Why does Boeing 777 have two engines?

Why doesn't a Boeing 777 have 4 engines instead of 2? . Because four turbofan-engines equates to twice as much maintenance-and-repair as two turbofan-engines . They also contain twice as many failure-points , thus engendering twice as many costly aircraft breakdowns .



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With four engines, airplanes can carry more passengers. Most wide-body airplanes have four engines for this reason. When compared to two-engine wide-body airplanes, those with four engines can carry more passengers. The Airbus A380, for example, has a passenger capacity of 853.

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“The Boeing 777's unique combination of superior range, outstanding fuel efficiency and passenger-preferred comfort has created long-range success for carriers around the world. And the 777-300ER now gives operators a perfect opportunity to extend that success.

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Can a wide body airliner land with a full fuel tank? Yes! But it is safer to land an aircraft below its published MLW. Using the B777-200 as an example.

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The aircraft is highly popular with airlines (more than 1,500 passenger and freighter variants have been delivered) because it can carry a large number of passengers — and cargo — long distances using only two engines.

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If both engines fail, the aeroplane is no longer being pushed forwards through thrust, therefore in order to keep the air flowing over the wings, the aircraft must exchange energy through losing altitude (descending) in order to maintain forward airspeed.

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In the decades following their introduction, their use has gradually declined due to a variety of factors, including the approval of twin-engine jets to fly farther from diversion airports as reliability increased, and an increased emphasis on fuel efficiency.

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Can planes fly on just one engine? Absolutely. That is what they are designed to do. By law, planes have to be able to fly from point A to point B, over water, on just one engine.

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This means that the aircraft can fly routes that take it as far as 330 minutes (five and a half hours) of single-engine flying time from the nearest viable airport. Other twin-engine airliners, like the Boeing 777, are also certified for ETOPS 330. The Boeing 767 is certified for as much as 180 minutes of ETOPS.

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Therefore, the ERJ135/140/145 members of the family are among the safest airliners in history. The Airbus A340 is also one of the safest, with no fatal accidents involving any of the 380 units since its introduction in March 1993.

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For one, the Airbus A380 has almost double the space onboard compared to the Boeing 777 series, thanks to its second level. This means the airline can afford to be a little more abundant with its first class and business class offerings onboard the A380 compared to the Triple Seven.

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