Originally Posted by
PEI_3721
Any 146/RJ operators prepared to admit one of those 'Doh' moments when using the GNS fuel planning page as an inflight guide - 'how goes it', forgetting that the system requires manual updating.
Memory fades, but only part of the system, fuel contents or fuel flow, was automated.
Contents and fuel flow are both automated to an extent. Fuel flow is an automatic input and contents is manual input but fuel used is taken off to give fuel remaining automatically. Errors can be made inputing the contents either at the start of the flight or in flight if you feel the need to update them. Personally I only update the FMS fuel contents down. If the FMS contents is lower than the gauges then I leave it (within reason of course.)