Eyad89 wrote:

It seems we are having some issues with the GE9X now as reported by Reuters. Anyone has more info?

https://www.reuters.com/article/us-boei ... SKCN1T62KU

Would that delay the first flight?

lightsaber wrote:

If you change flight software, regression testing is required. It is how I spent today.

Lightsaber

Eyad89 wrote:

lightsaber wrote:

If you change flight software, regression testing is required. It is how I spent today.

Lightsaber

Well, if it was just that, would the Boeing CFO call it “challenges that require re-testing?”

But I kinda see your point, the GE9X testing campaign should be all wrapped up by now.

In addition, demand for the 777X, and, in particular for the smaller 777-8X version, has been soft and recent sales have been sparse.

Boeing will build the 777-9X first and was expected to deliver the -8X model perhaps a year later. Smith said Boeing is “looking at the timing and demand for the -8 to see if that still makes sense and do we want to push that out?”

Eyad89 wrote:

lightsaber wrote:

If you change flight software, regression testing is required. It is how I spent today.

Lightsaber

Well, if it was just that, would the Boeing CFO call it “challenges that require re-testing?”

But I kinda see your point, the GE9X testing campaign should be all wrapped up by now.

Muilenburg says the controversy surrounding 737 MAX certification is unlikely to affect certification of the new widebody. “I don't see anything there right now that would significantly alter the timeline for the 777X, but it's possible we could see something that would alter the content of the test program or how we go about certification”.
......
“The other pacing item for us is with GE on the engine and we're continuing to work through engine testing and those two timelines will come together for flight testing later this year and then we still expect to achieve entry into service in 2020,” said Muilenburg.

747classic wrote:

The already delayed first flight of the Boeing 777-9, currently targeted for the end of June, looks set to be pushed back again after an ‘anomaly’ was detected in a General Electric GE9X engine undergoing pre-delivery factory tests.
“During a factory test an engine gave us a signal about its health. We had an anomaly in the compressor and we halted the run.”, according GE.
The problem area is in the front of the engine’s 11-stage high-pressure compressor.
“It’s a mechanical issue and nothing to do with the overall performance of the engine or the way it is set up,”
“It is not an aerodynamic issue whatsoever.” Various solutions are being studied, although GE declined to provide more detail until the fix is finalized.

See : https://aviationweek.com/commercial-avi ... a27b5245cf

Sooner787 wrote:

I'm wondering is another add on effect of the Max crisis on the 777X might be
the length of ETOPS certification granted at EIS ?

Not sure what length of ETOPS Boeing is looking for right out of the chute

tealnz wrote:

Seattle Times is reporting possibility of pushing back the 778 timetable in response to lack of demand...

Stitch wrote:

tealnz wrote:

Seattle Times is reporting possibility of pushing back the 778 timetable in response to lack of demand...

Not surprised considering the state of the order book. Boeing did the same with the 777-200LR.

747classic wrote:

“During a factory test an engine gave us a signal about its health. We had an anomaly in the compressor and we halted the run.”, according GE.

Blotto wrote:

747classic wrote:

“During a factory test an engine gave us a signal about its health. We had an anomaly in the compressor and we halted the run.”, according GE.

From what I hear that translates to seperated high pressure blades. But kudos GE, nice spin. "Signal about its health"

Blotto wrote:

747classic wrote:

“During a factory test an engine gave us a signal about its health. We had an anomaly in the compressor and we halted the run.”, according GE.

From what I hear that translates to seperated high pressure blades. But kudos GE, nice spin. "Signal about its health"

Jefford717 wrote:

Boeing just can’t catch a break. 2019 is a year to forget for the company. It all started with 737 MAX crash, 787 manufacturing safety concern, recent 737 airworthiness directives, lawsuit from left, right and center and now a possible delay for 777x EIS.

Revelation wrote:

Blotto wrote:

747classic wrote:

“During a factory test an engine gave us a signal about its health. We had an anomaly in the compressor and we halted the run.”, according GE.

From what I hear that translates to seperated high pressure blades. But kudos GE, nice spin. "Signal about its health"

Yep, they didn't say what kind of signal was sent. It could be anything from a few bytes on a network, to metal shards ejected out the back end of the engine.

BoeingVista wrote:

Blotto wrote:

747classic wrote:

“During a factory test an engine gave us a signal about its health. We had an anomaly in the compressor and we halted the run.”, according GE.

From what I hear that translates to seperated high pressure blades. But kudos GE, nice spin. "Signal about its health"

If a GE9X lost a fan blade during a run up this delays firs flight by months surely.

mjoelnir wrote:

@GlennFarleyK5.html

he talks first flight end of 2019

seabosdca wrote:

Is proceeding with gauntlet testing now consistent with a major engine-caused delay? (Genuinely asking, I don't know how the process works.)

The power of the single GE9X is such that for certain slower-speed test conditions, the big engine alone could be used to maintain the correct speed and altitude while the remaining three CF6s were pulled back to idle and flaps set at 20 deg.

Note the gold-colored throttle lever used to control the test engine.

Revelation wrote:

Cool presentation about GE9x testing at: https://aviationweek.com/pictures-fligh ... est-engine

My favorite part:

The power of the single GE9X is such that for certain slower-speed test conditions, the big engine alone could be used to maintain the correct speed and altitude while the remaining three CF6s were pulled back to idle and flaps set at 20 deg.

Note the gold-colored throttle lever used to control the test engine.

Very visual representation of the power of the GE9X.

I wonder if that is a FAA-approved rubber band on the gold throttle lever?

Anyone want to call the sat phone number and see if someone answers?

ikolkyo wrote:

Apparently WH001 will be doing 7 hour high power engine run. Pretty interesting considering the recent reports about the GE9X https://twitter.com/mattcawby/status/11 ... 24896?s=21

Revelation wrote:

I wonder if that is a FAA-approved rubber band on the gold throttle lever?

musman9853 wrote:

ikolkyo wrote:

Apparently WH001 will be doing 7 hour high power engine run. Pretty interesting considering the recent reports about the GE9X https://twitter.com/mattcawby/status/11 ... 24896?s=21

so most likely that story is BS. i'm no expert, but wouldn't it be a bad idea to do a high stress run if your engine is having problems?

Blotto wrote:

747classic wrote:

“During a factory test an engine gave us a signal about its health. We had an anomaly in the compressor and we halted the run.”, according GE.

From what I hear that translates to seperated high pressure blades. But kudos GE, nice spin. "Signal about its health"

Bricktop wrote:

Revelation wrote:

I wonder if that is a FAA-approved rubber band on the gold throttle lever?

Maybe I will start a thread on grandfathering of rubber bands.

OldAeroGuy wrote:

Bricktop wrote:

Revelation wrote:

I wonder if that is a FAA-approved rubber band on the gold throttle lever?

Maybe I will start a thread on grandfathering of rubber bands.

I think this is the same rubber band I saw being used during 737-200 flight testing in 1967.

JayinKitsap wrote:

OldAeroGuy wrote:

Bricktop wrote:

Maybe I will start a thread on grandfathering of rubber bands.

I think this is the same rubber band I saw being used during 737-200 flight testing in 1967.

Special rubber with a paper trail to the exact tree it came from, carefully stored in a climate controlled nitrogen refrigerator. Other endurance test samples were found wanting after 30 years requiring an AD for replacement due to corrosion and cracking. News picks up the AD and declares the 777 as doomed.

Still quite special as my desk drawer is filled with samples that are dried out, hard, and prone to cracking.

The specified use is to shoot the co pilot if he doesn't laugh at the pilots jokes.

pabloeing wrote:

Today taxi test in PAE for the B777X

MileHFL400 wrote:

Does this mean we ll see first flight soon?

Stitch wrote:

MileHFL400 wrote:

Does this mean we ll see first flight soon?

No. Boeing announced they are pushing it back until late Fall to allow GE time to verify the changes they are making to the GE9X and incorporate them on the eight engines assigned to the 777X test fleet.

clickhappy wrote:

777-9 has taken the runway for the first time. Airliners.net has rejected my uploads so, here you go:

https://www.flickr.com/photos/royalscot ... ed-public/