Fuel synoptic, pump logic and thresholds
Fuel load
Compare total fuel and the two wing tank quantities with the EFB load and the plan. Verify the units shown in the aircraft.
Open the FUEL synoptic
Inspect quantities, pumps, valves and flow lines together.
Read tank quantity, valve positions, pump indications and the fuel lines. FSS says green lines indicate pressure and white lines indicate no pressure. The page also shows total fuel used and temperature measured in the left tank.
Pump AUTO logic
FSS describes the pump AUTO setting as allowing automatic operation according to system logic. It does not mean that every pump must run continuously.
Engine fuel flow
The FSS checklist calls for a fuel-flow indication at 20% N2 but does not identify which display. Separately, the FUEL synoptic page says its lines normally show no flow below 60% N2, while EICAS has a numerical engine fuel-flow indication. During a 1.1.0 hot start above 120°C ITT, dry motoring delays fuel introduction until the engine cools. Compare the actual indications with N2, ITT and CAS.
Tank imbalance
Compare the wing tanks during flight. If a discrepancy develops, identify its direction and review applicable indications and procedures before changing a selector.
Fuel indications after a change
Monitor quantities, the valve state, pump state and engine indications. Return to the appropriate normal configuration when the situation and procedure call for it.
An imbalance, a fuel leak and a faulty indication are different situations. This overview does not replace the applicable simulator procedure.
On the FUEL page, the jet-pump symbol is green when the jet pump is active and white when it is inactive. Read the flow lines separately: FSS uses green for a pressurised line and white for an unpressurised line. FSS FUEL synoptic [108].
On EICAS, read the left and right tank quantities separately; the total appears in a grey box. FSS describes green, amber and red quantity indications for normal, cautionary and low-fuel ranges. Check the numbers as well as the colour. FSS fuel and oil indications [109].
The FSS limitations list single-tank amber and red indications at 600 kg and 300 kg, and dual-tank indications at 1,200 kg and 600 kg respectively. These are indication thresholds, not a fuel-planning target. Check the aircraft variant, units and available fuel against the flight plan. FSS limitations [10]. [108] [109]