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A HELICOPTER pilot has been rescued after his chopper crashed while he was fighting a bushfire in Tasmania.

A Tasmanian police rescue helicopter evacuated the pilot at 5pm (AEDT) after his helicopter crashed while he was fighting the fire near Molesworth in the state's south, police said.

The pilot was flown from the scene and taken to hospital in a stable condition.

The cause of the crash is unknown at this time.

The Tasmanian Fire Service (TFS) says the fire danger in the Molesworth area is very high with a large bushfire burning at Glen Dhu Road.

The fire is impacting the areas of Suhrs Road, Fehlbergs Road, Valley Road and Collins Cap Road to Springdale Road, it says in a statement.

TFS warns it is likely to be too late to leave the area, with residents advised to activate their bushfire survival plan.

Spot fires may threaten homes earlier than the main fire front.

The TFS says there may be embers, smoke and ash falling on Molesworth, Glenlusk and Collinsvale, Myrtle Forest Road, and Old Springdale Road.

TFS said an out-of-control fire on the Huon Highway at Franklin, south of Hobart, has prompted a high fire danger rating for the area.

TFS says the fire may now affect the Huon Highway, Castle Forbes Road and Fleurtys Road to the south of Franklin.

Communities south of Franklin and Castle Forbes Bay may experience embers, smoke and ash falling on them.

A low-moderate fire danger rating has also been made for the Lefroy area, between Bridport and George Town on the north coast, with a large bushfire burning out of control at Shaw Street.

The fire may affect the communities of the Lefroy township and properties southeast of Lefroy are also at risk from smoke and embers, the TFS said.

The 52-year-old Hobart man crashed into a clearing near the bushfire before being rescued.

His helicopter was one of a team of four choppers water-bombing the Molesworth blaze that started on February 6.

Police said the man was airlifted to the Royal Hobart Hospital for assessment and was shaken by the incident but not seriously hurt.

The Air Transport Safety Bureau has been advised of the crash. Investigators will look into the cause of the accident.

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EXPERTS are trying to determine what caused a helicopter to crash while battling a bushfire near Collinsvale.

Tasmania Police officers today walked to the scene of the crash to examine the badly damaged machine.

Air crash investigators will conduct a mechanical investigation but access to the stricken chopper has been hampered by fires burning nearby.

The helicopter was water bombing a home near paddocks behind Collinsvale, north-west of Hobart, late yesterday afternoon when the pilot was forced to make an emergency landing because of a sudden mechanical failure.

The Tasmania Fire Service says the pilot was badly shaken but walked away without injury.

The loss of the helicopter was a major blow for the 38 crews on duty last night, battling to save Molesworth and Collinsvale homes.

The TFS says a drop in wind speed and temperature, coupled with a small amount of rain, has improved the situation today and so far no homes have been lost.

The fire has ripped through more than 1000ha of land and evacuated residents are being asked to stay away from the area until further notice.

Glen Dhu Rd and Collins Cap Rd remain closed, with pastures scorched, fences destroyed and power poles still smouldering.

Speaking at Molesworth today, TFS district officer Mark Klop said the main fire front was burning in the cliffs behind Glen Dhu Rd.

The rugged terrain was making it very difficult to put in more containment lines.

"We've got two dozers working to build fire breaks at the moment but the helicopters have proved invaluable to us fighting this fire," he said.

"We can't get ground crews or dozers into most of the areas where the fires have been burning, so without the aircraft the situation would've been very different."

The TFS has three helicopters water bombing and conducting fly-overs to map the fire today.

Mr Klop said homes would have been lost without the aerial presence.

"They've certainly protected a lot of homes and they've also kept our ground crews safe," Mr Klop said.

"Something flares up, we tell them, and they come in and bomb it until the danger passes and we're right. They're doing an excellent job."

A "watch and act" alert is in place for residents of the fire-affected areas, with regular updates available on the TFS website.

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