# NTSB ENG11WA038: Aerospatiale AS350, Big Trout Lake, Ontario, Canada, May 27, 2011

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Foreign investigation
- Date: May 27, 2011
- Place: Big Trout Lake, Ontario, Canada
- Highest injury: No injuries
- Status: Led by another country's authority
- NTSB office: Aviation Engineering Division
- Lead agency: Other
- Parties: FAA, LAACO, Honeywell
- NTSB case key (mKey): 81113
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ENG11WA038
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/81113/pdf
- Page: https://openairdocs.org/ntsb/ENG11WA038

## Factual narrative

An Expedition Helicopters Aerospatiale AS 350 B-2, registration C-GSSS, powered by a Honeywell LTS-101-700-D engine, was substantially damaged during an emergency autorotation landing following an in-flight engine shutdown. According to the Transportation Safety Board of Canada,the helicopter was transporting a drilling crew from a base camp about 80 miles east of Big Trout Lake, Ontario, to a drill site, when, while in cruise flight, an uncommanded left yaw was experienced. The pilot performed an autorotation and the helicopter landed hard in shallow water near the shore of a lake. The helicopter was substantially damaged, but all occupants exited the helicopter safely and waded to shore. The Transportation Safety Board of Canada is investigating this event. For further information, contact: Mr. Ross Penden, Investigator-In-Charge Transportation Safety Board of Canada Tele: +1-204-983-2847; Mobile +1-204 771-6999 Email: ross.peden@tsb.gc.ca This report is for informational purposes and contains only information obtained for or released by the TSB.

## Aircraft

- Registration: C-GSSS (not matched to a registry record)
- Reported make and model: AEROSPATIALE AS350 (B2)
- Serial number: 2983
- Engines: LYCOMING LTS101 turbo shaft
- Damage: Substantial damage
- Flight: Non-U.S., commercial
- Operator: Expedition Helicopters
- Airworthiness certificate: Standard, Transport

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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