KONTAN.CO.ID - WASHINGTON - The U.S. Federal Aviation Administration on Sunday said it would investigate after an engine cowling on a Southwest Airlines LUV.N Boeing 737-800 fell off during takeoff in Denver and struck the wing flap.

Southwest Flight 3695 returned safely to Denver International Airport around 8:15 a.m. local time on Sunday and was towed to the gate. The Boeing BA.N aircraft with 135 passengers and six crew members aboard had been headed to William P. Hobby Airport in Houston.

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No one was injured.

Southwest said it was flying passengers on another plane to Houston approximately three hours behind schedule. Southwest said maintenance teams are reviewing the aircraft.

The plane entered service in June 2015, according to FAA records. Boeing referred questions to Southwest for information about the airline's airplane and fleet operations.

The airline declined to say when the plane's engine had last had maintenance.

ABS News aired a video posted on social media platform X of the ripped engine cover flapping in the wind with a torn Southwest logo.

Boeing has come under intense criticism since a door plug panel tore off a new Alaska Airlines ALK.N 737 MAX 9 jet at 16,000 feet on Jan. 5.

In the aftermath of that incident, the FAA grounded the MAX 9 for several weeks, barred Boeing from increasing the MAX production rate and ordered it to develop a comprehensive plan to address "systemic quality-control issues" within 90 days.

Boeing production has fallen below the maximum 38 MAX planes per month the FAA is allowing. The Justice Department has opened a criminal investigation into the MAX 9 incident.

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The 737-800 is an earlier generation of the best-selling 737 from the current MAX.

The FAA is investigating several other recent Southwest Boeing engine issues.

A Southwest 737 flight on Thursday aborted takeoff and taxied back to the gate at Lubbock airport in Texas after the crew reported engine issues. The FAA is also investigating a March 25 Southwest 737 flight that returned to the Austin airport in Texas after the crew reported a possible engine issue.

A March 22 Southwest 737-800 flight returned to Fort Lauderdale airport after the crew reported an engine issue. It is also being reviewed by the FAA.

Editor: Syamsul Azhar