1.7 Fuel System

Question 1

What is the total usable internal fuel capacity?

Answer 1

1200 lb

Question 2

What is the total unusable fuel capacity?

Answer 2

50 lbs

Question 3

What are the fuel tanks in the wings? How does fuel flow in the wings?

Answer 3

1 Integral Wing Tank on each side –> 1 Collector Tank on each side through a series of flapper valvues.

Question 4

How can the wing tanks be refueled?

Answer 4

• Through gravity refueling at the top of each wing

- Through pressure refueling (Max 50 psi)

Question 5

Where does fuel go after the collector tank?

Answer 5

To the aerobatic tank and then on to the engine compartment

Question 6

What is the capacity of the aerobatic tank and what is its purpose?

Answer 6

23 lb

- Purpose is to allow a continuous supply of fuel to the engine under negative g for 45s.

Question 7

After a period of negative g flight, how long under positive g must it take for the aerobatic tank to be completely refueled?

Answer 7

The same amount of time under positive g.

Question 8

What is the general flow of fuel in the aircraft?

Answer 8

Wing tank –> Collector tank –> Aerobatic tank –> Engine

Question 9

What pumps deliver fuel from wing tanks to collector tanks?

Answer 9

2 Transfer ejector pumps in each integral wing tank

Question 10

What pump delivers fuel from collector tank to aerobatic tank?

Answer 10

Engine feed ejector pump

Question 11

How many booster pumps are there and where are they located?

Answer 11

2, one in each collector tank

Question 12

When do the booster pumps operate?

Answer 12

1) During engine start
2) When inlet pressure to engine driven pump is low
3) When fuel filter is blocked
4) TO refill the aerobatic tank after inverted flight of more than 5 seconds

Question 13

At what fuel imbalance will the FCMC turn on one booster pump to feed fuel into other tank?

Answer 13

55 lb between each wing

Question 14

At what fuel imbalance will the FCMC stop autobalancing?

Answer 14

121 lbs as there may have been a fuel leak

Question 15

How are the booster pumps controlled?

Answer 15

Through PUMP L and PUMP R switch on left console

Question 16

Where does fuel flow after the aerobatic tank?

Answer 16

Aerobatic tank –> Maintenance shut off valve –> Fuel Filter

Question 17

After the fuel filter where does fuel flow? How is this controlled?

Answer 17

• Through the Firewall Shut-Off Valve (SOV).

- By FUEL HYD CUTOFF handle

Question 18

What does the FUEL HYD CUT OFF Handle do?

Answer 18

It shuts the Firewall shut off valve, stopping fuel supply to the engine and hydraulic fluid to the engine bay.

Question 19

After the firewall shutoff valve, where does the fuel go?

Answer 19

To Low-Pressure Fuel Switch which senses the fuel pressure

Question 20

After low pressure fuel switch, where does the fuel go?

Answer 20

To Engine driven fuel pump

Question 21

What does the engine driven fuel pump do?

Answer 21

It delivers fuel up to 3200 lb per hour to the engine

Question 22

When will a FUEL L LOW or FUEL R LOW caption come on on the MFD?

Answer 22

When fuel in the tank has reached approximately 70 lb.