A helicopter pilot who crashed in the Westland National Park on Saturday morning is now in a serious but stable condition.

The Civil Aviation Authority will send safety investigators to the scene of the wreckage today, to make a preliminary assessment.

After a problem taking off, the 24-year-old pilot crashed on Poerua Glacier on the West Coast.

The pilot was trapped in the cockpit before being taken to Christchurch Hospital.

Two hunters onboard suffered minor injuries.

The CAA will interview all three witnesses this week.

More details are expected on Thursday.