Fuel System

Question 1

How is the engine feed jet pump activated?

Answer 1

By flow from the return line of the HMU.

Question 2

With the engine running, what does the FEED LO PR amber light on the fuel panel indicate?

Answer 2

Delivery pressure <4psi.
Pump failure (jet pump and electrical pump) or fuel starvation (leak).

Question 3

What does the amber LO LVL indication mean?

Answer 3

Fuel quantity <160kg; or

Fuel quantity >160kg and feeder tank not full.

Question 4

When does the electrical fuel pump automatically stop?

Answer 4

30 seconds after the engine feed jet pump is above 8.5psi.

Question 5

What does the blue FUEL XFEED flashing message on the memo panel mean?

Answer 5

Improper XFEED valve operation when:
Both electrical fuel pumps are ON; or
Both electrical fuel pumps are OFF; or
The electrical fuel pump in the tank with the higher quantity is OFF.

Question 6

Where is the actual fuel quantity displayed?

Where is the FMS generated fuel on board displayed?

Answer 6

MFD secondary engine display page.

EWD

Question 7

How is fuel transferred from the main tank to the feeder in the case of a feeder jet pump failure?

Answer 7

Through flappers

Question 8

When will the electrical pump start in the case of an engine feed jet pump failure?

Answer 8

Pressure <5psi