A question for all of you,

Every flight i make i try to figure out how the fuel system works. I have tried the official operating manual and the sheet Lou has gives us like shown below.



Now my problem is that everytime i'm folowing the sheet my engines stops.

Like in the first example:

I have more than  9000KG of fuel in my center tank, so here are the things i do:

• All boost pumps are on
• Crossfeed selectors for engine 1 and 4 open
• Crossfeed selectors for engine 2 and 3 closed.

Now if I do this, engine 2 and 3 are shutting down, the same situation only than for engine 1 and 4 if i leave 2 and 3 on and I close 1 and 4.

What am i doing wrong here?

Also if I give the aircraft her fuel and only filling the main tanks and center tanks, the other tanks gives me the warning lights for the low pressure, I understand this because there is no fuel in it. but can I turn those warning lights off or do I need to fill all the tanks for a good flight.

This information is needed because:

[1] I want to make my flight as realistic as possible
[2] In the fuel planner that I am making there is a special sheet for the fuel distribution.

Now more information about the fuel planner.

Here i a list with the thing i have added.

• Performance sheets in LBS and KG
• Fuel sheets in LBS and KG
• Flight planning forms for LBS and KG
• Fuel Distribution on the Fuel sheet
• Takeoff speeds
• based on VBA logic
• Option to print the fuel sheet with one press on the button
• Automatic calculation of the flight time and fuel that is left in the tanks at arrival

At this moment it still needs some fine tuning but for 95% of my flights it is calculating my fuel with still 45 minuts of reserve at destination.

Kindly regards,

Rick Winkelman

CoolP,

The planner has been changed a lot since your last look.
Way better than first.

But maybe this is something lou can answer, (no offense ) but i seems to me that if you load the plane from the center tank first the aircraft is way better steerable and you have less weight in the wings?

I could be wrong offcourse.

I hope it is good because my fuel planner is loading the fuel from the center tank first

Kindly regards,

Rick Winkelman

Two example planes at 90t GW.

wing  fuselage  wing
  25t     40t    25t   (weight acting downwards)
    v       v       v

---o---+++---o---

  45t      0t       45t  (lift acting upwards)
    ^                ^

When you alter the fuel distribution while keeping the same GW, it may look like this.

wing  fuselage  wing
  10t     70t    10t   (weight acting downwards)
    v       v       v

---o---+++---o---

  45t      0t       45t  (lift acting upwards)
    ^                ^

Both planes are coming in at 90t but their structural loads differ a lot when it comes to the wing bending moment and the shear being caused.

I use the following procedures and settings with regard to fuel management:

Refueling:

1. Load all 4 main tanks equally.
2. After 1 and 4 main tanks are full, continue to load 2 and 3 main tanks.
3. After all main tanks are full, load reserve tanks.
4. After all wing tanks are full, load the center tank.

Preflight Preparation:

Fuel System                                                TEST & SET
- Fuel Quantity Gauges                      TEST
- Boost Pumps                                       TEST
- Tank No. 2 Aft Boost Pump Switch      ON
- All Crossfeed Selectors                       OPEN
- Reserve Tank Fuel Transfer Selectors      CLOSE
- Fuel Temperature Selector                       CHECK & NO. 1 TANK
- Fuel Heat Switches                                        OFF


Before Engine Start:

Fuel System                                        SET FOR START
* “Tank to Engine” Configuration:
- One Boost Pump Switch in tanks No. 1, 2, 3  & 4      ON
- Center Tank Boost Pumps                                       OFF
- Crossfeed Selector No. 1                                       OPEN
- Crossfeed Selectors No. 2, 3 & 4                       CLOSE

Taxi-out:

Fuel System                                                            SET FOR TAKEOFF
* If Center Tank empty or less than 20,000 lbs :
->(“Tank to Engine” Configuration):
- One Boost Pump Switch in tanks No. 1, 2, 3  & 4      ON
- Center Tank Boost Pumps                                       OFF
- Crossfeed Selectors No. 1                                       OPEN
- Crossfeed Selectors No. 2, 3 & 4                       CLOSE
* If Center Tank exceeds 20,000 lbs
-> “Center Tank to Outboard, Main Tanks to Inboard Engines” Configuration:
- One Boost Pump Switch in tanks 1, 2, 3, 4 & Center      ON
- Crossfeed Selectors No. 2 & 3                                       CLOSE
- Crossfeed Selectors No. 1 & 4                                       OPEN

Cruise:
Check every 20 minutes the following set of conditions and act appropriately:

* If Center Tank exceeds 20,000 lbs and less than 12,000 lbs of total fuel consumed
->”Ctr Tank to Outbd. Eng., Main Tanks to Inbd. Eng.” Configuration:
     - Boost Pump Switches for tanks 1, 2, 3, 4 & Center    ON
     - Crossfeed Selectors No. 2 & 3                                   CLOSE
     - Crossfeed Selectors No. 1 & 4                                   OPEN
* If Center Tank less than 20,000 lbs Or 12,000 lbs of fuel consumed
-> “Ctr. Tank to All Engines” Configuration:
     - Crossfeed Selectors No. 1, 2, 3 & 4                    OPEN
     - Boost Pump Switches for tanks No. 1, 2, 3, 4 & Center      ON
* If Center Tank empty
->(1) ”Balance Main Tanks” Configuration (Inboard Tanks to all Engines)
     - Crossfeed Selectors No. 1, 2, 3 & 4                    OPEN
     - Reserve Tank Transfer Valves No. 1 & 2       AS REQUIRED
     - Boost Pump Switches for tanks No. 1, 4 and Center    OFF
     - Boost Pump Switches for tanks No. 2 & 3                    ON
     - 2nd Boost Pump Switch for Tank No. 2 or 3, whichever has less fuel      OFF for balancing
->(2) When Inboard Tanks Fuel = Outboard Tanks Fuel + Reserve Fuel: “Tank to Engine” Configuration:
     - Boost Pump Switches for tanks No. 1, 2, 3 & 4           ON
     - Center Tank Boost Pumps                                    OFF
     - Crossfeed Selectors No. 1                                    OPEN
     - Crossfeed Selectors No. 2, 3 & 4                   CLOSE


Cruise Descent:

All Main Tank Fuel Boost Pump Switches                                    ON


May you never suffer from fuel starvation.

Best regards

AlOl