If you have the F-Pln sequenced as 737jock states and fly a downwind leg within 5nm of the FAT, the flightplan will sequence to the missed app. If there is no chance of you doing this then no problem, if there is then you have an issue. PPOS won't actually stop this happening...
(We have this issue routinely at LHR - Its a bum when you are on an RNAV approach!)
If I anticipate this happening, I leave a hold active whilst flying downwind. Once past the FAF, then I extend the centreline...
This is with FMS 2+...
Last edited by Cough; 6th Sep 2012 at 08:02.