tsufang@CI
Posts: 39
Joined: Mon Feb 18, 2002 8:38 pm

Fuel Transfer In 777

Wed May 08, 2002 5:53 pm

as the 777 maintenance manual said that if u want to transfer fuel u must open the cross valve and make the pump on (the quantity greater one) ,then open the defueling valve and control the refuel valve(on the refueling panel) which in the tank that u want to transfer to and u can make it
but i have a question i've see the fuel system schematic
and in according with the schematic if u make the jettsion system operation u just need to control the refueling valve then u can do the fuel transfer too...(because the jettsion nozzle valve will not open during ground)
could anyone tell me it's possible to do that?
thanks!!
 
cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: Fuel Transfer In 777

Wed May 08, 2002 8:44 pm

From what I know about the sys (or at least what I understand about it) is that when you push arm, the pumps in the L & R tanks operate along with the isol valves. The Ctr Jettison pumps wont operate with activation of the jettison arm sw...u must select them on.
So I suppose you could xfer fuel evenly from wing tanks to the center. But I don't see how you can xfer from left to right/right to left with both pumps with an output pressure on that same manifold.

And if you do turn a ctr pump on, then you've got 3 pump outputs on that manifold.
So I say it depends on the type of xfer you want to do.
If u wanna move 1000 lbs from each tank (L&R) to get 2000 lbs extra in the center (Don't know why you'd do that for any reason other than MX purposes), then you can use the jettison sys. But if you want to xfer from Left to right/rt to left or from Ctr to right or left - it doesn't look possible.

Who is online

Users browsing this forum: No registered users and 11 guests

Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos