Wembley's iconic arch was being raised into position on Friday, the first stage in its installation.
The 440ft structure weighing 2,000 tons has been suspended by cables and the operation is expected to completed in coming weeks.
Despite defects found in the steel in March, project bosses pledged the arch would be lifted ahead of schedule.
Wembley remains on target to open in 2006, with that year's FA Cup final set to be the first match.
Construction managers said some "minor rectification works" were required on finding the defects in March and stressed the arch was not unsafe.
What were described as "quality assurance checks"
revealed more work was needed on the complex structure's steel.
The £757m Venue of Legends has tabled a bid to stage the 2007 Champions League final.