WATCH: Passenger films cover falling off plane engine during flight

Images posted on social media show a plane engine with the exterior cover missing as the plane approaches Honolulu.

The United Airlines flight landed safely yesterday in Honolulu after an engine cover came off during its flight from California, the airline said.

Video shows the engine shaking back and forth with pieces of the cover flapping in the wind.

“Our pilots followed all necessary protocols to safely land the aircraft,” United said in a statement, adding that all passengers departed the Boeing 777 normally at the gate.

The airliner landed as emergency responders waited nearby, said Hawaii Department of Transportation spokesman Tim Sakahara.

Flight 1175 was travelling to Honolulu from San Francisco.

United Airlines spokeswoman Natalie Noonan says Flight 1175 made an emergency landing due to a mechanical issue.

“There was a loud bang ... and then the plane really started shaking,” passenger Allison Sudiacal told Hawaii News Now. “There was a loud boom and then it was like rattling and the plane was kind of shaking like boom, boom, boom.”

Sudiacal was travelling with her four-month-old son, her husband, Tim, and his parents.

“They let us know that we had to brace for impact in case there was a rough landing. It was scary. But they did a really good job,” Sudiacal said.

An emergency was declared due to a vibration in the right engine, said Federal Aviation Administration spokesman Ian Gregor said in an email, adding that the agency will investigate the incident.

This photo provided by passenger Haley Ebert shows damage to an engine on what the FAA says is a Boeing 777 after parts came off the jetliner during its flight from San Francisco to Honolulu yesterday. Pic: Haley Ebert via AP)

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