A United Airlines flight was forced to make an emergency landing after fluid began leaking from the landing gear.
The plane took off from Sydney but on its way to San Francisco, hydraulic fluid was seen spilling from the sky.
The flight continued for almost two hours, reaching 30,000 feet before the pilots turned back to Australia.
Passengers were removed from the United Airlines Boeing 777-300 flight and were given hotel rooms overnight before new travel arrangements were made the next day.
A United Airlines flight was forced to make an emergency landing after fluid began leaking from the landing gear
YouTube/ NewYorkAviation/ Getty
Emergency services were on hand when the aircraft landed.
According to AirLive, "on approach, the landing gear compartment doors could be seen wide open, as well as smoke coming from one of the tires on the right-hand side of the aircraft".
A United Airlines spokesperson told GB News: "On Monday, March 11, United flight 830 from Sydney Kingsford Smith Airport to San Francisco International Airport returned to Sydney due to a maintenance issue.
"The plane landed safely and passengers deplaned normally at the gate. We are providing accommodation overnight for passengers and rebooking them to San Francisco tomorrow."
The incident is the latest in a catalogue of issues with manufacturing firm Boeing.
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On Saturday, a former Boeing employee who had raised concerns about the company's production standards was found dead.
John Barnett had been giving evidence in a whistleblower lawsuit and died from a "self-inflicted" wound on March 9.
In another incident on Monday, 50 people were left injured on LATAM Airlines Boeing 787 after the aircraft dropped abruptly mid-air.
The flight from Sydney to Auckland "froze" which sent passengers flying and leaving several bleeding and with broken bones.
Earlier this month, the engine of a Boeing 737 burst into flames mid-air, sparking another emergency landing.
Alaska Airlines flight makes emergency landing after window blows out at 16,000ft
Social MediaIn January, Boeing admitted fault for the mid-flight door blow out that took place on an Alaska Airlines plane.
The flight, new MH370 documents suggest 'pilot intended to make plane disappear forever' which was headed from Portland, Oregon to Ontario, California, was carrying 177 passengers and crew when it lost a portion of its fuselage just 35 minutes into the flight.
Following the incident, the airline said it would “temporarily” ground all 65 of its 737 Max 9 aircraft as it conducts inspections.
That was then increased to more than 170, with regulators stressing that passenger safety, “not speed”, will determine how soon they return to the skies.