The US Federal Aviation Administration (FAA) has proposed a $400,000 civil penalty against SkyWest Inc subsidiary Atlantic Southeast Airlines for allegedly operating a Bombardier regional jet while not complying with federal aviation regulations.
The regional airline had allegedly returned the aircraft to service after routine maintenance, but without an authorised signature on the airworthiness release and without an entry in the aircraft's flight discrepancy log, says the FAA.
The aircraft had made 49 revenue flights between 7 July and 15 July while it was not properly released for service.
The FAA did not specify the aircraft type, but Atlantic Southeast, which has merged with ExpressJet, operates CRJ200s, CRJ700s and CRJ900s.
Atlantic Southeast has 30 days from receipt of the agency's letter to respond.