ASN Wikibase Occurrence # 241080
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| Date: | Thursday 1 August 2019 |
| Time: | 18:39 |
| Type: |  Airbus Helicopters H145 |
| Owner/operator: | Rega Schweizerische Luft-Ambulanz AG |
| Registration: | HB-ZQM |
| MSN: | 20247 |
| Year of manufacture: | 2019 |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | Walzenhausen -
 Switzerland
|
| Phase: | Landing |
| Nature: | Ambulance |
| Departure airport: | Rega Base St. Gallen |
| Walzenhausen | |
| Investigating agency: | STSB |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
The helicopter suffered a wire strike while landing on an HEMS flight.
Telephone lines, which often run parallel to roads to facilitate maintenance work on the line, do not usually reach a height of 25 m above ground. Therefore, such lines are not registered in the official and generally accessible database of aviation obstacles. In this case, the flight operating company had an extended database which displayed the affected telephone line in the EFB and on the navigation screen in the cockpit.
By means of these aids, the crew registered already during the overflight to the operation site that there were telephone lines in the area of the landing field, which improved their situational awareness. The telephone line, with which the helicopter later collided, was already recognized by the crew during the first approach to the first landing site. However, the pilot wrongly judged the course of the cable to be diagonal across the meadow behind it. Against this background it becomes understandable why the pilot did not pay enough attention to the telephone cable during the later approach to the second landing field.
Due to the position of the sun, which was in the front right as seen in the direction of flight of the helicopter and in the area of the landscape horizon, it is also conceivable that the pilot was blinded by the sunlight. The already poor visibility of such thin cables may have been further aggravated.
Accident investigation:
 |
|
Sources:
STSB
http://aerossurance.com/helicopters/telephone-hems-wirestrike/
Media:
A confined HEMS landing site, a backlit but identified low wire, a misdiagnosed routing and mitigating a FOD threat all added to the complexity in this landing.https://t.co/joXUW4DC9q #airambulance #helicopter #accident #flightsafety #aviationsafety pic.twitter.com/fa3fBuANdg
— Aerossurance (@Aerossurance) September 20, 2020
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 09-Sep-2020 07:10 | harro | Added |
| 09-Sep-2020 07:11 | harro | Updated [Narrative, Accident report, ] |
| 20-Sep-2020 10:29 | Aerossurance | Updated [Aircraft type, Operator, Departure airport, Source, Narrative] |
| 20-Sep-2020 10:41 | Aerossurance | Updated [Embed code] |
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