Fuel

Question 1

Approximately how many gallons does each hopper hold?

Answer 1

190 gallons, 1283 lbs

Question 2

In addition to the hopper, how many fuel compartments in each wing?

Answer 2

6

Question 3

How many fuel drains are there on each side, and where are they?

Answer 3

3,

1 in the main portion of the wing tank,
1 in each hopper and
1 in each vent plenum.

Question 4

What powers each fuel pump?

Answer 4

Left Main - Left ESS DC Bus
Left Alt - Left Main DC Bus
Right Main - Left ESS DC Bus
Right Alt - Left Main DC Bus

Question 5

With the FUEL RETURN switch “ON”, what will shut off the system?

Answer 5

1. Crossflow valve OPEN
2. Engine at high power setting >2650 PPH
3. Fire Handled Pulled or Fuel control selected OFF
4. Low fuel pressure or low fuel quantity.

Question 6

After completing the FUEL System Test on the COP, the fuel tank temp is 6 degrees C. What will happen after engine start?

Answer 6

The Heated Fuel Return system will be active.

Question 7

What is the fuel capacity using gravity filler caps?

Answer 7

approx 43,650 lbs

Question 8

What happens to indications if the fuel tanks get overfilled?

Answer 8

If either tank exceeds 25,100 lbs, the readouts on the Engine instruments and synoptics will be amber dashes on the affected side and total quantities.

The FMS and SMC will show accurate numbers.

Question 9

Are you allowed to take more than 48,200 lbs?

Answer 9

Yes, as long as you don’t exceed 104,000 max ramp weight.

Question 10

What are the three ways the pressure fueling shutoff valve closes?

Answer 10

1. Fuel Quantity system when preselect amount is reached.
2. At the GSCP when AUTO REFUEL switch turned OFF
3. REMOTE FUELING SHUTOFF switch in COP.

Question 11

Where is the APU fuel shutoff valve and what powers it?

Answer 11

APU fuel line off the left tank, accessible thru the Left main wheel well.

Rt Battery bus or Lt ESS DC

Question 12

Where are the Engine Fuel Shutoff valves and what powers / Controls them?

Answer 12

Aft of the wing beam on each tank.

Right - Rt ESS DC
Left - Lt ESS DC

Respective fire handles.

Question 13

What’s the purpose of ventilation system in fuel tanks?

Answer 13

It protects from over and under pressurization by allowing air, fuel vapors, and fuel to move about or flow freely.

Question 14

What percentage of expansion is allowed in plenums?

Answer 14

about 2%

Question 15

What’s indicated if the red light illuminates on the refuel panel?

Answer 15

High level sensors are wet and Fuel Quantity Signal Conditioner has closed the respective fueling valve.

Question 16

What happens when REMOTE FUELING SHUTOFF switch is selected to CLSD?

Answer 16

Both pressure fueling shutoff valves close and CLSD legend illuminates in blue.

Question 17

What’s the warning associated with use of crossflow valve inflight to balance?

Answer 17

Always OPEN x-flow valve BEFORE turning OFF a boost pump on one side.

Question 18

There are several abnormal conditions which inhibit the heated fuel return system (e.g. pulled fire handle, low fuel pressure signal, low fuel quantity signal). What types of normal conditions inhibit this system from operating?

Answer 18

X-Flow valve open, or engine at high power settings

Question 19

What happens if both fuel boost pumps stop operating?

Answer 19

The engine will be able to suction feed below 20,000’. Above20,000, the engine will run erratically and flame out.

Question 20

What’s the purpose of the fuel ejector and how does it operate?

Answer 20

It keeps the hopper full. It’s a low-pressure, high-volume jet pump (using motive flow) with no moving parts.

Question 21

What’s the difference between the intertank and crossflow valve?

Answer 21

The intertank valve allows fuel to gravity flow btwn hoppers, the crossflow connects pump manifolds.

Question 22

What’s the capacity of each hopper?

Answer 22

190 gallons…approx 1270 lbs