Meadville Space Center

Project Apollo - NASSP => Support & Bugs => Topic started by: Shadow Addict on May 09, 2009, 01:26:27 PM



Title: RCS problem right before reentry
Post by: Shadow Addict on May 09, 2009, 01:26:27 PM
I'm in the process of preparing for reentry, and I was at the step where the CSM has to be rotated 45 degrees. I started the rotation, but when I tried to stop it, nothing happened. I looked at the C/W panel and noticed that the SM RCS B and SM RCS D lights are lit. I checked out the RCS Indicators, and it turns out thrusters B and D have no pressure, while A and C do. This is a huge problem, as I am about a half hour from reentry. Any possible fixes for this?


Title: Re: RCS problem right before reentry
Post by: Tschachim on May 09, 2009, 05:40:21 PM
Probably this: Each SM RCS quad has 2 tanks, a primary and a secondary tank and the secondary tank isn't pressurized at launch. When about half of the propellant of a quad has been used, the primary tank is empty and you need to pressurize the secondary tank by switching the SM RCS SEC FUEL PRESS A/B/C/D switches to OPEN.

Cheers
Tschachim


Title: Re: RCS problem right before reentry
Post by: Shadow Addict on May 10, 2009, 11:04:08 AM
That doesn't appear to work. Are the SEC FUEL PRESS switches supposed to be grayed before I switch them to open?

EDIT: I tried it again and just skipped the yawing. I had a turbulent reentry which landed hundreds of miles off, and now according to PAMFD my crew status is critical, but at least they're alive! :DDD


Title: Re: RCS problem right before reentry
Post by: Tschachim on May 10, 2009, 02:51:31 PM
Are the SEC FUEL PRESS switches supposed to be grayed before I switch them to open?

The SM RCS SEC FUEL PRESS A/B/C/D switches aren't coupled with talk backs. Perhaps you just ran out of propellant? If you post/attach a scenario, I can take a look.

Cheers
Tschachim