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Passengers at the airport in Los Angeles: There have been repeated incidents on United Airlines flights recently.
Photo: Mario Tama / Getty Images
A United Airlines plane en route from San Francisco to Mexico City was forced to make an emergency landing in Los Angeles on Friday.
The crew of the Airbus A320 reported a hydraulic problem.
It is the fourth known emergency on a United flight this week.
According to the airline, the A320 has three hydraulic systems for redundancy reasons.
Preliminary information showed “that there was only a problem with one system,” it continued.
Meanwhile, the US Federal Aviation Administration (FAA) said it would investigate the emergency landing.
The airline said none of the 110 passengers were injured.
The plane landed safely at Los Angeles International Airport around 4:30 p.m. local time.
Fire engines were available for safety, but they were not needed, said Nicholas Prange, a spokesman for the Los Angeles City Fire Department.
Rolled off the runway, engine on fire, wheel lost
The incident is part of a series of mishaps.
The emergency landing came just hours after another United Airlines plane had to be evacuated.
A Boeing 737 Max rolled off the runway in Houston, Texas and got stuck in the grass.
According to the airline, there were no injuries among the 160 passengers and six crew members in this case.
On Thursday, a Boeing 777 lost a wheel while taking off from San Francisco.
The United plane with around 250 people on board, which was actually supposed to fly to Japan, landed in Los Angeles a little later without any problems.
Video footage shows one of the six tires on the left main landing gear coming off.
The tire landed in an employee parking lot at the San Francisco airport, where it struck a car and shattered the rear window before crashing through a fence and coming to rest in an adjacent parking lot.
The first known United incident this week occurred on Monday.
Flames erupted from the engine of one of the airline's Boeing 737-900s just 15 minutes after takeoff from Houston.
The trip to Fort Myers, California was aborted, the pilot turned back and landed the plane safely in Houston.
As United Airlines has now announced, the flames were probably caused by sucked-in bubble wrap.
The investigation into the incident is still ongoing.
There are always problems with aircraft from different manufacturers and airlines.
However, the Boeing company is currently receiving increased attention after a 737 Max 9 aircraft lost a part of the fuselage while climbing after takeoff at the beginning of January.
alw/AP