RIP, 747: Two Engines Are Enough
File picture shows a Qantas Boeing 747 flying past a 767 airplane with a newly unveiled Qantas logo on its tail in Sydney
It has taken decades, but the aviation industry has now accepted that airliners are safe enough flying over oceans—no matter how far—with only two engines, not three or four.
That is the real message behind Boeing’s new deal with its machinists’ union to build the next version of its 777 airliner in the Pacific Northwest.
From the beginning of the jet age, safety regulators wanted an assurance that if an airliner had an engine failure over water, it could still make it back to land—and that meant having at least two functioning engines left.
As a result, all long distance flying between continents was done on planes like the four-engined Boeing 747, the four-engined Airbus A340, or the three-engined McDonnell Douglas MD-11.
How different it is now. Engine failure is now such a rare event and engines are so much more powerful that an airliner left with only one engine is deemed safe enough to fly on routes where it can be more than five hours flying time from the nearest airport.
There have been no instances of a twin-engined jet, having lost power, having to ditch in the ocean. But there has been one white-knuckle ride for the passengers of a United Airlines 777 flying nonstop from New Zealand to Los Angeles. The plane lost the power of one engine beyond the halfway point and diverted to Hawaii’s Big Island. Against strong headwinds, it took 192 minutes to reach the runway.
The 777 is the poster child for this revolution—it’s the airlines’ favorite for the longest routes over water. With 1,500 777s delivered, nobody had died in one until the crash of Asiana Flight 214 in San Francisco last summer—and that was due to the pilots mishandling a landing, not an engine failure.
Ironically, with this new version of the 777, Boeing will eventually be killing off the demand for its legendary 747, the truly transforming and much loved machine that was the first airplane to bring overseas travel to the world’s masses in the 1970s.
The greater efficiencies (principally markedly less fuel consumption) of the two-engined 777 over the four-engined 747 mean that it is able to fly nearly as many passengers, around 400, more cheaply. As far as the 450-passenger 747 goes, its latest version, the 747-8, is selling far more strongly as an all-cargo carrier than as a passenger jet.
But by Boeing’s reasoning it’s better to replace your own icon than let someone else do it—and that someone else is Airbus. Airbus was forced to stop producing its four-engined A340 because it became too costly for airlines to operate it and remain competitive. The two-engined A330, meanwhile, has thrived.
Last year Airbus produced a direct competitor to the 777, its two-engined A350, bigger and more efficient than the A330. This reflected what all the airlines now saw as the optimal-sized plane for intercontinental routes between hundreds of cities, called point-to-point.