Block 3 Fuel System

Question 1

What are the 5 Fuel Tank Groups on the P8?

Answer 1

Main Tank 1
 Main Tank 2
 Center Tank(3)
 Forward Tank Group(4,5,6)
 Aft Tank Group(7,8,9, 10)
And 2 surge tanks

Question 2

What system allows fuel to be supplied from any tank to any engine?

Answer 2

Cross Feed System

Question 3

How many boost pumps are in each of the main tanks?

Answer 3

Each Main Tank has 2 boost bumps.
Main 1
Main 2
Center-used first because it supplies fuel at slightly higher pressure

Question 4

The Auxiliary tanks and Integral tank do not have boost pumps, what causes fuel to move from these tanks to the center tank?

Answer 4

Pressure Differential

Question 5

What’s the Fuel capacity of Main Tank 1?

Answer 5

1265 gallons

Question 6

What’s the Fuel capacity of Main Tank 2?

Answer 6

1266 gallons

Question 7

What’s the Fuel capacity of the Center Tank?

Answer 7

4299 gallons

Question 8

What’s the Fuel capacity of the Forward Tank Group?

Answer 8

1507 gallons

Question 9

What’s the Fuel capacity of the Aft Tank Group?

Answer 9

2520 gallons

Question 10

What is the total fuel capacity of the P-8A?

Answer 10

10,856 gallons

Question 11

What does the Forward Tank Group consist of?

Answer 11

3 interconnected body tanks (one master and two extension tanks).

Question 12

What does the Aft Tank Group consist of?

Answer 12

3 body tanks and 1 integral tank which are interconnected to act as one fuel tank.

Question 13

What is the pressure refueling system used for?

Answer 13

Refueling all tanks and for fuel transfer from tank to tank and for defuel.

Question 14

What functions does the Fuel storage have?

Answer 14

1. Holds fuel for engine and apu
2. Supplies fuel to the engine.
3. Supplies fuel to the APU
4. Provides venting for the Fuel tanks.
5. Provides sump drains for the Fuel tanks.

Question 15

Any wing fuel tank can supply fuel to the APU utilizing what?

Answer 15

Fuel Boost Pump Switches

Question 16

What component provides Air to Air refueling for the P-8A during flight?

Answer 16

Universal Aerial Refuel Receptacle Slipway Installation (UARRSI)

Question 17

What’s the purpose of the defuel system?

Answer 17

It removes fuel from the Fuel Tank to the refuel station and also permits fuel transfers between fuel tanks.

Question 18

State the purpose of the Fuel Quantity Indicating System. (FQIS)

Answer 18

It measures fuel weight in the fuel tanks

Question 19

State the purpose of the Fuel temperature Indicating System.

Answer 19

It measures the Fuel temperature in the main tanks and center tank.

Question 20

What is the purpose of the On-board Inert Gas Generation System?

Answer 20

It supplies Nitrogen enriched air (NEA) to all of the tanks.

It also ensure a 9% maximum oxygen concentration during flight.