Two people have walked away alive after their helicopter plummeted to the ground and was significantly damaged on Thursday.

Emergency responders rushed to the crash scene at Bankstown in Sydney’s south-west just before 2pm.

They were confronted by the bent remains of a single-engine helicopter on the ground at Bankstown Aerodrome in Airport Avenue.

The propeller and part of the fuselage sustained significant damage as the chopper came to rest on its side.

Miraculously both occupants, believed to be a pilot and an instructor, were not injured and managed to walk from the wreckage.

They were treated by NSW Ambulance paramedics.

The single-engine chopper was on its side. Photo: FRNSW

Fire and Rescue NSW deployed 10 firefighters and three fire trucks.

Fire crews, trained in hazardous materials response, cleared a minor fuel spill.

They also suppressed fibres from the wreckage, which posed a potential health risk.

NSW Police will investigate the circumstances surrounding the crash.