Systematic fuel warning after 10mn flight
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Also possible : you took only one drop tank, and your warning is TRP FUEL.
-> solution : take tanks in pair
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By the way I do not understand the bolded part below (isnât it the position by default):
Doesnt matter⌠Trust, but Verify (all switch positions prior to engine start).
Yeah, no time to check all that, starting on the runway and taking offâŚ
Well, if you have any problems that COULD be the result of switches not being set correctly, then your apparent first course of action is to first CHECK those switches - and then start looking for other possible causes.
Ive never seen trapped fuel in BMS due to using AB for too long. In fact, come to think of it, Ive just not seen trapped fuel.
Id start by checking the fuel qty sel knob, the fuel source knob, the DTC BINGO setting, and the loadout.
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Pretty sure that the fuel and bingo system works as per the dash with regards to the warnings displayed.
some of the CRUS HOM stuff is still not quite correct, but the bingo warnings should be the same as what the real manuals say, rather than say the original F4 manual.
Speaking of the real manuals, they do also predict possible fuel issues related to having the fuel qty sel switch out of norm, too.
The BINGO logic should trigger if for example:
Internal fuel 4000 lbs.
Total fuel 6000 lbs.
Bingo setting 5000 lbs.In BMS I canât get the bingo logic to trigger in the case where internal fuel is less than bingo but totalizer is more which is a feature of the real jet.
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The Bingo fuel warning is based either on fuselage fuel (ie. internal fuel only) with the FUEL QTY SEL knob in NORM, or on the total fuel (ie. including the fuel remaining in external tanks) with the FUEL QTY SEL knob out of NORM.
With the FUEL QTY SEL knob in NORM, the bingo computation is based on the lesser of fuselage fuel weight or total fuel weight. That is, with the FUEL QTY SEL knob in NORM, bingo fuel warning will be triggered when either fuselage fuel or total fuel decreases below the bingo fuel value.
With the FUEL QTY SEL knob out of NORM, the warning will only be triggered when total fuel decreases below the bingo value. The fuselage fuel is considered to be fixed at 6667lbs, and so a Bingo value set below this will never trigger a Bingo warning. With trapped external fuel, this could lead to fuel starvation before the bingo warning is triggered.
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The BINGO logic should trigger if for example:
Internal fuel 4000 lbs.
Total fuel 6000 lbs.
Bingo setting 5000 lbs.In BMS I canât get the bingo logic to trigger in the case where internal fuel is less than bingo but totalizer is more which is a feature of the real jet.
Out of interest, in BMS how did you get internal fuel less than full with tanks that still have fuel in them?
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Out of interest, in BMS how did you get internal fuel less than full with tanks that still have fuel in them?
Air Source out of position
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Air Source out of position
in what position does it stop pressurising the tanks but still allow FCR operation?
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in what position does it stop pressurising the tanks but still allow FCR operation?
None.
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Out of interest, in BMS how did you get internal fuel less than full with tanks that still have fuel in them?
Air Source out of position
yup
trapped fuel in wing tanksin what position does it stop pressurising the tanks but still allow FCR operation?
None.
So, to clarify - in BMS, there should never be a way to have less than full internal fuel AND still have fuel remaining in external tanks, while not being aware of some fault somewhere (as the FCR will be inop)?
Surely this is more of a problem IRL, then?
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Or the AAR door open. In BMS given condition X I wasnât getting behavior Y. I make no judgement about how common or likely condition X is, only that it is possible.
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So, to clarify - in BMS, there should never be a way to have less than full internal fuel AND still have fuel remaining in external tanks, while not being aware of some fault somewhere (as the FCR will be inop)?
Surely this is more of a problem IRL, then?
As Frederf stated the AAR door open will not allow the externals to feed as they depressurize those tanks in preparation for the AAR. If you forget to close the door the system will feed from internals until empty with a full set of tanks still. Have seen a guy do this where he forgot the switch and once past 7200 pounds he dropped the tanks thinking they were empty and he just got rid of over half of the gas he had left.
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Left console > fuel panel > ENG FEED knob, do you have this on the NORMal position? Error is a imbalanced / trapped fuel state, surly happening after AB takeoff, that explains your distance covered before the error appears. Are the rest fuel-related switchology positioned correctly?
Although it was on Normal position, I moved the knob left and right and that seems to have solved the issue, as Iâve been able to fly two missions without reappearance of the fuel warning 6 to 10 mn after takeoff. Thanks a lot for your help.
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As Frederf stated the AAR door open will not allow the externals to feed as they depressurize those tanks in preparation for the AAR. If you forget to close the door the system will feed from internals until empty with a full set of tanks still. Have seen a guy do this where he forgot the switch and once past 7200 pounds he dropped the tanks thinking they were empty and he just got rid of over half of the gas he had left.
And thatâs why they invented an ops check where you actually move the fuel qty sel knob out of norm to the other positions to systematically check if the tanks are still feeding.
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or by habits you donât move the switch and just declare them feeding or dry depending on your totalizer
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âŚafter 6 to 10 mn of flight, I heard a warning signal sound, then âFuelâ is displayed on the HUD and will stay blinking, then after a while, ⌠I will run out of fuel âŚ
How can I fix this problem ⌠? Any idea?
Thanks in advance.
Shut down afterburner after takeoff?
Couldnt resist on that one
Greets!