There are eight pumps fitted to each Boeing 747-400 aircraft.
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Over the course of a 10-hour flight, it might burn 36,000 gallons (150,000 liters). The 747 burns approximately 5 gallons of fuel per mile (12 liters of fuel per kilometer). This sounds like a tremendously poor miles-per-gallon rating.
With today's fuel prices, it costs about $450,000 to fill up a Boeing 747, depending on your market. By contrast, the Gulfstream G280, a popular business aviation aircraft, costs around $8,000 to fill.
As a rule of thumb for the Boeing 747, pilots either quote dump rates ranging within 1–2 tons per minute or reference a thumb formula of dump time = (dump weight / 2) + 5 in minutes.
The cost of fueling your private jet can vary significantly. For example, on May 11, 2022, the IATA per gallon price was $4.82 in North America, $4.01 in Europe, and $3.55 in Asia. At Boston's Hanscomb Field Jet A was selling between $9.79 and $13.38 per gallon.
One pound of jet fuel is approximately 0.15 gallons. One gallon of jet fuel weighs approximately 6.7 pounds. The fuel can expand and contract with temperature changes, so the weight of one gallon can vary a bit. 6.7 pounds per gallon is the average for “normal conditions.
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.
There are four main fuel tanks in the wings, a tail plane tank, a center wing tank, and reserve fuel tanks in the outer wing sections. The maximum fuel capacity is 216,846 L (57,284 gal.).
In the event of an emergency requiring a return to the departure airport, the aircraft circles nearby in order to consume fuel to get down to within the maximum structural landing weight limit, or, if the situation demands, simply land overweight without delay.
The four engines of the Boeing 747 Jumbo Jet burn approximately 10 to 11 tonnes of fuel an hour when in the cruise. This equates to roughly 1 gallon (approximately 4 litres) of fuel every second. It can carry a maximum of 238,604 liters of fuel and it has a range of about 7,790 nautical miles.
The four engines of the Boeing 747 Jumbo Jet burn approximately 10 to 11 tonnes of fuel an hour when in the cruise. This equates to roughly 1 gallon (approximately 4 litres) of fuel every second. It can carry a maximum of 238,604 liters of fuel and it has a range of about 7,790 nautical miles.
While it's very clear that a 747 cannot fly properly with the failure of three engines, we can see that a single functioning engine would at least extend the aircraft's distance and prolong its time in the air.
As of Sep 22, 2023, the average annual pay for the Boeing 747 Pilot jobs category in Staten Island is $100,515 a year. Just in case you need a simple salary calculator, that works out to be approximately $48.32 an hour. This is the equivalent of $1,932/week or $8,376/month.
Without engine thrust, the 747 had a glide ratio of 15:1, meaning it can glide forward 15 kilometres for every kilometre it drops. After calculating the glide ratio, the crew realized that they had less than 30 minutes to regain power before they smashed into the ground.