#21271129. They circle to burn fuel like every other aircraft that can't dump fuel. If needs be & they must land heavy well then the aircraft may be damaged & a runway/airport closure could follow.
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For some aircraft types, the maximum allowable landing weight is substantially less than the aircraft's take-off weight. The Boeing 747, 777, and Airbus A380s are examples, and these three aircraft types do have fuel dumping capabilities. These are large, heavy aircraft, and fuel adds a significant amount of weight.
Some A330s have fuel dumps and some don't. It is/was an option. Even so, fuel dumping is generally only reserved for those times when it's necessary. If the need to land is not pressing (not all emergencies demand an immediate landing), then the crew may elect to just “burn off” the fuel rather than dump it.
CBS News reported that, based on the expert opinion of a former Boeing 777 captain, Flight 89 would have likely dumped 15,000–20,000 US gallons (12,000–17,000 imp gal; 57,000–76,000 L) of fuel. Shortly after completing the fuel dump, the aircraft landed safely.
Larger planes like the Boeing 747, on the other hand, have fuel jettison systems. If the aircraft tried to land without dumping the fuel first, it is considered an overweight landing attempt and could place immense stress on the airframe. It could also increase the risk of fire and fuel leaking onto the tarmac.