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Working-Title-MSFS-Mods / fspackages

Working Title FS Packages
MIT License
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CJ4 flips inverted due to massive fuel inbalance. often on final #1456

Open tigert opened 2 years ago

tigert commented 2 years ago

So I have had these a few times now. Approaching on final on an approach, ILS or RNAV, not sure if that is related - in any case about to turn final, I suddenly usually notice one engine flaming out, and that tank being empty. Could be my throttles are not 100% equal, fair enough, but still the consumption seems to differ quite a bit at times.

Anyway, many times after the flameout the plane flips inverted and goes to an unrecoverable spin... which is understandable when one tank has 4800 metric tons of fuel, and the other is negative 557 tons...

image

So something is definitely fishy - I suspect the flameout happens because this imbalance happens - it is not always this drastic, but when it is, naturally it is game over for the flight model.

marbleflower commented 2 years ago

I can report the same issue happening for me as well, it's actually happened once earlier during the flight but not quite on an extreme level. During the descent one tank filled up to 50% and I got a Fuel Imbalance caution warning and I just changed the fuel levels in the in game menu and continued until eventually I encountered the same problem described above. I reloaded the flight on the same approach and I also got a master caution and spun out, this time I haven't captured the ILS yet. It took me a while to find the problem but I found a screenshot confirming it. I loaded my flight plan from Simbrief, however I'm not sure if that affects the fuel and weights in game. I then edited the fuel, weights, and CG manually in the in game menu to match the values in the OFP. I use the Modern flight model and I have my assistance settings mostly set to True to Life with only the panels turned off. I have CJ4 version 0.12.11 and MSFS 2020 version 1.21.13.0.

EDIT: Units were set to Metric and simulator units were Hybrid

Approach is LGAV ILS-Y 03R

Inked1250410_20211224094613_1_LI

Sotiris1955 commented 2 years ago

I tried the workingtitle-cj4-v0.12.9 and I am very satisfied. So let's be patient up to the final solve of the issue.

tigert commented 2 years ago

Metric and hybrid here too, whether it matters.

ldrr commented 2 years ago

Same issue right now, 2 times, first after lining up, EHRD24. Empty fuel in left tank. Then a second time at ~FL180, massive fuel imbalance with stall and spinning and no chance to recover the aircraft. And yes, units were set to metric.