updated 4/2/2008 3:43:38 PM ET 2008-04-02T19:43:38

Four U.S. airlines are under investigation for failing to comply with federal aviation regulations.

Federal Aviation Administration officials say an audit of airline maintenance found three airlines had missed inspection deadlines. At a briefing at Washington’s Reagan National Airport, the officials said that wiring in the wheel well was one area where carriers failed to comply with “air worthiness directives.”

The agency would not name the carriers under investigation. FAA officials said penalties could be levied, though it would be several months before the probe was complete.

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