The Boeing 777X’s First Flight Could Be Nearer Now That GE Has Delivered Flight Compliant Engines

In a pleasant surprise, it seems Boeing might bring forward the Boeing 777X’s first flight. General Electric, the builder of the Boeing 777X’s engines, has delivered a new GE9X engine ready to be installed on the airframe.

Boeing 777X emirates
A new engine has been delivered to Boeing. Photo: Boeing

What are the details?

Boeing was trucking along nicely with the Boeing 777X program earlier this year. They had completed the electronic tests, had finished painting the fuselage and conducted taxi tests.

However, when they were gearing up to do their first flight tests they ran into a problem with the engines. Specifically, they discovered durability problems in the high-pressure compressor. This would mean that the engine would break down in flight and not be up to scratch for what Boeing needed the powerplant to do.

777x engine
The GE9X engines have been fixed. Photo: Dan Nevill via Wikimedia Commons

“The GE9X engines are the compliance engines that will be returned for the high-pressure compressor hardware enhancements that GE revealed at the Paris Air Show. GE Aviation remains aligned with Boeing on this effort as we work toward first flight”. – GE Aviation to Flight Global.


The engine is massive, weighing in at 16,300 kg (36,000 lb) and with a 13-foot diameter, it is no easy object to replace. In fact, it is so wide that the fuselage of the Boeing 737 actually fits inside the engine. Boeing and GE had to hire an Antonov AN-124 to move the engines back to the GE Ohio facility. Because it was a Russian aircraft operating in US airspace, it required special permission from the US department of defense.

This news made Boeing report that it was unlikely to fly the Boeing 777X until at least 2020.


“The 777X program is progressing well through pre-flight testing. While the company is still targeting late 2020 for first delivery of the 777X, there is a significant risk to this schedule given engine challenges, which are delaying first flight until early 2020.” – Boeing Statement at 2nd Quarter earnings call

What is the situation now?

According to Aviation Week, the replacement engine has been delivered with the fix in place to Boeing in Washington.

This means that Boeing has everything it needs to conduct the first flight test. Whilst it previously said it would likely not fly the aircraft until 2020, the surprise return of the repaired engine to the factory with three months to go is a positive development.

The engine still needs to undergo all the same tests as the last edition, such as electronics, taxiway tests, and durability. Hopefully, it will pass all of them with flying colors.

Boeing 777x
Perhaps we will finally see a flight as an early Christmas present. Photo: Boeing

If Boeing is able to return to its original schedule (or close to it), then it is possible that the launch customer Lufthansa will have its 777-9 only a few months behind its original delivery date.

Plus, this will solve the delays to the Boeing 777X deliveries that have seen Emirates believe their 777X won’t fly until 2021 and Qatar considering to reconfigure their order as well. 

What do you think? Will Boeing fly the 777X before the end of the year?


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I sure hope it flies this year. All the testing was done already and with the properly built engines it can now carry on and surprise us all with a takeoff. Boeing can also use a shot in the arm after possibly having had it’s worst year ever. My fingers are crossed!

Peter Ehrler

What about the cargo door that blows out when under pressure?

Opuada Onyemelukwe

Luckily for them that happened at 99% of the load testing which means in reality it is actually fine because even nature cannot put the plane under that amount of pressure. So they’ll be fine on that, I’m sure a fix is already in place given the engine has been away


Well… Not really… By stating this, you are removing all the concept of safety margins… The safety margins are applied on the loads, and on the material to reduce its theoretical resistance. However, experience shows that those margins are what makes aircraft, buildings, cars and so on so resistant. If testings don’t reach the expected resistance by failing before the expected value, it means whether that the resistance of the material is too weak, or that they reduced the safety margins. Either way, it is the sign of an issue, and we should definitely look at this as a minor… Read more »


Im sure you’re right….but the point is a fix has been made which I’m sure they’ll retest. The key issue here is timeline which Boeing has said won’t be affected


I think Boeing still have to sort out a potential hatch issue before the bird is ready to fly. Hopefully it is a relatively minor fix. The airworthy engine has got to be good news though.
Right now they need all the good news they can get.

David G

Good luck to Boeing on getting the new 777 into the air. They certainly need it.
But, quote “GE has delivered a new GE9X engine”. Don’t they need TWO new engines?

Barbara Seced

This is not a surprise, it’s actually late. Furthermore, only ONE engine was delivered so far. Boeing also officially postponed EIS to early 2021.


Let’s hope the new engines won’t require the deadly mcas

Andrew Boydston

Mitigating entry into service risks is what Boeing is doing with it 777X program. Gone are the days of that’s the way we always do it! It will first fly in January. My vote for first flight of the 777X is February 2 on Groundhog Day.