FSX Default B737-800 Flight Director Fix flight2000it 15 years ago FSX Default B737-800 Flight Director Fix. This revised B737_800.cab will fix the vertical ‘roll’ needle of the flight director on the default FSX Boeing 737-800. Without the fix the needle does not move properly. By Matt Smith. 2 Mb FSX – B737 Head-Up Guidance System (HGS) Model 2350FSX – Boeing 737-800 Navy P8 PoseidonFSX Missions – Alitalia B737-800