Screenshot, Twitter
United Airlines passengers experienced a horrific scare on Tuesday when a part of the plane’s engine literally fell off the plane midair.

United Airlines passengers experienced a horrific scare Tuesday when part of a engine fell off the plane midair.

As ABC News reported, the Hawaii-bound flight left San Francisco Tuesday afternoon and had to make an emergency landing due to a “mechanical issue” that caused the plane’s engine cover to detach from the plane.

The plane had been flying over the Pacific Ocean at the time of the crisis, according to CNN.

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

In total, 363 passengers and 10 crew members were aboard the flight, according to Hawaii News Now.

Sudiacal said the flight crew told the passengers to remain calm.

"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,” she said.

Her husband called the flight “absolutely terrifying.”

United Airlines said in a statement that the pilots "followed all necessary protocols to safely land the aircraft.”

Passengers couldn’t believe the moment.

"I thought we were going to die and hoped that my kids knew that I loved them," one passenger told ABC News.

She added, "It was horrible. "The flight attendants were really professional, but they were scared. You could tell from their face.”

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Passengers shared videos and photos of the plane’s horrific moment on social media, too.

In September 2017, the Salt Lake City International Airport practiced a safety drill for crashing planes, according to the Deseret News. Firefighters who participated in the drill rehearsed what they would do if a flight from San Francisco and Chicago needed to make an emergency landing in Salt Lake City.

The Federal Aviation Administration requires training for an emergency landing every three years, according to the Deseret News.