A Southwest flight took off from a closed runway in Maine. NTSB and FAA are investigating.
The National Transportation Safety Board and Federal Aviation Administration said on Friday they will investigate a Southwest Airlines flight that departed from a temporarily closed runway in Maine earlier this week.
An airport vehicle exited the runway in Portland before Southwest Flight 4805 began its takeoff roll and departed around 5:45 a.m. local time on Tuesday, according to the FAA.
Southwest said it is engaged with the NTSB and FAA to understand the circumstances of the departure. After the incident the plane continued safely to Baltimore, Southwest said.
Several other incidents involving Southwest flights in recent months have raised concerns.
Last week, the FAA said it was investigating Southwest flight 4069, which descended to a low altitude of around 500 feet (152.4 m) about 9 miles (14.5 km) from the Oklahoma City airport en route from Las Vegas.
During that incident the automated minimum safe altitude warning sounded, and an air traffic controller alerted the flight crew.
Earlier this month, the FAA and NTSB said they were investigating a May 25 Southwest flight of a Boeing 737 MAX. The NTSB said the plane experienced a "Dutch roll" at 34,000 feet while en route from Phoenix, to Oakland, California. Such lateral asymmetric movements are named after a Dutch ice-skating technique and can pose serious safety risks.
The FAA said this month it was also investigating a Southwest 737 MAX 8 flight in April that came within about 400 feet of the ocean off the coast of Hawaii after bad weather conditions prompted pilots to bypass a landing attempt at Lihue airport.
During the go-around, the first officer "inadvertently pushed forward on the control column while following thrust lever movement commanded by the autothrottle," according to a June 7 airline memo, and the plane began to descend rapidly, hitting a maximum descent rate of about 4,400 feet per minute.
The pilots in a post-debrief said seeing the severity of the flight "through the animations was a significant, emotional event," Southwest said, adding the incident prompted the airline to review data and trends related to its procedures, training, standards, and performance.
Contributing: Zach Wichter, USA TODAY
This article originally appeared on USA TODAY: Southwest flight takes off from a closed runway, prompts investigation
