The Federal Aviation Administration on Sunday said it will launch an investigation after the engine cowling of a Southwest Airlines plane fell off during takeoff in Denver and struck the wing flap. The cowling is the protective cover over the plane’s engine.

Southwest Airlines Flight 3695 returned safely to Denver International Airport around 8:15 a.m. local time on Sunday after the pilot reported the incident, the FAA said. The plane was headed to William P. Hobby Airport in Houston.

In a statement, Southwest Airlines said it is working to get customers on their way to Houston on another aircraft after Flight 3695 landed safely in Denver and that its maintenance teams are reviewing the aircraft.

This is the second incident in recent days involving a reported malfunctioning of equipment on a Southwest Airlines flight. The FAA is investigating a reported engine fire before takeoff at Lubbock Preston Smith International Airport on Thursday.

This article was originally published on NBCNews.com