General > General Technical Chat
And now the Boeing 777...
coppice:
--- Quote from: Tom45 on February 23, 2021, 03:35:07 pm ---
--- Quote from: drussell on February 23, 2021, 10:27:00 am ---
--- Quote from: Tom45 on February 23, 2021, 02:23:16 am ---
--- Quote from: drussell on February 23, 2021, 02:10:01 am ---Are you somehow sure it was Boeing's fault?
--- End quote ---
Yeah, only 777's with the Pratt & Whitney engine are grounded.
--- End quote ---
So you're saying it is somehow the 777's fault?
You would be totally comfortable getting on an Airbus with PW4000s, or a 747? :o
--- End quote ---
You got that the wrong way around.
--- End quote ---
I think you worded it the wrong way around. It doesn't seem like "Are you somehow sure it was Boeing's fault?", "Yeah" is what you really meant.
SiliconWizard:
--- Quote from: drussell on February 23, 2021, 02:10:01 am ---Are you somehow sure it was Boeing's fault?
It's a Pratt & Whitney Dependable Engine fitted on that thing, and serviced by UAL's maintenance team.
--- End quote ---
I'm not drawing any conclusion at this point. Only full proper investigation will. All we know is, as said above, all 777's with those engines are now grounded. So, sad times for Boeing. It certainly won't help restoring confidence or help Boeing's business.
floobydust:
--- Quote from: Brumby on February 23, 2021, 04:37:39 am ---
--- Quote from: floobydust on February 23, 2021, 03:47:10 am ---Fuel was shutoff, fire was going on for a very long time.
--- End quote ---
To me, the fire is quite subdued - and is diminishing all during that clip. Could it be there was still fuel in the lines between the shut-off and the engine? Could it be other oil lines or hydraulic lines feeding it?
People really need to stop hypothesising and just wait for those who actually know something have a look and tell us.
--- End quote ---
At this point, all there can be is speculation and conjecture.
Although amazingly, one blade piece was found in a soccer field in Broomfield and shows signs of metal fatigue.
"Under a microscope, Sumwalt said, "You can actually count the number of (flight) cycles since the initiation of that fatigue."
The fire I think is a second problem, imagine if the plane had to dump fuel.
{NTSB Chair} Robert Sumwalt said "We do have indications that the fuel to the engine was turned off, so we will be looking to see what would have continued to propagate a fire".
drussell:
--- Quote from: floobydust on February 23, 2021, 06:52:33 pm ---
--- Quote from: Brumby on February 23, 2021, 04:37:39 am ---
--- Quote from: floobydust on February 23, 2021, 03:47:10 am ---Fuel was shutoff, fire was going on for a very long time.
--- End quote ---
To me, the fire is quite subdued - and is diminishing all during that clip. Could it be there was still fuel in the lines between the shut-off and the engine? Could it be other oil lines or hydraulic lines feeding it?
People really need to stop hypothesising and just wait for those who actually know something have a look and tell us.
--- End quote ---
At this point, all there can be is speculation and conjecture.
Although amazingly, one blade piece was found in a soccer field in Broomfield and shows signs of metal fatigue.
"Under a microscope, Sumwalt said, "You can actually count the number of (flight) cycles since the initiation of that fatigue."
The fire I think is a second problem, imagine if the plane had to dump fuel.
{NTSB Chair} Robert Sumwalt said "We do have indications that the fuel to the engine was turned off, so we will be looking to see what would have continued to propagate a fire".
--- End quote ---
The misconceptions surrounding the dumping of fuel are covered in the Blancolirio video posted above by WattsThat.
A reasonably thorough description of the flight reverser mechanism where the flames from the burning hydraulic or lubrication oil can be seen is in the AgentJayZ video posted even earlier above, also by WattsThat.
SiliconWizard:
Note they had another engine fire the same day on a 747: https://www.euronews.com/2021/02/22/two-people-injured-by-debris-after-boeing-747-suffers-engine-fire-over-netherlands
Apparently the same engines. That's very unlucky.
There were previous similar incidents in the past. Investigation will tell if they are at all related.
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