A Qantas Boeing 737 made an emergency landing in Sydney due to an engine failure shortly after takeoff, causing a grass fire that temporarily closed one runway. Flight QF520, en route to Brisbane with around 170 passengers, encountered issues just minutes after departure. A loud noise was reported by passengers, followed by difficulty in climbing. The flight returned to Sydney after circling the airport. Qantas confirmed the incident involved an isolated motor issue, clarifying that there was no explosion. The Australian Border Force is investigating due to previous technical malfunctions at international airports.