SA bushfire burning out of control

An out of control bushfire on South Australia's Fleurieu Peninsula is believed to have been started by an angle grinder.

The Country Fire Service on Monday made 71 aerial water drops on the 280-hectare fire near Mt Terrible Road and Louds Hill Road which was travelling in a westerly direction towards Sellicks Hill.

By Monday evening the fire had shifted northwest towards Plains Road, Chaff Mill Road, Culley Road and Rogers Road.

"Check your Bushfire Survival Plan and prepare for a bushfire in your area," a CFS spokeswoman said.

"If your plan is to leave or you are not prepared, leave now. Only leave if the path is clear to a safe place. Well prepared and actively defended homes can offer safety."

A CFS spokeswoman said the fire is believed to have been started by an angle grinder.

The uncontrolled fire is burning in scrub and conditions are continually changing.

A CFS spokesman said the largely inaccessible fire had a perimeter of 6.7km and a large amount of smoke was restricting visibility.

While no properties were currently under threat, the Bushfire Watch and Act alert remained in place.

Residents are being urged to check their bushfire survival plan, and the CFS says people should only leave if the path is clear to a safe place.