Pilot critical after Qld light plane crash

A pilot is in a critical condition following a light plane crash at Caloundra Airport on Queensland's Sunshine Coast.

The plane, with three men and a woman on board, stalled and flipped on the runway as it landed just before midday on Saturday, emergency services said.

Two people, the pilot and one of the male passengers, were trapped in wreckage and had to be freed by emergency crews.

It took 70 minutes to extract the first person and "considerably longer" for the second, Queensland Ambulance Service spokeswoman Kristy McAlister said.

The pilot was airlifted to Royal Brisbane and Women's Hospital while the passengers were transported to Sunshine Coast University Hospital.

The pilot had "multi-trauma injuries" including significant lower limb, chest and head injuries, Ms McAlister said.

He was in a critical condition on Saturday evening, a hospital spokeswoman told AAP.

The other trapped passenger had "significant lower limb injuries". The two passengers who freed themselves suffered minor injuries only.

Those three were in a stable condition on the Sunshine Coast.

The forensic crash unit is investigating.