1FD2 means FD1 is supplying LHS PFD and FD2 is supplying RHS PFD.
1FD- means FD1 is supplying LHS and RHS FD is deselected
-FD2 means LHS FD is deselected and FD2 is supplying RHS PFD
1FD1 or 2FD2 means that one of the FMGC's has failed and that one is supplying both FD's.
Last edited by hph304; 20th Jun 2016 at 11:03.