ASN Wikibase Occurrence # 247338
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| Date: | Monday 11 March 2019 |
| Time: | |
| Type: |  Eurocopter AS 350B3 Ecureuil |
| Owner/operator: | Air-Glaciers |
| Registration: | HB-ZCZ |
| MSN: | 3434 |
| Year of manufacture: | 2001 |
| Fatalities: | Fatalities: 0 / Occupants: |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Barrage de Tseuzier, 5 km nord-ouest de Crans-Montana -
 Switzerland
|
| Phase: | Approach |
| Nature: | Passenger - Non-Scheduled/charter/Air Taxi |
| Departure airport: | Sion Airport (SIR/LSGS) |
| Barrage de Tseuzier | |
| Investigating agency: | STSB |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
The mission of this flight was to bring three workers to a dam for inspection work that was carried out once a month.
After the takeoff from the airport of Sion (LSGS), the reduced visibility conditions forced the pilot to undertake an approach by the left bank of the dam. Without carrying out a reconnaissance flight before the approach, the pilot intended to fly over the power line he knew, then to carry out the final approach along the wall of the dam. Shortly before reaching the dam, the pilot was surprised by the power line.
As the pilot later stated, he knew the line well, but he estimated his position a little further north and at a lower altitude in the valley.
The pilot noticed that the helicopter touched the power line. The pilot did not notice any vibration or an overshoot of the engine parameters; he continued his approach and landed the helicopter without problem on the planned landing zone. As the meteorological conditions deteriorated the pilot did not carry out a complete stop of the helicopter but only an engine idle.
After a 5 minutes flight back to base, damage on the leading edge of a blade of the main rotor was found. No other parts of the helicopter were affected.
Accident investigation:
 |
|
Sources:
STSB
http://aerossurance.com/helicopters/wire-strike-dam-approach/
Media:
Wire Strike: Weather forced an unfamiliar approach direction to a familiar site. The lack of a site recce first increased risk as did the inaudibility of an obstacle warning system.https://t.co/MzfS6f4bdp #helicopter #accident #flightsafety #aviationsafety pic.twitter.com/5XpRNN7mRK
— Aerossurance (@Aerossurance) March 6, 2021
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 01-Feb-2021 10:11 | harro | Added |
| 01-Feb-2021 10:15 | harro | Updated [Source, Category] |
| 05-Mar-2021 19:57 | Aerossurance | Updated [Source] |
| 06-Mar-2021 09:47 | Aerossurance | Updated [Embed code] |
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