"Seems incredible an S76 can cut such a swath through the trees."
Just my opinion but I think that you will find that the "swath through the trees" is actually a bulldozer track cut to the actual impact site.
Just FYI about the airport
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The Moosonee Airport is located 3 kilometres northwest of the Town of Moosonee and occupies a land area of approximately 212 hectares. The airport serves as a point of call for air carriers offering scheduled passenger service; and services both private and commercial helicopter and fixed-wing aircraft operators located on site.
This airport is owned and operated by The Corporation of the Town of Moosonee. The Airport Certificate is held on behalf of the town by the Airport Manager; and is maintained in the Airport Manager's office at Moosonee Airport.
Moosonee Airport is operational 24 hours per day, 7 days per week; and is capable of supporting both VFR and IFR operations. The critical aircraft for the primary runway is the HS748.
The manoeuvring area consists of two intersecting runways two taxiways, and a public apron. The primary runway (06-24) is 3999 feet long by 100 feet wide asphalt. The secondary runway (14-32) is 3500 feet (approximately half paved and half gravel) by 100 feet wide.
Moosonee Airport has operational staff on site 10 hours per day, Monday to Friday, excluding statutory holidays. Normal working hours are 7:00 am to 5:00 pm local time Monday to Friday.
NavCanada maintains a Flight Service Station (FSS) located at the Timmins Airport, operating 07:00 - 21:00 - 7 days per week. As part of the Letter of Agreement with NavCanada, FSS personnel refer requests for authorization to the Airport Manager or his designate if there is any requirement for special procedures or conditions on the airport. FSS authorities and/or procedures are also identified in the Emergency Response Plan.
Call-out procedures have been established for services outside of regular working hours. A call out list has been established and posted with the Flight Service Station. The maintenance person on duty has been delegated all necessary authorities to act on behalf of the Airport Manager in his/her absence.