The Federal Aviation Administration proposed a $250,000 civil penalty against AirTran for allegedly failing to repair an angle-of-attack sensor on a Boeing 737 after the plane was struck by lightning on March 20, 2009.

The sensor warns if there is a potential loss of lift. The FAA said AirTran deferred repair, but the FAA does not allow airlines to defer fixing a damaged or inoperative angle-of-attack sensor.

AirTran operated four flights while the plane wasn’t in compliance with FAA regulations, the FAA claimed.

The airline has 30 days to respond to the FAA's enforcement letter.

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