BEIJING (AP).- One of the architects behind the busiest airport in Asia said Thursday that substandard materials or installation — not design flaws — are likely to blame for wind blowing parts of the roof off Beijing’s three-year-old Terminal 3. The airport is the result of a frenetic Chinese building boom that has produced numerous architectural marvels, though some of the iconic new projects have been hit by quality and safety problems. State media say passengers reported seeing bits of white and yellow roofing material blowing across runways and through parts of the $2.8 billion terminal on Tuesday. In statements issued earlier this week, the airport said no one was hurt and operations were not affected. It was the second time in a year that wind damaged the airport. The Beijing airport handled nearly 74 million passengers in 2010, making it the second-busiest in the world after Hartsfield-Jackson Atlanta International Airport