United Airlines inspecting dozens of 777s

CHICAGO, IL 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.

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.

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