This time last year, American Airlines was forced to ground its fleet of MD-80 jets to fix problems with how the planes had been repaired, stranding tens of thousands of travelers and costing the airline millions of dollars. A year later, American is being subjected to a three-month audit of its maintenance practices as the FAA cracks down on maintenance and other issues, the Dallas Morning News reported. Most recently, the agency discovered that thrust reversers on American’s fleet of Boeing 777s weren’t reassembled correctly, and that mechanics were using the wrong tool to pack emergency slides in some other aircraft. While the airline is complaining about having to comply with the strictest letter of the law, it hasn’t had to ground large portions of its fleet, either, due to the FAA’s willingness to give the airline a flexible repair schedule. The new oversight comes after the FAA came under the gun last year for letting airlines get away with maintenance lapses.