The Civil Aviation Authority has launched a separate health and safety inquiry into last month's Mt Alta helicopter crash.
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.