APU SOV has failed to open/close in 5s or less of command signal.

Wing fuel balance is out of the usual range.

Two channels of the fuel quantity conditioning unit have failed

Fuel quantity is 500 lb (226.80 kg) or less in one of the two wings, when the aircraft is in unaccelerated, level flight.

Left engine SOV has failed to open/close in 5s or less of command signal.

Quantity in left collector is less than 200 lb (90.72 kg) for a minimum of 10s with engine running.

The left fuel ejector failed to provide enough fuel pressure.

Left engine fuel pressure is low.

Left electric fuel pump has failed.

Right engine SOV has failed to open/close in 5s or less of command signal.

Quantity in right collector is less than 200 lb (90.72 kg) for a minimum of 10s with engine running.

The right fuel ejector failed to provide enough fuel pressure.

Right engine fuel pressure is low.

Right electric fuel pump has failed.

Fuel temperature in the wing is low (-38.2°C (-36.7°F)).

Wing fuel gravity cross-flow valve is not fully opened or closed as commanded.

FCU left or right channel has sensed a fault.

Fuel transfer valve is not opened/closed in 5s or less of command signal.

Left fuel pump is automatically turned ON.

Right fuel pump is automatically turned ON.

Fuel is balanced within 100 lb with the fuel transfer valve open.

Wing fuel gravity cross-flow valve is open.

Fuel transfer valve is open.

Left engine SOV is closed.

Left fuel pump is OFF.

Left fuel pump is ON.

Right engine SOV is closed.

Right fuel pump is OFF.

Right fuel pump is ON.