ggalfi
Well-known member
Hi all,
I'm flying the nominal Apollo 13 mission, and now I'm at GET135 hours where - to prepare the LM for ascent - the AGS should be updated from the LGC. The problem is that when I do first V47 then set up the new time bias to 130:00:00, call 414+10000 on AGS, and press PRO, then nothing happens in AGS. I mean 414 never changes to 0, and also reading out 440 (Rdot) is inconsistent with what I see on V83. I tried to turn on and off AGS, cycle telemetry HI/LO switch, etc. but nothing helped. I've printed the LGC telemetry downlink, and during V47 it provides the AGS update list (ID:77776) as it supposed to, so something on AGS's side causes the problem. The only solution I could come up with was to copy the AGS state (section between AEA_START and AEA_END) from an earlier phase of the same mission. It made V47 working, but certainly it is just a nasty hacking. I'm rather looking for a within-simulation solution - however there isn't any hint within the checklists how the AGS could be "reseted" or "restarted". Also I have no clue how I've messed up the AGS state. I tried to do every steps according to the LM Lunar Surface Checklist to power down and later power up AGS. If anyone who knows the guts of AGS has any advice on this topic, I'd greatly appreciate it.
I've attached a scenario right before pressing PRO in V47 to begin the update.
I'm flying the nominal Apollo 13 mission, and now I'm at GET135 hours where - to prepare the LM for ascent - the AGS should be updated from the LGC. The problem is that when I do first V47 then set up the new time bias to 130:00:00, call 414+10000 on AGS, and press PRO, then nothing happens in AGS. I mean 414 never changes to 0, and also reading out 440 (Rdot) is inconsistent with what I see on V83. I tried to turn on and off AGS, cycle telemetry HI/LO switch, etc. but nothing helped. I've printed the LGC telemetry downlink, and during V47 it provides the AGS update list (ID:77776) as it supposed to, so something on AGS's side causes the problem. The only solution I could come up with was to copy the AGS state (section between AEA_START and AEA_END) from an earlier phase of the same mission. It made V47 working, but certainly it is just a nasty hacking. I'm rather looking for a within-simulation solution - however there isn't any hint within the checklists how the AGS could be "reseted" or "restarted". Also I have no clue how I've messed up the AGS state. I tried to do every steps according to the LM Lunar Surface Checklist to power down and later power up AGS. If anyone who knows the guts of AGS has any advice on this topic, I'd greatly appreciate it.
I've attached a scenario right before pressing PRO in V47 to begin the update.