A Canadian Lancaster, currently on a UK tour, performed an engine shutdown during a flight in County Durham.
Its owners said it landed safely at Durham Tees Valley airport following the "precautionary" shutdown.
It had been due to fly to Bournemouth to take part in weekend displays with an RAF Lancaster bomber.
An airport spokesman said the plane had experienced an "issue" with one of its engines as it was approaching the runway at the end of a 30-minute demonstration flight for invited guests.
"The aircraft landed safely and nobody was injured and it taxied to stand.
"The Lancaster has been returned to the hangar and engineers are conducting tests to determine the cause of the fault," he added.
The last remaining flying Lancasters - owned by the RAF Battle of Britain Memorial Flight and the Canadian Warplane Heritage Museum - were due to fly at the Bournemouth Air Festival as well as the Shoreham Air Show and the Gedling Show in Nottinghamshire, as part of a two-month UK tour by the Canadian aircraft.
The aircraft are based at RAF Coningsby in Lincolnshire for the duration of the visit.
There were over 7,000 of the type of aircraft produced between 1941 and 1946.
A statement from Bournemouth Air Festival said: "We share the disappointment of all the Canadian Lancaster fans but we understand that she is over 70 years old and these sort of things can and do happen.
"We hope she's airworthy again soon."
An airworthy Merlin engine is being shipped from the Lincolnshire Aviation Heritage Centre near Skegness and this will be fitted over the weekend.

Frances Cappuccini, 30, died after losing 2.3 litres of blood at Tunbridge Wells Hospital in Kent.
Consultant anaesthetist Dr Errol Cornish said stimulator drugs should have been in every theatre but he had to call for them.
The teacher died after giving birth to her second son on 9 October 2012.
More on this and other Kent stories
At a trial last January, Dr Cornish was cleared of gross negligence manslaughter and Maidstone and Tunbridge Wells NHS Trust was cleared of corporate manslaughter.
The inquest was told last week Mrs Cappuccini, 30, suffered a fatal haemorrhage after a piece of placenta was left behind from the operation.
Giving evidence on Tuesday at Gravesend Old Town Hall, Dr Cornish said the patient was not breathing and needed vital drugs to be brought round.
But it took five minutes for the nerve stimulator to arrive, it failed to work and there was a similar delay for another one, he said.
The inquest also heard another doctor, anaesthetist Dr Nadeem Azeez, removed Mrs Cappuccini's breathing tube at 12:30 BST - an hour after she was taken into the operating theatre following a haemorrhage.
Dr Cornish said in his opinion "from the documents I've seen and the evidence I've heard", the tube was removed too soon.
Asked if Dr Azeez was at a level that required consultant supervision, he said: "Not in every single case, but in this scenario."
The inquest continues.

Police said the 14-year-old reported feeling unwell and required hospital treatment. He was later discharged from hospital and is recovering at home.
The incident happened in Holywood, County Down, on Saturday.
The PSNI said the tablets were "as yet unidentified" but warned of the "potential dangers" they posed.
The 17-year-old, has been charged with possessing a Class A controlled drug with intent to supply; possessing a Class B controlled drug with intent to supply; possession of a Class A controlled drug; possession of a Class B controlled drug and supplying a Class A controlled drug.
He is due to appear at Newtownards Youth Court on 14 February.
Displays by the last two airworthy Lancaster bombers from World War Two have been cancelled after one suffered engine problems.
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