CHICAGO (AP) -- United Airlines is testing dozens of Boeing 777s to make sure components of a cargo fire suppression system are operating effectively.
The Chicago-based airline says testing will be done on its fleet of 52 777s. It's warning passengers to be prepared for delays and cancellations.
No 777 jets fly into Knoxville, but connections at Chicago O'Hare or Washington Dulles could be a problem.
United says a review of maintenance records shows a test on one of five bottles in the fire suppression system hadn't been performed. The subsidiary of UAL Corporation alerted authorities.
United carried out unscheduled maintenance on seven of its Boeing 747 jets last month but found no safety-related issues.
The Federal Aviation Administration has been checking maintenance records at all domestic airlines.
(Copyright 2008 by The Associated Press. All Rights Reserved.)