The Helicopter Line/Harris Mountains Heli-Ski Squirrel helicopter crashed as it came in to land on Mt Alta's steep slopes, about 25km from Wanaka, on August 16.
Auckland man Jerome Box (52) was killed and seven others, including the pilot and heli-ski guide, were injured.
The Transport Accident Investigation Commission is already investigating.
In this Thursday's Mountain Scene, CAA spokesman Mike Richards confirmed a separate Health and Safety in Employment Act investigation had been launched into the accident.
However, he would not confirm details, such as what prompted the inquiry or if other incidents were included in its scope.
''We cannot make any further comment until the investigation is completed.''
In 2011, Skyline Enterprises bought Totally Tourism - which included brands Helicopter Line and Harris Mountains Heli-Ski.
In October last year, a pilot was seriously injured after his chopper clipped another and crashed on to its side near the Tyndall Glacier, in Mt Aspiring National Park. Both the helicopters and pilots were from The Helicopter Line.
Then, in January, a Helicopter Line machine tipped over in deep snow on the Richardson Glacier, near Mt Cook, but that did not spark an investigation.
Former Totally Tourism owner Mark Quickfall was appointed to Skyline's board in 2012 and, in April of this year, he became chairman.
Mr Quickfall said a health and safety investigation was appropriate for the Mt Alta crash.
''We're as keen as anyone to find out if there are any failures in our systems.''
An internal review had led to small tweaks, including the appointment of an experienced pilot.
But Mr Quickfall said the firm's internal report had not found anything ''glaringly obvious'' in its procedures which might have led to the crash.
The company had ''pretty strong ideas'' about what caused the crash but he would not disclose them before the official findings were released.
Pilot Dave Matthews and guide Mark Sedon were recovering, but were not back flying, he said.
