What happened
On September 1, 2010, a Eurocopter AS3/350 B-2 helicopter, registered C-GHVD, was performing a visual flight rules (VFR) mission for Canadian Helicopters Limited. The flight was transporting workers to and from a work site near Chibougamau, Quebec. After completing morning tasks, the pilot departed the work site at 15:29 EDT for a return flight to the company base.
As the aircraft approached its destination, it encountered a line of thunderstorms and heavy rain. The pilot attempted to deviate from the direct route to perform a precautionary landing in a blueberry field near a gravel road. During the final approach, at approximately 70 feet above the ground, the pilot lost all visual reference to the terrain due to the intense precipitation. The helicopter struck trees and the ground, coming to rest on its side. The pilot and one passenger sustained serious injuries, while the two rear passengers suffered minor injuries.
The investigation
The investigation examined the aircraft's maintenance records, the pilot's experience, and the meteorological conditions. The Eurocopter AS350 B-2 was found to be properly maintained and within weight limits. Investigators noted the aircraft lacked windshield wipers, which could have been beneficial during low-speed flight in heavy rain.
Meteorological analysis revealed that a cold front and thunderstorms moved through the area faster than predicted by earlier forecasts. While a SIGMET had been issued for the region, the pilot had not sought a weather update via satellite phone or internet during the afternoon, despite opportunities to do so during refueling. The investigation also reviewed the company's safety protocols and the passenger safety briefings, which were credited with enabling a rapid emergency response.
Findings
- The pilot's decision to deviate from the flight path and land was made too late to avoid the deteriorating weather.
- The pilot lost visual contact with the ground due to heavy rain while maneuvering at low speed during the approach.
- The pilot did not obtain a weather update during the afternoon, which would have provided information regarding the approaching thunderstorms.
- The heavy precipitation accumulated on the windshield, further restricting visibility because the aircraft was not equipped with wipers.
- The passengers' use of survival equipment and the satellite phone allowed for the rapid notification of the company and emergency services.