ASN Wikibase Occurrence # 158028
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| Date: | Monday 5 August 2013 |
| Time: | 09:15 |
| Type: |  Hughes 369D |
| Owner/operator: | Haverfield Aviation |
| Registration: | N8688F |
| MSN: | 1070208D |
| Year of manufacture: | 1977 |
| Total airframe hrs: | 6273 hours |
| Engine model: | Rolls Royce M250-C20B |
| Fatalities: | Fatalities: 2 / Occupants: 3 |
| Aircraft damage: | None |
| Category: | Accident |
| Location: | 36 miles NE of Midland, TX -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Cargo |
| Departure airport: | Ackerly, TX |
| Ackerly, TX | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter was being used to hoist linemen onto a power transmission line tower. Two linemen were suspended beneath the helicopter on a 100-foot-long external cargo line (long-line). Shortly after departure, as the helicopter was climbing, the long-line collided with a shield wire that was suspended between two towers. The operator reported that the long-line severed about 5 feet above the linemen, who fell about 200 feet to the ground. The pilot returned to the landing zone and made an uneventful landing. The operator reported that there were no preexisting mechanical malfunctions or failures with the helicopter that would have prevented normal operation.
The pilot stated that the shield wire had not been identified or discussed during the preflight briefing. He reported that the clear sky condition and the morning light made the shield wire impossible to see from the ground. Additionally, he stated that it was uncommon for the shield wire, the uppermost wire on a power transmission line, to be installed before the lower conductor wires had been installed.
Probable Cause: The pilot’s failure to identify and maintain adequate clearance from a shield wire that was suspended between power transmission line towers.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 06-Aug-2013 02:08 | Mxcollins | Added |
| 06-Aug-2013 02:09 | harro | Updated [Aircraft type, Operator, Location, Damage] |
| 06-Aug-2013 16:28 | Geno | Updated [Time, Aircraft type, Registration, Cn, Source] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 29-Nov-2017 09:01 | ASN Update Bot | Updated [Operator, Total fatalities, Total occupants, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
| 03-Mar-2024 16:59 | ASN | Updated [Departure airport, Destination airport] |
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