Fuel

Question 1

What is the maximum amount of fuel we can carry (6.7 lbs/gallon) AOM II 12-9

Answer 1

359,414 lbs

Question 2

Question # 92 Fuel Configuration is skipped here; its too long.

Answer 2

Ok

Question 3

Question #93 Fuel Jettison is skipped here… also too long.

Answer 3

Damn it, Ok.

Question 4

What is the difference between TOTAL and CALCULATED FUEL? AOM II 11-131

Answer 4

Total Fuel is what the Fuel Quantity system is reading in the tanks (totalizer adds individual tank quantity indications).
Calculated Fuel is is a calculation of the fuel that SHOULD remain based on how much the engines have used (totalizer value at first engine start minus fuel used based on fuel flow rates and time).
Calculated Fuel is normally more accurate and used for fuel check, as individual quantity indicators can fluctuate slightly with changes in pitch/acceleration and turbulence.

Question 5

When are the values of Total Fuel and Calculated Fuel different? AOM II 11-131

Answer 5

A fuel leak will make these values differ significantly. (Slight variation is normal, especially with extended operation with gear and flaps down)

Question 6

Prior to engine start with useable fuel in the CWT, after fuel pump configuration are the #2 & #3 override/jettison pumps on or armed? AOM II 11-131

Answer 6

Armed (though the switches are ON).

Question 7

What is the max fuel imbalance between 1 & 4? 2 & 3? AOM II 12-18

Answer 7

1 & 4 = 3,000 lbs
2 & 3 = 6,000 lbs
FUEL IMBAL 1 & 4/2 & 3 comes on.

Question 8

What is the purpose of the #1 & #4 transfer valves? AOM II 12-14

Answer 8

A) Open to allow gravity transfer from outboard to inboard main tanks. Will transfer until approx 7,000 lbs remain in each outboard tank.
B) Automatically open during jettison when main tanks 2 & 3 have 20,000 lbs.
C) Valves may be opened manually using the Fuel Transfer Main 1 & 4 switch on the overhead panel, but this is normally just a MX function to correct imbalances on the ground.

Question 9

Does the flow bar disappear in the Cross Feed #2 & #4 Transfer Valves? AOM II 12-1

Answer 9

NO.
The flow bar just means that the valve is controlled by system logic, not necessarily that it is open.

Question 10

After positioning the Fuel Jettison selector to A or B, where does the “FUEL TO REMAIN” value display? AOM II 12-16

Answer 10

It replaces “Fuel Temp” on primary EICAS.

Question 11

Once activated, how long will the scavenge pump activate? AOM II 12-15

Answer 11

120 minutes or until the pump senses low pressure.