Fuel dump after regular flight?


#1

I was a passenger in this uneventful 9h40m flight: http://flightaware.com/live/flight/CCA963/history/20120703/0600Z/ZBAA/EDDL

During approach, I could see the right fuel dump valve spraying for about 10 seconds (couldn’t see the left one).
Anyone got an idea why? Crew used the wrong switch by accident?


#2

Perhaps over max landing weight and decided to dump than circle?


#3

I doubt they were dumping fuel.


#4

Sure it wasn’t just vapor trails from the flaps?

Like in this photo?

gallery.millerworks.net/Travel/P … 8w-M-1.jpg


#5

I could clearly see that something was coming out from the fuel dump (jettison) valve:
http://s13.postimage.org/5zv3vvaw5/A330_243_B_6091_wing_w_fuel_dump_valve.jpg
I had taken this picture from my seat before the flight.

The incident took only a few seconds - the valve was only dripping a little bit when I had my camera out. But, it definitely looked like in this picture: http://upload.wikimedia.org/wikipedia/commons/thumb/c/cf/FuelDumpA340-600.JPG/797px-FuelDumpA340-600.JPG.

On a side note, have a look at an Airbus overhead panel:
avsim.com/pages/0108/Airbus2/pic_05_12.jpg
The fuel jettison buttons are placed the middle of the left panel.

Now compare to this (supposed to be from a 767-300):
contrailscience.com/skitch/Overh … 103650.jpg

Given Airbus’ rather inconspicuous fuel jettison buttons, could it be the pilot hitting these buttons by accident?

What happens in the cockpit when you do that, is there a warning?