The FAA wants to penalize US Airways $354,500 for operating a Boeing 757 on 916 revenue flights between August 3 and Dec. 3, 2010, when it was not in compliance with Federal Aviation Regulations. The FAA alleges that US Airways removed and replaced a leaking engine fuel pump on the aircraft on Aug. 3, 2010, and that the carrier failed to carry out FAA-required tests and inspections before returning the aircraft to revenue service. US Airways has 30 days to respond to the agency.