US Airways and United Airlines both stand to receive multi-million dollar fines from the FAA for maintenance violations.

US Airways' violations include failing to inspect cargo doors and landing gear on a few plans and for failing to perform routine checks on dozen of others. US Airways responded quickly to the news, saying that the violations stem from the integration of their maintenance systems back from October 2008 to January of 2009, and that they are working on addressing the issues. The airline could be fined up to $5.4 million. This is the isn't the first time US Airways has been fined this year either. In January, they were fined for violating rules involving oversold flights.

United's violation is perhaps more troubling. The airline faces a $3.8 million fine for a single incident. In April 2008, a Boeing 737 returned to Denver after its engine shut down with low oil pressure. When the engine was inspected, two shop towels were inside. The towels "had been used to cover openings in the oil sump area" instead of the regulation caps. The towels were believed to have been there since December 2007, when maintenance was performed on the engine. This sounds terrifying, but according to the Cranky Flier website, it isn't quite as scary as it sounds. The caps are only used during maintenance and then removed.

But still, the FAA is taking the incident seriously. "As a result of United's failure to follow its maintenance procedures. . .it flew the aircraft on more than 200 revenue flights when it was not in an airworthy condition," the FAA said in a statement.

[via ABC News Denver]

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