Airbus A340 - Fuel system

Once refueling is finished, the END light flashes first and then stays on.

False.

True.

Correct! Wrong!

Once refueling is finished, the END light stays on.

As long as FUEL JETTISON p/b are selected ON:

FCMC 1 and 2 are unusable.

All X-Feed valves are opened and all stand-by fuel pumps are running.

Fuel JETTISON is in progress.

Correct! Wrong!

Maintenance panel - The END light flashes when:

the refueling process is approaching to the end, when electrical power degraded

Refueling is aborted.

Refueling is aborted, when the high level test is negative.

Correct! Wrong!

Automatic refueling ensures that:

Any tanks that require refueling, start to be refueled simultaneously.

May take as long as one hour using both refuel panels if all tanks are to be filled.

INNER tanks are filled first, followed by CTR and TRIM tanks.

Correct! Wrong!

Refueling Control Panel - The HI LVL light comes on blue, when:

High level is detected (i.e. both high level sensors are wet). The corresponding refuel valve automatically closes.

High level is detected. All corresponding refuel valve automatically close.

High level is detected (at least one high level sensor is wet)

Correct! Wrong!

The fuel level sensing data is independent of the fuel quantity indication, therefore even in the case of fuel system erroneous computation, the fuel level warnings are still valid.

False.

True.

Correct! Wrong!

In case of loss of both Fuel Control Monitoring Computers (FCMCs):

Auto trim is lost.

The FE part is in charge of fuel transfer.

Fuel transfer is to be made manually.

Correct! Wrong!

After refueling to maximum tank capacity, fuel can expand by:

4 % (20 °C temperature increase) without spillage.

2 % (20 °C temperature increase) without spillage.

5 % (20 °C temperature increase) without spillage.

Correct! Wrong!

The Airbus A340 fuel system:

Has two inner tanks divided into three parts which are normally interconnected.

Stores fuel in center tank, wing tanks and the trimmable horizontal stabilizer tank.

Has surge vent tanks in the outer, inner, center and trim tanks.

Correct! Wrong!

There are two fuel pumps in each collector cell. They are normally selected On and:

One is running and one is in stand-by.

Both are running.

One is running and one is in stand-by alterning every flight.

Correct! Wrong!

In case of "ALL ENGINES FLAME OUT":

All X-Feed valves open automatically and main fuel pumps keep running.

Main Fuel Pumps are still running.

All X-Feed valves open automatically.

Correct! Wrong!

Electrical power requirements for refueling are:

AC from external power or APU.

Battery power is sufficient.

DC from external power or APU.

Correct! Wrong!

The A340 fuel system inner tanks:

Are divided into two parts each, which may be isolated.

Are divided into four cells each.

Maintain equal fuel quantity by gravity.

Correct! Wrong!

The trim tank transfer system controls the aircraft's Center of Gravity (CG). The system either transfers fuel to the trim tank (aft transfer) or from the trim tank (forward transfer).

False.

True.

Correct! Wrong!

This movement of fuel changes the aircraft's CG. When the aircraft is in cruise, the system optimizes the CG position to increase fuel economy by reducing drag. Normal operation is automatic, but the crew can manually select a forward fuel transfer. The Fuel Control and Monitoring Computer (FCMC) calculates the aircraft's CG and compares it to a target value. This target depends on the aircraft's actual weight. Based on this calculation, the FCMC determines the quantity of fuel to be moved aft or forward in flight.

X-FEED valves 1 and 2 open in the event of aft transfer from the inner tanks.

True.

False.

Correct! Wrong!

X-FEED valves 2 and 3 open in the event of aft transfer from the inner tanks.

Magnetic level indicators are fitted in the lower surfaces of the center and wing tanks to allow the manual measurement of each tank's fuel quantity.

True.

False.

Correct! Wrong!

The normal fuel JETTISON is stopped when:

Below 5000 ft AGL.

The ARM and ACTIVE JETTISON p/b are set to Off or an inner tank low level is reached.

When the landing gear is selected to DOWN

Correct! Wrong!

The wings have inner and outer tanks. Each inner tank contains two collector cells that:

Maintain a fuel reservoir for the fuel booster pumps.

Maintain a fuel reservoir for the fuel booster pumps and provide negative 'g' protection to feed the engines. The two collectors cells maintained full and contain about 1 000 kg (2 200 lb) of fuel.

Maintain a fuel reservoir for the fuel booster pumps and provide negative 'g' protection to feed the engines.

Correct! Wrong!

In case of Fuel Center Pumps fault:

Center Tank fuel is transferred to Inner tanks by gravity and totally usable.

Center Tank fuel is unavailable.

Center Tank fuel is transferred to the Inner by gravity and is only partly usable.

Correct! Wrong!

The fuel system is controlled by:

Two Fuel Control and Monitoring Computers (FCMC).

Two Fuel Control Units (FCUs) Computers.

One Fuel Control Unit (FCU) and two Fuel Control and Monitoring Computers (FCMC).

Correct! Wrong!

Fuel is simultaneously jettisoned only from the trim and the center tanks.

True.

False.

Correct! Wrong!

Fuel is simultaneously jettisoned from the trim, inner and the center tanks.

Inner Tank Pumps - During normal operation, all main pumps run. If a main pump fails, or is switched off, then the standby pump of that inner tank runs. With the crossfeed valves open, one pump is capable of supplying all four engines in cruise.

True.

False.

Correct! Wrong!

With tanks nearly empty, time for refueling all the tanks of the aircraft is approximately:

60 minutes.

30 minutes.

20 minutes.

Correct! Wrong!

In normal operation, the automatic control of CG is ended:

When below FL 210 and speed < 280 kt (safety valves).

It is never ended because there is always fuel in tank and CG always changes.

During descent at FL 245 or 35 minutes (75 minutes if trim tank transfer pump has failed) prior to destination.

Correct! Wrong!

In normal conditions, the automatic control of CG is starting:

When landing gear is up and slats in.

Only if there is fuel in the trim tank at takeoff.

When crossing FL 255 during climb to reach AFT CG target minus 0.5%.

Correct! Wrong!

When a tank fuel temperature is displayed amber:

FWC 1 or 2 alerts pilots to apply special procedures.

FQI is degraded.

FCMC 1 is no more usable and FCMC 2 is automatically selected.

Correct! Wrong!

FAULT lights up on both CTR Tank P/Bs when:

The automatic CTR to INNER transfer has failed.

At least one CTR Pump has failed.

The CTR tank is empty.

Correct! Wrong!

FUEL FEED WITH ALL ENGINES FLAME OUT (ELEC EMER CONFIG) - When the speed goes below _____ kt, or when LAND RECOVERY is selected ON, all MAIN and STBY pumps are lost.

260 kt.

240 kt.

250 kt.

Correct! Wrong!

Refueling can be accomplished:

From the left side between engines 1 and 2.

Simultaneously from the right and left sides of the aircraft.

From the right side between engines 3 and 4.

Correct! Wrong!

In normal operation, engines are always fed from:

Center tank for takeoff.

Inner tanks.

Outer tanks in case of overfull condition.

Correct! Wrong!

Quiz

Airbus A340 - Fuel system

Once refueling is finished, the END light flashes first and then stays on.

As long as FUEL JETTISON p/b are selected ON:

Maintenance panel - The END light flashes when:

Automatic refueling ensures that:

Refueling Control Panel - The HI LVL light comes on blue, when:

The fuel level sensing data is independent of the fuel quantity indication, therefore even in the case of fuel system erroneous computation, the fuel level warnings are still valid.

In case of loss of both Fuel Control Monitoring Computers (FCMCs):

After refueling to maximum tank capacity, fuel can expand by:

The Airbus A340 fuel system:

There are two fuel pumps in each collector cell. They are normally selected On and:

In case of "ALL ENGINES FLAME OUT":

Electrical power requirements for refueling are:

The A340 fuel system inner tanks:

The trim tank transfer system controls the aircraft's Center of Gravity (CG). The system either transfers fuel to the trim tank (aft transfer) or from the trim tank (forward transfer).

X-FEED valves 1 and 2 open in the event of aft transfer from the inner tanks.

Magnetic level indicators are fitted in the lower surfaces of the center and wing tanks to allow the manual measurement of each tank's fuel quantity.

The normal fuel JETTISON is stopped when:

The wings have inner and outer tanks. Each inner tank contains two collector cells that:

In case of Fuel Center Pumps fault:

The fuel system is controlled by:

Fuel is simultaneously jettisoned only from the trim and the center tanks.

Inner Tank Pumps - During normal operation, all main pumps run. If a main pump fails, or is switched off, then the standby pump of that inner tank runs. With the crossfeed valves open, one pump is capable of supplying all four engines in cruise.

With tanks nearly empty, time for refueling all the tanks of the aircraft is approximately:

In normal operation, the automatic control of CG is ended:

In normal conditions, the automatic control of CG is starting:

When a tank fuel temperature is displayed amber:

FAULT lights up on both CTR Tank P/Bs when:

FUEL FEED WITH ALL ENGINES FLAME OUT (ELEC EMER CONFIG) - When the speed goes below _____ kt, or when LAND RECOVERY is selected ON, all MAIN and STBY pumps are lost.

Refueling can be accomplished:

In normal operation, engines are always fed from: