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OVRD/JETT Main 2&3 Pump indication

Started by ASCTU744, Sat, 10 Feb 2024 15:30

John H Watson

Quote from: ASCTU744 on Wed, 14 Feb 2024 06:43The 0/1 logic is explained in a scavenge pump schematic:


Note that that is the old logic (with out the post-TWA modifications to prevent tank explosion)

John H Watson

Quote from: Hardy Heinlin on Wed, 14 Feb 2024 11:58The transition to "0" after 5 minutes is also modelled in PSX. I think PSX agrees with all these descriptions and diagrams. You need to wait 5 minutes for the change from green to cyan.

So what is your explanation for the photo? I can assure you, I didn't have the pumps running for 5 minutes, especially with an empty tank.

Hardy Heinlin

I can reproduce the photo situation in PSX instantly without a 5 minute delay when I cycle the APU or EXT power off and on.

However, it's strange that main tanks 2 and 3 aren't amber on the photo although there's a fuel imbalance.

John H Watson

Quote from: Hardy Heinlin on Thu, 15 Feb 2024 06:46However, it's strange that main tanks 2 and 3 aren't amber on the photo although there's a fuel imbalance.

Isn't the imbalance trigger point 2722kg for the inboard tanks? There is only 1300kg difference in the photo.

  https://aerowinx.com/board/index.php/topic,4733.msg50416.html#msg50416

Hardy Heinlin

OK, when I reproduced your photo in PSX, I had a 1000 lbs hysteresis remainder within the allowed tolerance :-) I can clear that by reentering the tank quantity on the Instructor. So, it's all normal.