Largest turbofan of history, GE9X makes first flight

General Electric Aviation starts flight tests for the new Boeing 777X engine

General Electric, manufacturer of the GE9X turbofan, completed the first test flight of the jet engine, the largest ever developed in history. A Boeing 747-400 test platform took off from the airport of Victorville, California, on Tuesday with the engine in the left inner pylon.

The first flight spent four hours in the air to validate the operation of the engine before the beginning of the certification phase, scheduled for May. The GE9X will be used by the new Boeing 777X.

“The GE9X and Victorville teams have spent months preparing for flight testing of the engine, and their efforts paid off today with a picture-perfect first flight,” said Ted Ingling, general manager of the GE9X program at GE Aviation. “Today’s flight starts the beginning of the GE9X flight test campaign that will last for several months, allowing us to accumulate data on how the engine performs at altitude and during various phases of flight.”

The GE9X numbers are impressive: the diameter of its fan is about 134 inches, 55% larger than the CF-6 engine, one of the first turbofans used in widebodies like the DC-10 – just compare its size in the 747 test wings to better understand this difference. There are only 16 carbon fiber blades and a more efficient design that reduce fuel consumption and noise. The compression ratio is 27 to 1, the highest rate ever used in commercial aviation.

So far, GE has a backlog of 700 GE9X engines that is expected to be certified in 2019, according to the company. With more than 100,000 pounds of thrust, the new turbofan should represent a 10% fuel economy. Onboard the 777X, the new engine is expected to debut in commercial operation by 2020.


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