type:Silhouette image of generic MD60 model; specific model in this crash may look slightly different
McDonnell Douglas MD 600N
Owner/operator:Brim Equipment Leasing LLC
Registration: N60BK
MSN: RN028
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Mankato, MN -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:External load operation
Departure airport:Crystal Lake, MN
Destination airport:Mankato, MN
Investigating agency: NTSB
Narrative:
The pilot reported he had completed one line-pull in the helicopter and had gone back to the landing zone to refuel. After refueling, the pilot flew to the puller machine that was now at another structure. The rope was hooked up by the linemen as normal, but the hydraulic fluid had frozen on the puller machine and it was inoperative. The line was then unhooked by the linemen and the pilot was waved off. The pilot returned to the landing zone to wait for the puller machine to be repaired. After several minutes, the pilot heard the puller operator radio that the machine was operational, and he took off to head back to the structure. He received a
second radio call that the machine was not ready, and the pilot turned and started back to the landing zone again.
The pilot was concerned that the helicopter would need to be refueled again since pulls typically take about an hour. While flying parallel to the power lines and descending for landing at the fuel truck, he looked at the instrument panel timer to determine the fuel burned.
As he looked back outside the helicopter, he saw the middle phase straw line and then felt the main rotor blades impact the straw line about 150 ft agl. The pilot reported the straw line is a 3/8-inch steel wire that is somewhat rusted and difficult to see in most lighting conditions. The pilot then landed near the fuel truck uneventfully. Three of the six main rotor blades were substantially damaged. The pilot reported there were no preaccident mechanical malfunctions or failures with the helicopter that would have precluded normal operation.
Probable Cause and Findings
The pilotís loss of situational awareness while landing, resulting in an impact with power lines.

Sources:

FAA
https://www.merriam-webster.com/dictionary/straw%20line

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration: 5 months
Download report: Final report
Location


Revision history:

Date/timeContributorUpdates
26-Jan-2021 19:40 harro Added
27-Jan-2021 07:52 Aerossurance Updated [Source, Narrative]
18-Jul-2021 19:38 harro Updated [Time, Phase, Nature, Departure airport, Destination airport, Narrative, Category, Accident report]

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