The American Civil Aviation Agency (FAA) has opened an investigation after a problem that occurred Thursday evening on a Boeing 737 of the American company Southwest. The airline said that the crew of this 737-800 NG (Next Generation), a version prior to the 737 MAX, had “received an indication of a possible engine problem” According to a recording of exchanges between the control tower and the cockpit, the pilot mentions “overheating of the brakes” and “a fire in the left engine” The FAA launched an audit of Boeing's quality control in recent months.