Flightglobal.com's safety and operations editor David Learmount gives his views on what he describes as a "remarkable" accident at London's Heathrow airport on 17 January.
Learmount says: "The aircraft had either a total or severe power loss and this occurred very late in the final approach because the pilot did not have time to tell air traffic control or passengers."
He says that it was "quite a remarkable accident" and unlike any he has seen before.
He says: "The pilot had no choice but to heave the aircraft over the boundary fence and put it down."
- This graphic shows what happened to the aircraft as the pilot put the aircraft down
- BREAKING NEWS: BA 777 severely damaged in Heathrow landing accident
- Aircraft profile - Boeing 777
- Have your say about the incident on AirSpace
- Pictures of the incident