Airbus A340 - Fuel system

When a tank fuel temperature is displayed amber:

FQI is degraded.

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

FWC 1 or 2 alerts pilots to apply special procedures.

Correct! Wrong!

The A340 fuel system inner tanks:

Are divided into four cells each.

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

Maintain equal fuel quantity by gravity.

Correct! Wrong!

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

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

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

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

Correct! Wrong!

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

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

When landing gear is up and slats in.

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

Correct! Wrong!

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.

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

Fuel JETTISON is in progress.

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

FCMC 1 and 2 are unusable.

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 alterning every flight.

One is running and one is in stand-by.

Both are running.

Correct! Wrong!

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

The FE part is in charge of fuel transfer.

Auto trim is lost.

Fuel transfer is to be made manually.

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.

250 kt.

240 kt.

Correct! Wrong!

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.

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.

In normal operation, engines are always fed from:

Center tank for takeoff.

Outer tanks in case of overfull condition.

Inner tanks.

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).

True.

False.

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.

The fuel system is controlled by:

Two Fuel Control Units (FCUs) Computers.

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

Two Fuel Control and Monitoring Computers (FCMC).

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!

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

At least one CTR Pump has failed.

The CTR tank is empty.

The automatic CTR to INNER transfer has failed.

Correct! Wrong!

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

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

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.

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!

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

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

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.

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!

Electrical power requirements for refueling are:

AC from external power or APU.

DC from external power or APU.

Battery power is sufficient.

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.

True.

False.

Correct! Wrong!

In case of "ALL ENGINES FLAME OUT":

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

All X-Feed valves open automatically.

Main Fuel Pumps are still running.

Correct! Wrong!

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.

False.

True.

Correct! Wrong!

Refueling can be accomplished:

From the right side between engines 3 and 4.

From the left side between engines 1 and 2.

Simultaneously from the right and left sides of the aircraft.

Correct! Wrong!

In case of Fuel Center Pumps fault:

Center Tank fuel is unavailable.

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

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

Correct! Wrong!

Automatic refueling ensures that:

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.

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

Correct! Wrong!

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!

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

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

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.

Correct! Wrong!

The normal fuel JETTISON is stopped when:

When the landing gear is selected to DOWN

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

Below 5000 ft AGL.

Correct! Wrong!

Quiz

Airbus A340 - Fuel system

When a tank fuel temperature is displayed amber:

The A340 fuel system inner tanks:

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

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

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

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

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

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

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.

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

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

In normal operation, engines are always fed from:

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).

The fuel system is controlled by:

Maintenance panel - The END light flashes when:

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

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

The Airbus A340 fuel system:

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

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

Electrical power requirements for refueling are:

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 "ALL ENGINES FLAME OUT":

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.

Refueling can be accomplished:

In case of Fuel Center Pumps fault:

Automatic refueling ensures that:

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.

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

The normal fuel JETTISON is stopped when: