Visit Captain Sim web site  
  Welcome, Guest. Please Login or Register

 

Page Index Toggle Pages: [1] 2  Send TopicPrint
 10 727 fuel management: empty central tank (Read 24851 times)
Rosario Manzo
Full Member
*
Offline



Posts: 53
Location: Naples, IT
Joined: Apr 16th, 2008
Gender: Male
727 fuel management: empty central tank
Dec 29th, 2010 at 7:54am
Print Post  
Hello friends.

Could anybody explain how to set the fuel panel (boost pumps, crossfeed valves) when my central tank is empty?

Thanks in advance and happy new year everybody.
  

Regards
Rosario Manzo, IT
Back to top
 
IP Logged
 
Markoz
CS Team
*
Offline



Posts: 12349
Location: Victoria, Australia
Joined: Apr 24th, 2009
Gender: Male
Re: 727 fuel management: empty central tank
Reply #1 - Dec 29th, 2010 at 11:01am
Print Post  
The idea is to use the Center Tank until it is equal to the Left and Right fuel tanks, and then to use all the tanks from that point on.

On the fuel panel are three Fuel Crossfeed Manifold Valve Switches, turn the Left and Right ones ON (in the horizontal). Turn OFF the FWD and AFT Fuel Boost Pumps for the Left and Right fuel tanks. See upper part of the image.

Once the Center Tank is about the same amount of fuel as the Left and Right Tanks, turn ON the FWD and AFT Fuel Boost Pumps for the Left and Right fuel tanks and then turn of the Left and Right Fuel Crossfeed Manifold Valve Switches. See the lower part of image.

Hope this helps.

Mark
  

727fuelsettings.jpg (Attachment deleted)

Mark Fletcher



PC: i7 10700K @3.8/5.1GHz | 64GB DDR4 3200 | 8GB RTX 2070 | 32" LCD Monitor | 1TB SSD & 2x2TB SSD | Win 11 Pro - FSX/FSX-SE/P3D3/P3D4/P3D5/P3D6/MSFS2020
15.6" Gaming Laptop: i7 7700HQ | 32GB DDR4 | 6GB GTX 1060 | 256GB SSD & 1TB HDD | Win 10 Pro 64bit - FSX-SE/P3D4
Back to top
 
IP Logged
 
Rosario Manzo
Full Member
*
Offline



Posts: 53
Location: Naples, IT
Joined: Apr 16th, 2008
Gender: Male
Re: 727 fuel management: empty central tank
Reply #2 - Dec 29th, 2010 at 11:24am
Print Post  
Mark,
thanks for your reply.

Maybe I'm missing something, but I generally load the center tank only if the wing tanks are full. So I will never have the situation stated above.

My question is now: must ALL the three tanks always have some fuel in? Or may I plan a flight with only wing tanks partially loaded? And, in such case, what configuration should I adopt in my fuel panel?

Thanks again mate!
  

Regards
Rosario Manzo, IT
Back to top
 
IP Logged
 
Markoz
CS Team
*
Offline



Posts: 12349
Location: Victoria, Australia
Joined: Apr 24th, 2009
Gender: Male
Re: 727 fuel management: empty central tank
Reply #3 - Dec 29th, 2010 at 12:28pm
Print Post  
Going by the information provided by some former 727 pilots, all three tanks must have fuel in them. So if you need to 21000 lbs of fuel for a flight, you put 7000 lbs in all three fuel tanks. If you are going to need more than ~36000 lbs of fuel, the extra has to go into the center tank and the above rule applies.

Mark
  

Mark Fletcher



PC: i7 10700K @3.8/5.1GHz | 64GB DDR4 3200 | 8GB RTX 2070 | 32" LCD Monitor | 1TB SSD & 2x2TB SSD | Win 11 Pro - FSX/FSX-SE/P3D3/P3D4/P3D5/P3D6/MSFS2020
15.6" Gaming Laptop: i7 7700HQ | 32GB DDR4 | 6GB GTX 1060 | 256GB SSD & 1TB HDD | Win 10 Pro 64bit - FSX-SE/P3D4
Back to top
 
IP Logged
 
Matt2218
Full Member
*
Offline



Posts: 134
Joined: Oct 4th, 2009
Re: 727 fuel management: empty central tank
Reply #4 - Dec 29th, 2010 at 12:36pm
Print Post  
Rosario -

As I understand it from guys who have actually flown the 727, you fill the tanks evenly until the wings are full, then keep filling the center tank as needed. Filling only the center tank would put undue stress on the wings...big heavy fuselage and light wings is not good.

For takeoff and landing you're supposed to feed "tank to engine" for safety (so that failure of one fuel system doesn't rob all of your power).

So, as Mark indicated you should set the fuel panel as follows:

1) Feed "tank to engine" (crossfeeds closed and all boost pumps on) for takeoff,

2) After takeoff, shift to burning center tank (crossfeeds open and wing tank boost pumps off) until tanks are all equal.

3) Then go back to feeding "tank to engine" by closing the crossfeeds and turning the wing tank boost pumps back on until you land.

Of course, it's just a simulator, so if you want to run center tank only you can set it up as discribed in #2 above from the beginning. You could also just fill the wing tanks and run the center off of them by opening the crossfeeds and turning off the center boost pumps. Just not how it's done in the real world.
  
Back to top
 
IP Logged
 
Rosario Manzo
Full Member
*
Offline



Posts: 53
Location: Naples, IT
Joined: Apr 16th, 2008
Gender: Male
Re: 727 fuel management: empty central tank
Reply #5 - Dec 29th, 2010 at 12:52pm
Print Post  
Matt, i was supposing to fill only the wing tanks leaving the central empty, as in modern airliners, not to fill central tank only.

Anyway, you guys gave me the info I was looking for.
Thanks Mark and Matt for your kind explaination.

Have a nice day.  Smiley
  

Regards
Rosario Manzo, IT
Back to top
 
IP Logged
 
CoolP
Senior Member
*
Offline



Posts: 2568
Joined: Jan 17th, 2010
Gender: Male
Re: 727 fuel management: empty central tank
Reply #6 - Dec 29th, 2010 at 2:30pm
Print Post  
There is some extra cooling done with the center tank fuel (the fuel cools other liquids) so don't let that one run dry.
Mark pointed that out here http://www.captainsim.org/yabb2/YaBB.pl?num=1280221924.

  
Back to top
 
IP Logged
 
LOU
Beta Team
*
Offline


727,707,747,757,767=
40years of Boeings

Posts: 1593
Location: Central PA, USA
Joined: Mar 3rd, 2010
Gender: Male
Re: 727 fuel management: empty central tank
Reply #7 - Dec 29th, 2010 at 5:13pm
Print Post  
Fuel management in the 727




FUELING
1. Fill ALL tanks equally until wings are full (automatic shutoff.)
2. Remaining fuel goes in center tank.

FUEL USAGE
- Fuel in center tank more than wings:
1. Start engines, Taxi & Takeoff - ALL boost pumps ON, all X-FEEDS open.
(The center fuel boost pumps create a higher pressure than the wing boost pumps (4 vs 2 + slightly larger) so fuel will burn from center tank)
2. Before 3,000 pounds are burned, start a cross feed from center tank to ALL engines. This is for CG & structural reasons.
       Ignition ON
       All boost pumps ON
       All X-FEEDS open
       Turn off boost pumps in tank #1 while watching engine instruments
       When engine stabilized, Turn off boost pumps in tank #3.
       When engine stabilized - ignition OFF
       Monitor fuel burn
When fuel in center tank equals wing tanks:
       ALL boost pumps on
       Close #1 & #3 X-FEED valves




Note: Boeing planes ONLY cross feed fuel to engines, you cannot transfer fuel from tank to tank. So if you have an engine failure of engine 1 or 3 you will have to cross feed fuel from the wing tank of the dead engine every once in a while to keep the wings within balance. Same if engine 2 were to fail, you would have to cross feed out of the center tank periodically to keep the tanks even.

During fuel dump the same is true. You must dump just like the normal fuel use procedure. If the fuel in center tank is greater than the wings you must dump from the center tank first, until equal, then you can dump from all three tanks. You will still have to monitor fuel balance as fuel will dump faster from the center tank than the wing tanks.


  

Processor: Intel Core i7-4770k @3.5Ghz Memory: 6Gb DDR3 1600mhz Video: NVIDIA GeForce GTX 680 Storage: 256Gb Samsung 840 Pro | 120Gb OCZ Agility 3 | WD Black 640Gb 7200rpm 55" Samsung LED - HDTV for monitor
Back to top
 
IP Logged
 
Rosario Manzo
Full Member
*
Offline



Posts: 53
Location: Naples, IT
Joined: Apr 16th, 2008
Gender: Male
Re: 727 fuel management: empty central tank
Reply #8 - Dec 29th, 2010 at 6:34pm
Print Post  
Thank you all for the kind feedback, a lot of precious infos here.

Happy new year all!
  

Regards
Rosario Manzo, IT
Back to top
 
IP Logged
 
Matt2218
Full Member
*
Offline



Posts: 134
Joined: Oct 4th, 2009
Re: 727 fuel management: empty central tank
Reply #9 - Dec 29th, 2010 at 7:44pm
Print Post  
Great stuff Lou, thanks!
  
Back to top
 
IP Logged
 
David Paul
Senior Member
*
Offline



Posts: 270
Joined: Dec 25th, 2010
Gender: Male
Re: 727 fuel management: empty central tank
Reply #10 - Dec 29th, 2010 at 8:05pm
Print Post  
This thread should be made into a sticky if this forum software has that feature.

Great info.
  


I5-6600K @4.2 GHZ | GTX-1070 | 32GB RAM | Windows 7/10 Dual Boot on SSD and M.2
FSX-Acceleration | P3D 4.5 | MSFS 2020
Back to top
 
IP Logged
 
Markoz
CS Team
*
Offline



Posts: 12349
Location: Victoria, Australia
Joined: Apr 24th, 2009
Gender: Male
Re: 727 fuel management: empty central tank
Reply #11 - Dec 30th, 2010 at 8:26am
Print Post  
Sadly, the CS 727 doesn't quite act like it should. If I leave ALL Fuel Pumps ON and ALL Fuel Crossflow Valves OPEN, then the 727 will alternate from tank to tank with the fuel supply. It will start of with a couple of thousand pounds feeding from the Left Wing Tank, followed by a couple of thousand pounds feeding from the Center Tank, followed by a couple of thousand pounds feeding from the Right Tank (or something like that). Then the cycle starts again. Sad

Mark
  

Mark Fletcher



PC: i7 10700K @3.8/5.1GHz | 64GB DDR4 3200 | 8GB RTX 2070 | 32" LCD Monitor | 1TB SSD & 2x2TB SSD | Win 11 Pro - FSX/FSX-SE/P3D3/P3D4/P3D5/P3D6/MSFS2020
15.6" Gaming Laptop: i7 7700HQ | 32GB DDR4 | 6GB GTX 1060 | 256GB SSD & 1TB HDD | Win 10 Pro 64bit - FSX-SE/P3D4
Back to top
 
IP Logged
 
Rhinozherous
Full Member
*
Offline



Posts: 11
Joined: Nov 19th, 2015
Re: 727 fuel management: empty central tank
Reply #12 - Nov 20th, 2015 at 8:24pm
Print Post  
Hey Pilots!

I write here because I cant open a new thread and I read this thread because I am new to the CS727 and I wanted to know how the fuel distribution is working...
but now I have the problem that my engines run out of fuel on every flight (all three at the same time).

My fuel load:
8000lbs in LEFT - CENTER - RIGHT

After startup I had all booster pumps ON and all the Crossfeeds OPEN (Selector is Vertical).
The Engines take the fuel just out of the center tank, and when the center tank is empty, all engines die.

Any suggestions for propper management?
FSX Gold Edition and the newest version of the 727 - SP 2.7

Thank you very much
  
Back to top
 
IP Logged
 
Mustang1977
Full Member
*
Offline



Posts: 150
Location: Austria
Joined: May 27th, 2014
Gender: Male
Re: 727 fuel management: empty central tank
Reply #13 - Nov 20th, 2015 at 10:21pm
Print Post  
Good Evening,

When you start with balanced fuel in all tanks (all have the same amount) you have to close the Crossfeed Valve No. 1 and 3 to burn the fuel uniformly.

I hope this helps  Smiley
  

 
Back to top
IP Logged
 
Sirxamoc
Full Member
*
Offline



Posts: 42
Joined: Jun 8th, 2012
Re: 727 fuel management: empty central tank
Reply #14 - Jan 4th, 2016 at 9:59pm
Print Post  
After installing the last update I found that I could not shut down my central feed and allow the engines to feed off the L & R tanks until I was balanced.

Reloaded the program 3x, tried different scenarios, and still had same results - no control.

Another thing I noted was the tank switches were in the wrong position from the initial start.  They starting in the closed position when they should be in the open position.

I even loaded a HJG 727 fuel panel and could gain control of the fuel switches but not with the CS727 panel.
  
Back to top
 
IP Logged
 
Page Index Toggle Pages: [1] 2 
Send TopicPrint
 
  « Board Index ‹ Board  ^Top