King Charles will lead the nation in remembrance of those killed in the Air India plan crash, during the minute’s silence observed during Trooping the Colour.
His Majesty requested the moment be dedicated to the 241 passengers and crew killed, as well as those affected by the disaster, during the ceremony on Saturday.
The Boeing 787 Dreamliner destined for London Gatwick Airport crashed moments after take-off in the Indian city of Ahmedabad on Thursday.
Aboard the flight, there were 169 Indian nationals, 53 Britons, seven Portuguese nationals and one Canadian, Air India says.
The cause of the crash has not yet been determined.
The sole survivor of the crash has been identified as British national Vishwashkumar Ramesh, who was in seat 11A.
Mr Ramesh is recovering in hospital and says: "I still cannot believe how I made it out alive"
Charles, 76, offered his condolences soon after the crash, saying he was "desperately shocked by the terrible events" and expressing his "deepest possible sympathy".
Trooping of the Colour, also known as the King’s Birthday Parade, is a ceremony of military pomp on Horse Guards Parade.
Black armbands will be worn by heads of state, senior royals, coachmen and women from the Royal Mews riding in the ceremony.
Among those expected to be involved are the Prince of Wales, Colonel of the Welsh Guards, the Princess Royal, the Duke of Edinburgh, Colonel Scots Guards.
Members of the royal family who are not participating in the parade, but watching from the Duke of Wellington's former office, will not wear black armbands.
A spokesman for Buckingham Palace said the King requested the programme for the day to be amended “as a mark of respect for the lives lost, the families in mourning and all the communities affected by this awful tragedy".
Similar amendments to the programme were made in 2017, following the Grenfell Tower fire, which was marked by a minute's silence, led by Queen Elizabeth II.
The minute’s silence will take place shortly after the monarcch has inspected the guardsmen on the parade ground.
It will be signalled by a bugler sounding the Last Post and will end with the Reveille.
