AndrewB

Fuel Imbalance

Recommended Posts

Hi All,

 

I have complete 4 flights with the 747 and each time i get a Fuel imbalance yellow warning

 

here are the tank readings

 

Main 1 13.3

Main 2 9.8

Main 3 9.8

Main 4 13.3

 

No yellow lights on the overhead panel

 

Thanks

 

Andrew B

Share this post


Link to post
Share on other sites
Help AVSIM continue to serve you!
Please donate today!

 

 


I have complete 4 flights with the 747 and each time i get a Fuel imbalance yellow warning

 

This happens when you ignore the TANK/ENG warning on the EICAS.

 

When you see this, you will need to turn off the OVRD tanks on the inboard tanks, and then close the outer (unguarded) crossfeeds. The tutorial flight references this.

Share this post


Link to post
Share on other sites

This happens when you ignore the TANK/ENG warning on the EICAS.

 

When you see this, you will need to turn off the OVRD tanks on the inboard tanks, and then close the outer (unguarded) crossfeeds. The tutorial flight references this.

Got it 

 

thanks

Andrew

Share this post


Link to post
Share on other sites

I got this on my first flight. Quickly figured it out (I had just forgotten, in my haste). Reconfigured all engines to the tanks with the higher fuel level until it was evened out, and the imbalance warning went off, then went back to tank to engine mode.

Share this post


Link to post
Share on other sites

 

The imbalance does not go away. It remains. I tried different combinations. First the one Kyle said. Turn off OVRD tanks and outer unguarded Xfeeds.

Share this post


Link to post
Share on other sites

Peter, you are jumping onto an old thread without explaining your problem.  What are your tank readings and how are the pumps/xfeeds configured?

Basically, you pump fuel from the tank that has too much until it is drawn down to the level where all is balanced.

Share this post


Link to post
Share on other sites

Hi Peter,

In addition to Dan's post a few screenshots of the following would be useful:

_ Overhead fuel control panel

_ Upper EICAS (after pressing the RCL button on the DSP)

_ Lower EICAS on the fuel page

 

Also, if you are not familiar with the fuel management on the B747 (as it sounds from your post), the following may help you:

_ First:

_ FCOM, Fuel system operation, 12.20.13

_ FCOM, Supplementary procedure, fuel balancing SP.12.1

 

Share this post


Link to post
Share on other sites
2 hours ago, Piotr007 said:

 

The imbalance does not go away. It remains. I tried different combinations. First the one Kyle said. Turn off OVRD tanks and outer unguarded Xfeeds.

Of course it doesn't if you simply follow the procedure that I listed. The procedure that I listed is to prevent the imbalance and not solve it.

To clarify my above post:

Quote

 

This happens when you ignore the TANK/ENG warning on the EICAS.
Note that I am referring to the cause of the imbalance, and not the imbalance itself.

When you see this, you will need to turn off the OVRD tanks on the inboard tanks, and then close the outer (unguarded) crossfeeds. The tutorial flight references this.
"This" related to the first point (ignoring TANK/ENG) would of course be referring to the TANK/ENG warning on the EICAS.

 

 

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