mikeclod
Posts: 270
Joined: Wed Dec 19, 2001 4:03 pm

B-747 Fuel Question

Mon Oct 21, 2002 3:10 pm

Hello, I'm looking for the tank designations, fuel quantity, fill order,and burn order for 747's.
Thanks, Mikeclod
P.S. in lbs. please.
 
Guest

RE: B-747 Fuel Question

Mon Oct 21, 2002 4:36 pm

Hola Mikeclod -
xxx
Sorry but I speak 747 Classic only... too old to learn to converse in 400 language...
But as you wish I will speak pounds... assuming 59 degrees F, 6.7 lbs/US.gal
xxx
For the sake of simplicity, I will talk basically of 200 and 300 series.
I will give you a word about 100 and SP at the end, ok...?
xxx
The standard 200/300s have 7 tanks - from left to right it goes like this -
#1 reserve - 3,400 lbs - gravity feeds into #1 main...
#1 main - 29,600 lbs - has 2 boost pumps...
#2 main - 82,000 lbs - has 2 boost pumps...
center wing - 112,000 lbs - has 2 boost pumps...
#3 main - 82,000 lbs - has 2 boost pumps...
#4 main - 29,600 lbs - has 2 boost pumps...
#4 reserve - 3,400 lbs - gravity feeds into #4 main...
xxx
For the above, full wing capacity is 230,000 lbs...
And total capacity, of all tanks is 342,000 lbs...
xxx
A few 200s and many 300s have 9 tanks, in addition:
#2 reserve - 5,400 lbs, gravity feeds into #2 main...
#3 reserve - 5,400 lbs, gravity feeds into #3 main...
Not many, have a 10 tank configuration - a fwd aux center wing tank...
(about 10,000 lbs, gravity feeds into the center wing tank)
9 tank total fuel capacity = 353,000 lbs... 10 tanks = 364,000 lbs...
xxx
Fuel use is as follows in 200/300s -
From takeoff, feed engines #2 #3 from their #2 #3 main tanks, and center wing tank to engines #1 #4...
If you have 9 tanks configuration, transfer reserve #2 #3 into main tanks #2 #3...
Get center wing tank empty...
Then feed all engines from #2 #3 mains - until the fuel remaining in these main tanks equal the amount of the #1 #4 and their reserve tanks...
Then go tank to engine...
At top of descent, start transfer fuel from #1 #4 reserve to their main #1 #4...
xxx
Difference with 100 and SP aircraft: center wing tank only 86,000 lbs...
Difference with SP (only) - has the 9 tanks configuration (#2 #4 reserves)...
xxx
If you work your fuel burn as recommended, you will stay in CG limits, and when you land, the amounts remaining in your main tanks will all be equal.
xxx
Fueling: fill the wings first, then center wing tank...
If you have 9 tanks, reserves #2 #3 are last tanks you fill...
Always check L3 and R3 cabin doors - and gear doors closed before fueling...
Some have a fueling station in cockpit (F/E panel) as option...
The 747 was the first Boeing which can transfer fuel from tank to tank...
xxx
That is the most important points about fuel tanks in the 747 Classics...
Do pilots get "free steaks" at your FBO if we ask for a fillup?
xxx
(s) Skipper  Smile

 
Guest

RE: B-747 Fuel Question

Mon Oct 21, 2002 4:58 pm

I am tired - excuses -
Full tank capacity in 100 is 316,000 lbs -
In SP it is 327,000 lbs -
xxx
After this posting, I call my union - and go on strike...  Wink/being sarcastic
(s) Skipper
 
Guest

RE: B-747 Fuel Question

Tue Oct 22, 2002 8:17 am

Forgot to say - bad teacher here -
The APU receives fuel from #2 main tank, so if a plane will be long using APU, suggest locating extra 500 to 1,000 lbs in that #2 main tank...
xxx
All fuel pumps are AC power... so if starting APU with battery (DC only, no AC) there is an additional DC fuel pump in #2 main tank to feed APU...
xxx
Undumpable fuel - 7,000 lbs each main tanks = total 28,000 lbs...
Fuel system course copyrighted A.net - completed... let's take a break...
(s) Skipper  Wink/being sarcastic
 
mikeclod
Posts: 270
Joined: Wed Dec 19, 2001 4:03 pm

RE: B-747 Fuel Question

Wed Oct 23, 2002 4:16 am

Thank you very much skipper, I don't know about steaks, but how about a soda? Mikeclod

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