Geoff, almost right. Each pump is connected to it's individual gearbox drive by a plastic vespel spline (so there are two vespel splines, one for each pump).
There was an issue with the design (now corrected) that led to the vespel spline wearing and then slipping, therefore one of the two pumps lost drive and therefore pressure. There was never a case of both pumps failing as the drive systems are separate (redundant).
Last edited by Variable Load; 10th Nov 2012 at 05:52.