New Boeing 777X Engine Completes Final Test Flight

The Boeing 777X’s engines have finished their flight tests. The engines were being tested aboard a modified Boeing 747 in the Mojave desert. Testing concluded following 320 flight test hours.

GE9X Boeing 777X
The aircraft which the GE9X has been tested on. Photo: JBabinski380 via Wikimedia

The new GE9X engine will power the 777X aircraft currently in the late stages of development at Boeing. The aircraft is still due to take its first flight. So far it has only been revealed officially to employees. In the wake of the 737 MAX crisis, it was deemed to be insensitive to go ahead with the planned public reveal of the plane.

Seven years in the making

The GE9X engine has now been seven years in the making, as General Electric initially announced the program back in 2012. In the past seven years of development, an awful lot of hard work has gone on behind the scenes. Indeed, now the GE9X has completed a mountain of testing. The Air Current pointed out that the GE9X engine is, in fact, bigger than the fuselage of a Boeing 737:



In 2016 the first test engine completed its test runs. In 375 cycles it completed 335 hours of testing. The next step in testing the engine saw tests take place in extremely cold temperatures. Following the completion of this stage, it was time to start working on constructing more engines. Now, according to Aviation Week, the testing of the engine is complete.

The Boeing 777X

The Boeing 777X is ready to begin a series of vigorous testing. The aircraft is expected to take its first flight in the second half of 2019. Following this testing, it is expected to enter service in late 2020.

Lufthansa will be the launch customer of the Boeing 777X. As such, despite testing still yet to get underway, the first aircraft has almost finished taking shape. It is unclear right now whether Boeing is still intending to do a public reveal of the aircraft give the event’s previous cancellation. However, rumours indicate the company is still looking to run one at some stage.

GE9X Boeing 777X
The GE9X will power the new Boeing 777X aircraft currently being tested. Photo: Boeing

Innovative technology

The new GE9X engines are just part of the impressive array of innovative technology being implemented on the Boeing 777X. Additionally, the aircraft has become well known for its new wingtips, which fold up to reduce the aircraft’s wingspan when it’s on the ground. However, when the aircraft is flying, they are folded out to increase the lift generated.

The pilots of the aircraft will also notice a huge difference when flying the aircraft. Indeed, the 777X will be fitted with advanced touch screens in the cockpit. These, Boeing says, are a first for commercial aviation, and have themselves been subjected to five years of testing.

Are you excited to see the Boeing 777X fly with the GE9X? Let us know in the comments.


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ogden lafaye

Larger engines on the 777X??? Didn’t they put larger engines on the 737 Max’s? Wasn’t there a center of balance issue with the 737 Max that resulted in added software that killed people?

Neither of these planes are designed around the larger engines. When will they learn?

James Thurber

Larger? Not quite the same issue as the 737 Max series. The new 90 series is designed to be more powerful and MORE fuel efficient. In terms of size and weight – pretty darn close to the original.

These are MAGNIFICENT engines. Sure would love to have one in my garage to play with – start up and scare the neighbors!


I don’t trust these softwares which goals are too demanding &ambtious ( that is controlling the balance of an aircraft built for smaller engines) which need regular and constant updates .


I don’t trust these globes that are round…


Ogden and Caroline are concerned the change from 777-300 to 777-9 is similar to 737 NG to MAX. Yes, Boeing is installing larger engines. However they completely re-designed the wing, and so they can adjust the engine, wing, fuselage for ideal balance for flying qualities. Second, the 777 was designed for engines to be far in front of wing. So the effect of new engines should be less than the 737 MAX engine changes.
My concern for any long aircraft is the relative flexibility of the fuselage making tuning the flight controls computer logic more challenging.

Uncle Q

I would love to fly it,I loved flying the 777.
retired 777 Capt.

Azman Shah

Y test the engine meant for 777 on 747?


Often done, its because you can have one new engine and three existing engines doing the heavy lifting so that you can turn it on and off, throttle it up and down and simulate failure modes without impacting the aircrafts performance.