Fuel

Question 1

What is the AFM limitation for the fuel XFEED SOV?

Answer 1

Must be closed for takeoff and landing

Question 2

When does fuel transfer from the center tank to the wing tanks?

Answer 2

Wing tank quantity below 93% and continues until wing reaches full (3% of volume maintained for fuel expansion)

Question 3

Under which condition is a lateral fuel imbalance automatically corrected?

Answer 3

A wing imbalance of 400 lb (181 kg) and DC AUX pumps are not already running

Question 4

Which fuel tanks cannot be gravity refueled?

Answer 4

Forward or aft auxiliary tanks (XRS / 6000)

Question 5

Where is the fuel SOV located and how is the valve closed?

Answer 5

Located behind the aft pressure bulkhead. It is closed via the associated fire discharge handle.

Question 6

What is the fuel quantity at which fuel transfers automatically from the AFT auxiliary tank to the wing tanks?

Answer 6

When either of the wing tank quantities reduces to 5500 lb

Question 7

What does the COMPARE FUEL QUANTITY

indication in the FMS mean?

Answer 7

FMQGC and FMS fuel quantity differ by more than 2% BOW

Question 8

After an engine failure, why is the XFEED SOV opened?

Answer 8

To ensure balanced fuel use from both tanks avoiding any significant lateral fuel imbalance

Question 9

Is it permissible to takeoff and land with the XFEED SOV switch/light indicating OPEN?

Answer 9

No

Question 10

Which fuel pumps have no pilot control?

Answer 10

Center tank transfer pumps

Question 11

Why must manual operation of the wing transfer system be monitored?

Answer 11

Because no automatic shutdown or overfill protection is provided

Question 12

What is the purpose of the XFEED SOV?

Answer 12

Single engine feed from both wing tanks or both engines to be fed from a single tank

Question 13

What are two limitations associated with the fuel recirculation system?

Answer 13

Fuel recirculation is prohibited when using wide cut fuels, asymmetric operation is prohibited

Question 14

If use of the center / aft tank is planned, what is the minimum required tank load?

Answer 14

500 lb (230 kg) to ensure transfer pump reprime

Question 15

How is fuel automatically transferred to the center tank from the forward auxiliary tank? (XRS/6000)

Answer 15

Transfer ejector or gravity flow

Question 16

What is the power source for the refuel/defuel panel?

Answer 16

APU battery direct bus (to prevent APU battery drain, ensure the panel is selected OFF after use)

Question 17

What will happen if one or both AC boost pumps fail?

Answer 17

Onside DC AUX pump automatically operates, providing engine fuel feed pressure

Question 18

How is positive fuel tank pressure maintained during flight?

Answer 18

NACA scoops provide ram air

Question 19

Below which fuel temperature is takeoff prohibited?

Answer 19

Below +5°C is prohibited

Question 20

What is the maximum useable fuel load for the aft fuel tank on the XRS and 6000?

Answer 20

2300 lb (1025 kg)

Question 21

Under which combination of conditions does the fuel recirculation system automatically activate?

Answer 21

Above 34,000 ft and a single fuel temperature sensor below -20°C, or above 34,000 ft and an average of
all temperature sensors below -9°C

Question 22

What is minimum go-around fuel?

Answer 22

600 lb (266 kg) per wing with wings level and maximum climb attitude of 10° nose up

Question 23

Which wing tank normally provides fuel for the APU?

Answer 23

Right wing tank

Question 24

What is the maximum permissible fuel imbalance during flight?

Answer 24

1100 lb (488 kg)

Question 25

During the refuel SOV test, what does the SOV FAIL message indicate?

Answer 25

Fuel flow will not stop when the tank is full

Question 26

When should the operation of the pressure relief valves not be tested?

Answer 26

When associated wing tank is above 11,800 lb and center tank above 8,000 lb

Question 27

When do the two AC boost pumps in each wing tank operate?

Answer 27

Onside ENG RUN switch ON

Question 28

What is the maximum useable fuel load for the wing tanks when pressure refueling?

Answer 28

15,050 lb (6825 kg) per wing tank

Question 29

What is the maximum permissible fuel imbalance on ground and during takeoff and landing if the aircraft fuel
weighs less than 19,450 lb (8823 kg)?

Answer 29

1100 lb (488 kg)

Question 30

What is the maximum permissible fuel imbalance on ground and during takeoff and landing if the aircraft fuel weighs >20,250 lb (9186 kg)?

Answer 30

600 lb (266 kg)

Question 31

According to the AFM, which combination of two conditions

makes the aft tank fuel unusable?

Answer 31

Each wing does NOT contain at least 5500 lb (2495 kg) fuel at departure and planned cruise altitude is less than 30,000ft

Question 32

According to the AFM, which combination of two conditions

makes the center tank fuel unusable?

Answer 32

Each wing is NOT full at departure and planned cruise altitude is less than 30,000ft

Question 33

Under which three conditions would both DC AUX pumps

automatically operate?

Answer 33

Flap position greater than 0, in flight with landing gear down and locked, less than 600b in either wing

Question 34

Which four conditions inhibit an automatic wing fuel transfer?

Answer 34

Flap position greater than 0, in flight with landing gear

down and locked, low fuel condition less than 600lb wing, DC aux pump supplying fuel feed to eng(AC pump fail)