crownvic
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A340 dumps fuel touching down while on runway..

Fri Jul 05, 2019 10:04 am

I've never seen this before (article with photo below), bur a HIFLY A340 apparently had an inflight emergency en route from Orlando to Gatwick requiring a turn around a few hours into the flight back to Orlando. The article states before landing they circled off Jacksonville to jettison fuel and upon touchdown fuel was still being jettisoned, even onto the runway! I've never seen that before..I would think that is extremely dangerous. Can someone elaborate..

https://www.orlandosentinel.com/news/os ... story.html
 
paullam
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A340 dumps fuel touching down while on runway..

Fri Jul 05, 2019 11:29 am

Maybe some “eye witness” just saw vortexes?

Image

Unfortunately I couldn’t read the article as the website is blocked in Europe.
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Starlionblue
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Re: A340 dumps fuel touching down while on runway..

Fri Jul 05, 2019 11:29 am

paullam wrote:
Maybe some “eye witness” just saw vortexes?

Image


The pic in the article does seem rather like fuel is coming out of the jettison nozzle.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
paullam
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Re: A340 dumps fuel touching down while on runway..

Fri Jul 05, 2019 11:33 am

Starlionblue wrote:
paullam wrote:
Maybe some “eye witness” just saw vortexes?

Image


The pic in the article does seem rather like fuel is coming out of the jettison nozzle.


Maybe. I could just guess as I can’t read the article.
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Max Q
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Re: A340 dumps fuel touching down while on runway..

Fri Jul 05, 2019 12:15 pm

That picture definitely shows fuel coming out of one of the dump nozzles
The best contribution to safety is a competent Pilot.


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crownvic
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Re: A340 dumps fuel touching down while on runway..

Fri Jul 05, 2019 12:26 pm

 
zuckie13
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Re: A340 dumps fuel touching down while on runway..

Fri Jul 05, 2019 5:25 pm

Probably a failure in the valves or electronics that drive them.
Either that or crew forgot to close it after completing the dump.
 
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Starlionblue
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Re: A340 dumps fuel touching down while on runway..

Fri Jul 05, 2019 10:10 pm

zuckie13 wrote:
Probably a failure in the valves or electronics that drive them.
Either that or crew forgot to close it after completing the dump.


AFAIK on the A340, the system would stop jettisoning automatically when the preset fuel quantity was reached, or when reaching the hardcoded minimum figure. But the crew could have input too low a fuel figure and then forgotten.

A valve failure or similar seems more likely.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
OldAeroGuy
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Re: A340 dumps fuel touching down while on runway..

Sun Jul 07, 2019 3:01 am

Max Q wrote:
That picture definitely shows fuel coming out of one of the dump nozzles


Except the picture appears to be a 757. The 757 does not have fuel jettison (ie dump) nozzles.
Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
 
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7BOEING7
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Re: A340 dumps fuel touching down while on runway..

Sun Jul 07, 2019 3:54 am

OldAeroGuy wrote:
Max Q wrote:
That picture definitely shows fuel coming out of one of the dump nozzles


Except the picture appears to be a 757. The 757 does not have fuel jettison (ie dump) nozzles.


The displayed photos are indeed a 757 generating vortices however the linked photo is an AB dumping while on the ground.
 
787SIN
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Re: A340 dumps fuel touching down while on runway..

Sun Jul 07, 2019 6:50 am

Likely to be the Jettison Valve stuck open and centre pumps on most. Doesn’t get operated often except for required maintenance tests.

The aft fuel transfer gallery is always pressurised when these pumps are on, which is the same gallery the jettison nozzles come off.

Be surprised they left the system jettisoning.
 
CosmicCruiser
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Re: A340 dumps fuel touching down while on runway..

Sun Jul 07, 2019 12:11 pm

gee, guys looks like your standard condensation off the flap tips. I'm just referring to the photo not the article which I did not read. Obviously high humidity. Maybe they left the chemtrail switch on.
 
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Starlionblue
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Re: A340 dumps fuel touching down while on runway..

Sun Jul 07, 2019 1:40 pm

Just to get the pic into the actual thread.

Image
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
OldAeroGuy
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Re: A340 dumps fuel touching down while on runway..

Sun Jul 07, 2019 3:07 pm

No doubt this is an AB airplane dumping fuel while on the ground.
Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
 
CosmicCruiser
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Re: A340 dumps fuel touching down while on runway..

Sun Jul 07, 2019 4:14 pm

no doubt about that!
 
Max Q
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Re: A340 dumps fuel touching down while on runway..

Mon Jul 08, 2019 4:05 am

I’m surprised there’s not a weight on wheels lock out for the dump nozzles
The best contribution to safety is a competent Pilot.


Guns and the love of them by a loud minority are a malignant and deadly cancer inflicted on American society
 
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AirlineCritic
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Re: A340 dumps fuel touching down while on runway..

Mon Jul 08, 2019 6:09 am

Starlionblue, the picture is not visible at least for me (I'm in Europe, so maybe this is because of newspaper GDPR problems, same as for the article).
 
 
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Starlionblue
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Re: A340 dumps fuel touching down while on runway..

Mon Jul 08, 2019 8:48 am

Max Q wrote:
I’m surprised there’s not a weight on wheels lock out for the dump nozzles


It's still double redundant. Both the computerised shutoff at a given level, and the pushbutton in the overhead. If neither of those closes the jettison valve, weight on wheels probably won't either.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
spudsmac
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Re: A340 dumps fuel touching down while on runway..

Tue Jul 09, 2019 8:53 pm

I'm sure in the mess of getting the plane back with an emergency they just forgot to stop fuel. A big screw up but easy to see how it happened.
 
jetwet1
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Re: A340 dumps fuel touching down while on runway..

Tue Jul 09, 2019 9:10 pm

Could it becoming from an overflow tank ?

I doubt it given the volume (looks pressurized to me) but I am no way familiar with the fuel dumping systems.
 
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Starlionblue
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Re: A340 dumps fuel touching down while on runway..

Wed Jul 10, 2019 12:20 am

jetwet1 wrote:
Could it becoming from an overflow tank ?

I doubt it given the volume (looks pressurized to me) but I am no way familiar with the fuel dumping systems.


Any overflow would come out from a hole in the middle bottom of the outer wing, below the vent surge tank, which is outboard of the outer tank. Well outboard of the jettison nozzle.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo

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