Originally Posted by
Redstone
No. Simply because once a jettison is initiated a control relay is energised thereby activating the O/J pumps. You have to remember this is a "2 man crew", no flight engineer to organise and concentrate on such operations. Once the jettison is initiated the crew would dial in a "fuel to remain" figure which will then be the point at which the jettison ceases. If the O/J pumps are not allready selected on, then they will be comanded to on.
Sorry, but I disagree. On a 744, the O/J pumps need to be manually armed. Automatics can control the wing O/J pumps, but not if they are manually selected OFF. The CWT pumps are purely manual.
Perhaps you were thinking of another aircraft type? 767?
(Edit) Despite the absence of an F/E, we can assume that the pumps will be in a normal configuation for the fuel on board (i.e. all pumps manually selected on in tanks with fuel in them). EICAS messages will advise the crew to take action if the tanks become empty.
Regards.
NSEU