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[REPORTED] APU can be started with 0 lbs of fuel, VEN position, brake accum


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Posted

I was trying to push a firetruck on a parking area (using afterburners) after mission and ran out of fuel. Then I was able to start APU after engines shut down. Engines did not start anymore though.

 

When shut down both engines with fire sw, the VEN (nozzle) did not close on right engine.

 

Brake accumulator should deplete when at least right engine is off, the parking brake handle is pulled emerg and braking with pedals few times.

 

Cheers...

Posted (edited)

Clearly I'm a bad in AAR and have bad fuel economy, because here is one more bug of what happens after running out of fuel. Noticed that when both engines were shut down (when on air) the TEFs managed their way to FULL position. That should be impossible because there is no hyd pressure anymore.

Edited by uunilenkki
  • ED Team
Posted
That should be impossible because there is no hyd pressure anymore.

 

Were engines windmilling and were their RPM greater than 40? If so, it's not a bug.

Posted (edited)
Were engines windmilling and were their RPM greater than 40? If so, it's not a bug.

 

Did not pay attention on that, but hyd pressure gauge showed 0psi for both systems. At least at that point they should come up again as airflow is pushing them. It could be though that the hyd pressure gauge needs ac power.

 

Another thing I noticed the IFEI does not show fuel amount when batt sw is set on (not oride), it should.

Edited by uunilenkki
Posted

Well, shut down engines midair today, and paid attention to the engine rpms. Right after shutting them down rpms were over 40 but after a while rpms were like 13. Does that make enough hyd pressure to keep the TEFs down?

  • ED Team
Posted
It could be though that the hyd pressure gauge needs ac power.

 

Yes, you are correct. Hydraulic pressure indicators require AC power.

 

Another thing I noticed the IFEI does not show fuel amount when batt sw is set on (not oride), it should.

 

If only 28 VDC battery power is applied, IFEI shows on;y some of the engine parameters. So it is correct.

Posted (edited)

 

If only 28 VDC battery power is applied, IFEI shows on;y some of the engine parameters. So it is correct.

 

I know it shows fuel amount when batt on. On IFEI pressing MODE waiting for SP then pressing ET, it shows the fuel amount for a few seconds. And it should not read "0" after batt is switched on in fuel amount, it should be blank.

Edited by uunilenkki
Posted

I also noticed that the APU can still be started when the APU accumulator is depleted.

I'm not a hornet expert but as far as I can tell from the manual there is no hydraulic pressure to start the APU if that accumulator is depleted (hence the handpump to charge it).

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