Fuel dump from one wing?

M Bornong

Senior Member.
When it's from one wing, isn't that likely a pressure relief release? I think there was a similar discussion some time ago.
 

Trailspotter

Senior Member.
When it's from one wing, isn't that likely a pressure relief release? I think there was a similar discussion some time ago.

Well, the duration of the video is 34 sec and there is neither the beginning, nor the end of the dumping fuel. Wouldn't this be a bit long for a pressure relief release?
 

deirdre

Senior Member.
"747 fuel dump" produced no results for November 2015, but there were a few in October and September:
i think he could have shared the video from really anytime. I'm not finding any indication that he himself took it (he's in Quebec)

i did find this October 31 2015, although i dont see airfrance colors on the tail.
having trouble finding original pic source too.
vol-paris-mexico-atterrissage-d-urgence-a-brest_2598151_660x447p.JPG
http://www.crash-aerien.news/forum/le-paris-mexico-atterrit-a-brest-t31861.html?start=15
 
Last edited:

Trailspotter

Senior Member.
The dark paint the tail edge is compatible with the Cathay Pacific livery, the closest by the date incident in the above list (#2) http://avherald.com/h?article=48e91a91&opt=1 :
Screen Shot 2016-07-11 at 17.55.55.png
[Broken External Image]:http://c8.alamy.com/comp/BN26W4/cat...rcraft-taking-off-heathrow-airport-BN26W4.jpg
As one of the engines was thought to have been damaged and on fire, it is possible that fuel dump was carried out on the other side only. Perhaps, there could be a matching image found in the Indian sources.
 

Trailspotter

Senior Member.
i think he could have shared the video from really anytime. I'm not finding any indication that he himself took it (he's in Quebec)

i did find this October 31 2015, although i dont see airfrance colors on the tail.
It looks like the Aviation Herald list of known incidents is incomplete. The Air France incident appears a more likely candidate, given the fact that the Facebook thread is mostly in French.
The tail paint also is compatible with the Air France livery. I found another photo of this fuel dump:
F-GITI by alexis boidron, on Flickr

Update:

Also, there is a dailymotion video of this fuel dump:
Screen Shot 2016-07-11 at 20.53.50.png
http://dai.ly/x3c40el

Source
 
Last edited:

deirdre

Senior Member.
Also, there is a dailymotion video of this fuel dump:
nice. i was looking like crazy for another video. and youre right, i cant see any tail colors in that video either, must be a sun issue.
upload_2016-7-11_16-4-27.png

given the fact that the Facebook thread is mostly in French
he's actually in Quebec according to one of his posts. Luckily i didnt think of that initially so i googled "airfrance fuel dump" :)
 

TWCobra

Senior Member.
image.jpeg


Fuel dumps on aircraft like the 747-400 are generally done symmetrically, in that the drill is to set the fuel remaining value that you want and open both wing jettison valves. This initiates the pump sequence. You want the fuel out of the big centre wing tank first, followed by the fuel in the larger inboard wing tanks. The system will do this automatically.

Once the centre tank is empty and the system senses an imbalance between the two inboard tanks (main 2 and 3), it shuts down the pumps in the tank with the lower value until balance is restored.

I thought that this would be the answer here but the schematic reveals a fuel cross flow manifold in the system that should still have fuel coming out of both jettison valves in this situation. It is pictured just above the STAB tank.

So the only real answer here as far as I can see is that one of the jettison valves failed to open.
 

Mick West

Administrator
Staff member
So the only real answer here as far as I can see is that one of the jettison valves failed to open.

I agree, that seems to be the only plausible explanation. No matter what other valves or pumps operate it's all going to the Jettison/Fueling manifold. Then if either of the jettison nozzle valves are open it will come out. There's no other way of making it come out of just one side.

http://www.meriweather.com/flightdeck/747/over/fuel-layout.html

20160711-163523-j6ih8.jpg
 
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