From the Wall Street Journal:
"United Airlines has temporarily grounded several Boeing 747 jumbo jets to check for compliance with federal maintenance requirements, in a move that signals the controversy over government oversight of airliner safety checks and repairs is spreading, according to three people familiar with the issue.
United 's move, which one person familiar with the matter said covers as many as six long-haul 747 aircraft that had some of their cockpit instruments validated as part of an overseas maintenance check, comes as U.S. airlines are stepping up self-audits of their maintenance compliance. . . .
The FAA ordered the temporary groundings after discovering that test equipment used at a maintenance station in South Korea was faulty, according to one person familiar with the issue."
http://online.wsj.com/article/SB1206..._us_whats_news
(subscription may be required)