Records wrongly showed maintenance work to have been completed
Safety work on a plane whose nose landing gear collapsed at London City Airport had not been properly completed by a parts manufacturer.
Smoke filled the British Airways Avro 146 jet, carrying 67 passengers, as it landed on 13 February 2009.
A fatigue crack led to the landing gear fracturing, an investigation found.
Improvement work on the plane had not been fully finished by the US firm responsible, even though records showed it had been.
The Air Accidents Investigation Branch (AAIB) also found there had been "poor surface finish during manufacture" of the aircraft, necessitating the safety improvements which were not properly completed.
As the plane, which had a crew of four on board, touched down at the end of a flight from Amsterdam, the nose landing gear penetrated the fuselage.
All the passengers were safely evacuated from the plane, 66 of them leaving via an emergency chute.
Two people suffered minor injuries and the airport was shut for several hours.
The AAIB report noted the plane's public address system was knocked out due in part to damage sustained in the crash.
However, no safety recommendations were made by the AAIB as inspections and maintenance have been tightened since the crash.
British Airways said it welcomed the report.
"There are no specific safety recommendations for BA, but we have worked with the relevant authorities and manufacturers to ensure that the highest safety levels are maintained," said a spokesman.