Lunar ascent P12 not cutting off | Reentry - A Space Flight Simulator | Page 1

deft fox Nov 4, 2024, 5:04 PM

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I have a save state for just after I landed on the moon but when I load it in and use P12 the engine doesn't cutoff and I was put into a 5.2x700 orbit I tried this a couple times and regardless it always puts me in some wonky orbit. Unrelated but in the same save state I have a warning light in the CM for MN BUS A undervolt, is there a way to fix that or is it just a failure I have to live with?

visual hill Nov 4, 2024, 5:14 PM

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For the LM, did you turn off the ENG ARM switch before predicted APS cutoff?

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And for the CM you can reset the light, it will come back on if the condition still exists

deft fox Nov 4, 2024, 7:14 PM

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For the main bus, turning the fuel cells off and on again worked, for the ascent issue I tried what you suggested and it didn't work

visual hill Nov 4, 2024, 7:19 PM

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there is a reset switch for the main busses also. For the LM, do you have your engine start button presed by chance? Assuming things are wired correctly, that would be another source for the engine arm signal to stay on.

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but P12 should issue a cutoff command, ENG ARM has to be off and the ENG START pb has to not be pushed

deft fox Nov 4, 2024, 7:22 PM

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Yes so shortly after I typed that the alarm came back on so I tried the reset and that worked. I'll go ahead and try what you said for P12

deft fox Nov 4, 2024, 7:45 PM

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Turning engine arm off and not pressing start engine did not work

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Maybe it's a save state thing I'll try on the lunar stay scenario

visual hill Nov 4, 2024, 7:47 PM

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All I can speak of is how the actual LM worked here. So could be a reentry bug or glitch.

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Assuming in PGNS control, the computer will send the shutdown when your targeted dv is reached. What were your N76 values in P12 before liftoff?

deft fox Nov 4, 2024, 7:54 PM

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R1 is 55406

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R2 is 00320

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R3 is all 0

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Also I didn't notice any effect from this so I figured it was a bug but the NO ATT, ALT and VEL lights are on next to the dsky

visual hill Nov 4, 2024, 8:21 PM

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not good lol

deft fox Nov 4, 2024, 8:54 PM

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Which part?

visual hill Nov 4, 2024, 9:40 PM

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the lights

deft fox Nov 4, 2024, 9:53 PM

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Is there a fix for it?

visual hill Nov 4, 2024, 9:58 PM

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No idea those should not be on IRL for ascent

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ALT and VEL lights should be disabled and NO ATT means your IMU isn't up

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So that's a reentry problem

abstract mirage Nov 5, 2024, 4:56 PM

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Whenever you load a save the LM IMU goes through its spin up process for some reason

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So you have to give it 90 seconds to power on

untold siren Nov 7, 2024, 6:46 PM

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Explosion Device were activated?

visual hill Nov 7, 2024, 6:47 PM

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ED has nothing to to with APS cutoff signal

deft fox Nov 11, 2024, 10:03 PM

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I found the issue the imu wasn't activated right

visual hill Nov 12, 2024, 12:24 AM

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funny thing in the real LM you wouldnt even be able to go much into P12 without a warning if it wasnt

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would give you a program alarm

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deft fox Nov 12, 2024, 3:23 AM

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That's pretty cool actually

#Lunar ascent P12 not cutting off