It's burning in rugged, isolated bushland in New England National Park approximately 22km south west of Bellingen after being started by a lightning strike on Monday evening.

An RFS Mid North Coast community newsletter issued at 5.45pm today said a large air tanker laid a retardant line in front of the fire this afternoon.

Earlier in the day their bulletin said that a National Parks & Wildlife remote area firefighting crew was on standby to winch into the area if it was safe to do so and that water bombing, which had to be halted yesterday due to strong winds, would recommence when conditions permitted.

"Weather conditions over the next four days are expected to assist firefighters to continue mopping up the Liberation Trail fire and to directly attack the new fires," the RFS said.