FUEL / FUEL POLICY

Question 1

• What is the max fuel imbalance for taxi, take-off and landing?
• Why would a fuel imbalance be a potential problem?

Answer 1

• 3000 lbs if total main tank is over 55’000 kg

4500 lbs if total main tank is less than 41’000 kg

• Because of the required lateral trim required will cause increased drag and fuel consumption
• The loads on the underweight wing will be more transferred through the root - in effect the airload on the light wing is having to help support the heavier wing, and that means loads transferring through the wing root which are higher than normal. Hence a possible fatigue effect.

Question 2

What fuel is the “fuel required” when in the air?

Answer 2

• Trip to destination + alternate fuel + reserve fuel
  or
• Enough to make to an ERA
  or
• Enough to destination with in-flight fuel reduction

Question 3

When doing if-flight fuel reduction, do you use the FMC figures or the flightplan figures?

Answer 3

FMC figures

Question 4

What is “Rec Extra fuel” and when is it to be loaded?

Answer 4

• Known or suspected WX avoidance
• Enroute ATC constraints
• Destination holding delays

Question 5

What is the minimum total amount that

Contingency, Mandatory and Rec Extra has to be?

Answer 5

1’500 kg or more

Question 6

What is the minimun total amount that

Alternate, Mandatory and Rec Extra has to be?

Answer 6

Has to be more than Reserve Fuel, to ensure approximately 1h of fuel on arrival

Question 7

How much fuel will be left in the main tanks after fuel jettison?

Answer 7

5’200 kg per main tank

Question 8

What is the maximum fuel you can have in the center tank with the wing tanks less than full?

Answer 8

1360kg

Question 9

Which fuels are not to be used for the B777?

Answer 9

JP4 and Jet B

Question 10

What is the minimum fuel you can depart with?

Answer 10

Trip+Mandatory+Altn+Reserves

Question 11

What actions could you do if you get FUEL QTY LOW?

Answer 11

• Crossfeed to ensure that fuel is available to both engines incase the low tank empties
• Fuel pumps ON, to ensure all available fuel is used

Question 12

When will FUEL QTY LOW appear? When will it disappear?

Answer 12

Appears at 2041 kg and disappears at 2200 kg

Question 13

Can a Captain decide to take CAT C fuel?

Answer 13

Yes, but he needs approval from line ops

Question 14

For in-flight fuel reduction, do you need two available runways after you started descent?

Answer 14

No, that is only before starting descent

Question 15

What is contingency fuel used for?

Answer 15

• Errors in forecast winds
• Altitude restrictions
• Minor route changes due ATC
• Extended taxi times
• Departure/arrival delays

Question 16

How much of the Contingency fuel would you expect to burn during a flight?

Answer 16

Contingency fuel in tons x Ramp correction

Question 17

When would you use a low or high Cost Index?

Answer 17

• Low: Maximum range. When low on fuel

- High: To garuantee an arrival before a curfew

Question 18

What is the definition of COST INDEX?

Answer 18

Cost of TIME divided by cost if FUEL

Question 19

What part of the flight is”OVERBURN” calculated from?

Answer 19

TOC to 150 nm from touchdown

Question 20

What does “HOLDING FUEL” refer to in the fuel efficiency section in theFlight Folder?

Answer 20

Fuel from the last 150nm to touchdown

Question 21

Define MANDATORY/ADDITIONAL FUEL

Answer 21

• At all times, when having a eng fail or depress, we must be able to divert to nearest suitable airport. If planned fuel is insufficient for that, mandatory/additional fuel is added
• Additional fuel to ensure that at all times during the flight there is enough fuel to:
• Fly to nearest suitable
• Hold for 30 min at 1500ft AAL
• Make an approach and land (500 kg)

Question 22

If you are over the North Pole and fuel looks like it’s below what you need. What can you do?

Answer 22

• Try to get directs
• Plan to land at ERA
• Use In-flight fuel reduction
• Set Cost Index to zero

Question 23

How far out from an airport would you consider using In-flght fuel reduction and why?

Answer 23

About 2h

Reason is so that you have a valid METAR

Question 24

What fuel burn would you use to do a gross error check on the CFP?

Answer 24

8 tons/h for the -300ER

Question 25

If you have to be 3,5 tons lighter for whatever reason, how do you calculate how much fuel and cargo to be taken off?

Answer 25

3,5 x RAMP CORR gives the reduced fuel burn. The rest is reduction in cargo