ABC News September 30, 2019

Dramatic video as engine cover comes loose on United jet

WATCH: Passengers speak out after engine cover detaches mid-flight

After their United Airlines plane departed from Denver headed to Orlando early Sunday morning, passengers aboard Flight 293 looked out their window to a frightening sight: an engine cover had broken loose and was flapping around, leaving the engine exposed.

Half an hour after taking off, pilots asked air traffic controllers at the Denver International Airport to return to the airport, saying that, “an engine panel has become detached from the airplane.”

Bobby Lewis
An engine flap on a United flight came detached midair, Sept. 29, 2019, after departing Denver International Airport.

Passengers said they were relieved and grateful for what they said was the pilots' quick response.

“The pilot really took some heroic action,” Kahlin Grant said. “He made a big decision to turn us around quickly, he essentially saved some lives.”

In a statement, United said that the flight “returned to the airport due to a mechanical issue with one of the engines.” According to experts, the purpose of the engine cover is mostly aerodynamic and does not necessarily affect the operation of an engine.

Bobby Lewis
An engine flap on a United flight came detached midair, Sept. 29, 2019, after departing Denver International Airport.

This is not the first time a flight has been diverted by a problem with an engine cover coming loose. Last November, a Frontier flight returned to the airport in a similar incident.

In another incident last year involving a United jet, an entire engine cover was ripped off in mid-air on flight to Hawaii.

Despite these incidents, it is still rare for planes to divert because of mechanical or other problems. According to the Bureau of Transportation Statistics, from July 2018 until July 2019, less than one percent of flights were diverted.