Random Questions

Question 1

At what % N2 does the ECY command the FCU fuel solenoid shutoff valve to open? (i.e. introduce fuel?)

Answer 1

7.3% N2

Question 2

What difference in fuel pressure on either side of the fuel filter triggers a ‘Fuel IMP Bypass’ Caution to be displayed?

Answer 2

4psi

Caution extinguishes below 2psi

Question 3

What makes up the LP rotary group on the FJ44-4A QPM engines?

Answer 3

Single stage Fan

Three stage axial intermediate pressure compressors

Question 4

What makes up the HP rotary group on the FJ44-4A QPM engines?

Answer 4

Single stage centrifugal compressor

Question 5

Why is there a bleed valve between the axial IP compressor and the centrifugal HP compressor?
When is it open and closed?

Answer 5

Axial IP Compressor provides too much flow at low engine rpm so it is scheduled to open during acceleration, deceleration and power settings below 75.2% N2 and close above 77.7% N2