Jump to content

Sign in to follow this  
rennman

X-Fer Pump fail

Recommended Posts

Hi...When the fuel level gets to about 25%...I get warnings that L Xfer pump fail and R Xfer pump fail.

I didn't see fuel management in the docs...

Any ideas?

Thanks.

Share this post


Link to post
Share on other sites

The way the real airplane works is this.  There are motive flow ejector transfer pumps in the main fuel tanks that fill a "hopper tank".  Fuel from the hopper tank is fed to the engines.  If the fuel level in the hopper tank falls below approximately 80 pounds, the Xfer Fail warning will illuminate.  That figure increases to 580 pounds if the main and auxiliary boost pumps are off. 

Here's the code from the Alabeo C441:

    <Element id="Gauge_Anum_L_LXFER_PUMP_FAIL">
    <FloatPosition>0.000,0.000</FloatPosition>
    <Visibility>
    (A:FUEL LEFT QUANTITY,gallons) 9 &lt;
    (A:GENERAL ENG FUEL PUMP SWITCH:1,bool) 0 ==
    (A:FUEL LEFT QUANTITY,gallons) 87.5 &lt; and or
    </Visibility>(* less 80 pounds + boost pump off or less 850 pounds + boost pump off *)    
        <Image id="Image" Name="Gauge_Anum_L_LXFER_PUMP_FAIL.bmp">
        <Transparent>True</Transparent>
        <Bright>false</Bright>
        </Image>
    </Element>

Assuming 6.8 pounds per gallon of jet fuel, the numbers should have been 11.75 gallons and 85.3 gallons respectively, but the functionality is correct. 

http://www.cessnaconquest.net/25/17.html

Share this post


Link to post
Share on other sites

does this mean i need to make sure the boost pumps are on to keep the warnings off?

 

thank for responding...

Share this post


Link to post
Share on other sites

Yes.  According to the Alabeo 441 checklist, the boost pumps are turned on prior to takeoff and turned off after shutdown.  It makes sense because without the pumps running the hopper tanks would not fill once the fuel level in the main tank got below the lip of the hopper tank. 

Share this post


Link to post
Share on other sites

thank you so much for taking the time to help...im flying the 441 around the world right now...

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

  • Tom Allensworth,
    Founder of AVSIM Online


  • Flight Simulation's Premier Resource!

    AVSIM is a free service to the flight simulation community. AVSIM is staffed completely by volunteers and all funds donated to AVSIM go directly back to supporting the community. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. Thank you for your support!

    Click here for more information and to see all donations year to date.
  • Donation Goals

    AVSIM's 2020 Fundraising Goal

    Donate to our annual general fundraising goal. This donation keeps our doors open and providing you service 24 x 7 x 365. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. We reset this goal every new year for the following year's goal.


    50%
    $12,655.00 of $25,000.00 Donate Now
×
×
  • Create New...