Some hints on fuel tank loading sequence

Tips, instructions and other information on adding your selected aircraft type to the vroute's fuel calculator

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Michal Rok
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Some hints on fuel tank loading sequence

Post by Michal Rok » Sun Jul 06, 2008 8:53 am

The following airticle is intended to help you fill the fuel tank loading sequence in vroute's fuel data page. You will get access to this page for a particular aircraft type once you contact us with the required information (see viewtopic.php?f=12&t=356).

How does the fuel loading work

The fuel loading sequence is needed by vroute to convert the amount of fuel derived from calculations into clear instruction to the ground crew - how much fuel to put in each tank. Since different aircraft have different sequences of loading their tanks, not to mention having as many as 9 different tanks (i.e. 747), vroute needs to know the recommended procedure for filling up.

Let's start with a very simple example - ATR 72 by Flight1.

Image

The columns represent:
- the common name of a fuel tank
- total capacity of the tank
- the loading priority
- the amount of fuel to load at this particular priority (in most cases, equal to total capacity)

Using the above data, vroute will load equal amount of fuel into each tank - left and right, 5602 lbs each.

Another, more sophisticated example - Boeing 737-600 by PMDG:

Image

The priorities work as follows:
- first, all priority 1 tanks are loaded, if multiple tanks have the same priority, they will be loaded to the same level
- then, priority 2 are loaded
- and so on, until all tanks are full or the amount of fuel to be loaded matches the amount of fuel in tanks

Finally, a hard core example:

Image

Here, for the first time we introduce a "priority B" concept. The double priority system works as follows:

- first, all priority A = 0 are loaded, but only up to "capacity at priority A"
- then, all at priority B = 0 are loaded, up to "capacity at priority B"
- the process repeats for priority = 1 and so on

The important thing to understand is that B744 has the procedure of filling some tanks level (left + left aux + right + right aux), but when two aux tanks are full, the loading continues with left + right tanks until they are full. The above table represents this process.

snailer
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Re: Some hints on fuel tank loading sequence

Post by snailer » Sun Jul 06, 2008 11:16 am

Persons with PMDG B744 does not has to realy know this since PMDG had taken care of this with their own Fuel load utility. A total amount will do.

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Michal Rok
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Re: Some hints on fuel tank loading sequence

Post by Michal Rok » Sun Jul 06, 2008 1:38 pm

Sure, but vroute's feature is useful also for other B744 variants - which might or might not be equipped with similar load tool.


Michal

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