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747 fuel panel

L

lh777

Messages
126
Country
italy
Hello,
I would like to realize the fuel panel of 747 in xml format.
I have a total of 7 more different crossfeed valves tanks. How do I determine in which order the fuel must be consumed?
For example if I have all full tanks the engines consume fuel only from the center tank.
 
FS has a default usage sequence for the fuel tanks. It will normally use that sequence. You can program a fuel use gauge to change that order (or force the user to do it manually), but it is not simple programming.
 
Literally I go crazy for the classics.
I would like to be able to realize 747 and 707.
The fuel panels work the same way in these bird.
I know their logic but do not know how to express it in xml
 
By default, FSX use wings tanks in first and ending by center tank. In my Airbus project, I had to write a gauge to manage fuel system, because, sequence in not the same in real life. On an Airbus, center tanks are used in first and after, this is wings tanks.

So, I wrote join a my gauge if that can help you. THis gauge is for A321 (2 engines, 3 center tanks, 1 wing main tank and 1 auxiliary tank per wing).

- I added a "reserve" in center1 tank (when a defined level is reached, gauge switch to wing tanks)
- when a defined low level in wing tanks is reached, there is an alarm
- crossfeed is manager : you can burn fuel from one of the wing tank to feed 1 or two engines : used after a engine fail to equilibrate aircraft.

Your panel must have Crossfeed switch and fuel pump switchs working :

Code: 
<!--
G:Var1 is low level flag center tank 1
G:Var4 is low level flag left wing main tank
G:Var5 is low level flag right wing main tank
-->
<FloatPosition>0.000,0.000</FloatPosition>
<Update Frequency="4">
    <Script>
        (* if fuel pumps stopped set selector on main central tank*)
        (A:FUEL TANK SELECTOR:1,enum) 0 !=
        (A:General eng fuel pump switch:1,bool) 1 != and
        (A:Fuel Cross Feed,bool) 0 == and if{ 1 (>K:FUEL_SELECTOR_OFF) }
        (A:FUEL TANK SELECTOR:2,enum) 0 !=
        (A:General eng fuel pump switch:2,bool) 1 != and
        (A:Fuel Cross Feed,bool) 0 == and if{ 1 (>K:FUEL_SELECTOR_2_OFF) }

        (* alarm activated if low level reached *)
        (A:Fuel Tank Center3 Quantity,Gallons) 5 &lt;= if{ 1 (>G:Var1) }
        (A:Fuel Tank Center2 Quantity,Gallons) 5 &lt;= if{ 1 (>G:Var2) }
        (A:Fuel Tank Center Quantity,Gallons) 500 &lt; if{ 1 (>G:Var3) }
        (G:Var1) 1 ==
        (G:Var2) 1 == and
        (G:Var3) 1 == and (A:Fuel left quantity,gallons) 250 &lt; and
        (A:Fuel Tank Selector:1,number) 2 == and
        (L:init_sound,bool) 1 == and if{ 1 (>L:CA_Sound13) 1 (>G:Var4) 1 (>L:Fuel Too low,Bool) }
        (G:Var1) 1 ==
        (G:Var2) 1 == and
        (G:Var3) 1 == and
        (A:Fuel right quantity,gallons) 250 &lt; and
        (A:Fuel Tank Selector:2,number) 3 == and
        (L:init_sound,bool) 1 == and if{ 1 (>L:CA_Sound13) 1 (>G:Var5) 1 (>L:Fuel Too low,Bool) }
        (* annulation alarme *)
        (A:Fuel Cross Feed,bool) 1 == if{ 0 (>L:Fuel Too low,Bool) }

        (* set to central tank 3 if it has some fuel  *)
        (G:Var1) 0 ==
        (A:FUEL TANK SELECTOR:1,enum) 8 != and
        (A:General eng fuel pump switch:1,bool) 1 == and if{ 8 (>K:FUEL_SELECTOR_SET) }
        (G:Var1) 0 ==
        (A:FUEL TANK SELECTOR:2,enum) 8 != and
        (A:General eng fuel pump switch:2,bool) 1 == and if{ 8 (>K:FUEL_SELECTOR_2_SET) }

        (* set to central tank 2 if it has some fuel and central 3 empty *)
        (G:Var1) 1 ==
        (G:Var2) 0 == and
        (A:FUEL TANK SELECTOR:1,enum) 7 != and
        (A:General eng fuel pump switch:1,bool) 1 == and if{ 7 (>K:FUEL_SELECTOR_SET) }
        (G:Var1) 1 ==
        (G:Var2) 0 == and
        (A:FUEL TANK SELECTOR:2,enum) 7 != and
        (A:General eng fuel pump switch:2,bool) 1 == and if{ 7 (>K:FUEL_SELECTOR_2_SET) }

        (* set to central tank 3 if it has some fuel and if central3 and central2 empty *)
        (G:Var1) 1 ==
        (G:Var2) 1 == and
        (G:Var3) 0 == and
        (A:FUEL TANK SELECTOR:1,enum) 6 != and
        (A:General eng fuel pump switch:1, bool) 1 == and if{ 6 (>K:FUEL_SELECTOR_SET) }
        (G:Var1) 1 ==
        (G:Var2) 1 == and
        (G:Var3) 0 == and
        (A:FUEL TANK SELECTOR:2,enum) 6 != and
        (A:General eng fuel pump switch:2,bool) 1 == and if{ 6 (>K:FUEL_SELECTOR_2_SET) }

        (* switch to wings tanks when central 1 is in reserve  *)
        (G:Var1) 1 ==
        (G:Var2) 1 == and
        (G:Var3) 1 == and
        (G:Var4) 0 == and
        (A:General eng fuel pump switch:1,bool) 1 == and
        (A:Fuel Cross Feed,bool) 0 == and
        (A:FUEL TANK SELECTOR:1,enum) 2 != and if{ 1 (>K:FUEL_SELECTOR_LEFT) }
        (G:Var1) 1 ==
        (G:Var2) 1 == and
        (G:Var3) 1 == and
        (G:Var5) 0 == and
        (A:General eng fuel pump switch:2,bool) 1 == and
        (A:Fuel Cross Feed,bool) 0 == and
        (A:FUEL TANK SELECTOR:2,enum) 3 != and if{ 1 (>K:FUEL_SELECTOR_2_RIGHT) }

        (* crossfeed : Right wing tank with right pump to feed left engine *)
        (G:Var1) 1 ==
        (G:Var5) 0 == and
        (G:Var2) 1 == and
        (G:Var3) 1 == and
        (A:General eng fuel pump switch:1,bool) 0 == and
        (A:Fuel Cross Feed, bool) 0 != and
        (A:FUEL TANK SELECTOR:1, enum) 3 != and if{ 18 (>K:FUEL_SELECTOR_LEFT) 15 (>K:FUEL_SELECTOR_SET) }

        (* crossfeed : left wing tank with left pump to feed right engine *)
        (G:Var1) 1 ==
        (G:Var4) 0 == and
        (G:Var2,number) 1 == and
        (G:Var3,number) 1 == and
        (A:General eng fuel pump switch:2,bool) 0 == and
        (A:Fuel Cross Feed, bool) 0 != and
        (A:FUEL TANK SELECTOR:2, enum) 2 != and if{ 18 (>K:FUEL_SELECTOR_2_RIGHT) 14 (>K:FUEL_SELECTOR_2_SET) }

        (* crossfeed : all tanks to all engines : starting *)
        (G:Var1) 1 ==
        (G:Var2) 1 == and
        (G:Var3) 1 == and
        (A:General eng fuel pump switch:1,bool) 1 == and
        (A:General eng fuel pump switch:2,bool) 1 == and
        (A:Fuel Cross Feed,bool) 0 != and
        (A:FUEL TANK SELECTOR:1,enum) 13 != and if{ 13 (>K:FUEL_SELECTOR_SET) 1 (>K:CROSS_FEED_OPEN)  }
        (G:Var1) 1 ==
        (G:Var2) 1 == and
        (G:Var3) 1 == and
        (A:General eng fuel pump switch:1,bool) 1 == and
        (A:General eng fuel pump switch:2,bool) 1 == and
        (A:Fuel Cross Feed,bool) 0 != and
        (A:FUEL TANK SELECTOR:2,enum) 13 != and if{ 13 (>K:FUEL_SELECTOR_2_SET) 1 (>K:CROSS_FEED_OPEN)  }
    </Script>
</Update>


at the end of this old video, you can see a exemple of the fuel managment with a fire engine (A320 with only one center tank). This video is old, panel was a beta version



Francois
 
Last edited:
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