Since most twin jet airliners can meet these requirements, most aircraft of this type such as the Boeing 737 (all models), the DC-9/MD80/Boeing 717, the A320 family and various regional jet (RJ) aircraft do not have fuel dump systems installed.
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Airlines find that fuel dumping can actually be cheaper than not dumping in certain circumstances. But it's not something pilots do on a routine basis. We spoke with Alison Duquette, spokesperson for the Federal Aviation Administration (FAA), who assured us that it doesn't happen very often.
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.
#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.
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.
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.
When an airplane experiences less drag, it consumes less fuel. This relationship between speed and fuel consumption means that flying at a slightly slower speed can result in significant fuel savings for airlines, which in turn can lower operating costs and potentially reduce ticket prices for passengers.
Fuel is usually discharged to reduce the aircraft's weight to facilitate making a safe landing. The following situations illustrate some conditions when fuel discharging is necessary.
There are two reasons for this, one related to the aircraft itself and the other to how they are used on transpacific flights. Aircraft with four engines, or “quads”, tend to be less fuel-efficient than twinjets due to inherent design factors such as a higher wing weight and a smaller engine fan diameter.