United Airlines said seven of its 747 jets, including one in Denver, were past due for checks on test equipment and the carrier retested them Thursday.
Chicago-based United said it was alerted by the Federal Aviation Administration that equipment to test the altitude-indicating system on the 747s was overdue for calibration. Work on the planes had been done in South Korea.
United, which is the largest carrier at Denver International Airport, told the FAA it is retesting the aircraft. United said no planes were grounded because it is doing the work while the planes are normally scheduled to be on the ground.
The move by United comes after Southwest Airlines last week grounded dozens of its planes to examine them after acknowledging it had missed required inspections of some planes for cracks. This week, acting FAA administrator Robert Sturgell directed federal aviation inspectors to reconfirm that commercial carriers have complied with all airworthiness directives.
United said its testing was not related to that directive from the FAA and not related to an airworthiness directive.
Kelly Yamanouchi: 303-954-1488 or kyamanouchi@
