Fuel System

Question 1

Maximum usable fuel

Answer 1

402 USG
2704 LBS
1521,5 L

Question 2

At what temperature and below prist is mandatory

Answer 2

0 degrees

Question 3

what are fuel vents for?

Answer 3

Maintaining internal pressure between -0.2 and 2,0 PSI

Question 4

Below what pressure does the caw’s light up?

Answer 4

Below 2 PSI

Question 5

First fuel filter
If the fuel filter is blocked, at what pressure will the fuel filter be bypassed?

And what will be the indication of the bypass

Answer 5

8 PSI
A red button will extend in the event of a filter bypass

Question 6

After passing through the air separator, the vapours are returned to the ______ ?

Answer 6

A vent line, with integral check valve, carries the vapors to the FCU spill return line trough which they are returned to the main fuel tanks

Question 7

What output pressure the low pressure EDP maintain ?

Answer 7

The pumps maintain 43.5 PSI outlet pressure , fuel in excess return to the inlet side and will be used to create motive flow

Question 8

Can the system work without the low pressure pumps?

Answer 8

Yes, an integral bypass valve allows fuel under boost pump pressure to bypass the low pressure pump during engine stars or in event of L EDP failure

Question 9

Oil and fuel , heat exchanger

Does the system manage the amount of fuel passing through the system or the amount of oil passing through the system?

Answer 9

Amount of oil passing through the system, and it’s controlled by a sliding valve and a thermal element

Question 10

Oil and fuel , heat exchanger

At what temperature does the valve start to close to let less oil through, and fully close at what temperature?

Answer 10

Begins to close at 21°C and fully close a 37 °C

Question 11

what’s the name of the system that prevents fuel from transferring from the collector tank to the main tanks?

Answer 11

Flapper-type check valve

Question 12

At what fuel level will the caw’s Light {LOW FUEL} light up?

Answer 12

Less than 20 USG
Or
75 liters

Question 13

how many fuel sensors are in the system?

Answer 13

4 sensors each wing

Question 14

Fuel system Operational summary

Answer 14

During normal operation with the engine running, each transfer jet pump transfer fuel from its respective main tank to a corresponding collector tank. From each collector tank, fuel is delivered to a common manifold by its associated delivery jet pump. (The transfer jet pump and delivery jet pumps are operated by motive flow)

From the manifold, fuel passes through the maintenance shut-off valve, fuel filter, air separator, and the firewall shutoff valve en route to the low pressure engine driven pump. From the L EDP , fuel is then routed through the oil-to-fuel heat exchanger and directed to the high pressure engine-driven pump which further increase fuel pressure and supplies the FCU