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FG Space Shuttle : Massive Hydraulic failure and AOA

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FG Space Shuttle : Massive Hydraulic failure and AOA

Postby GinGin » Fri Nov 23, 2018 10:27 pm

Heya.
Quick sum up of my last scenario where once again I will not stay too long in Orbit.


Another Morning with a stunning and severe Cavok over Florida.

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Shuttle ready on the pad, for a Launch at 29 ° of inclination

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Initial climb, everything looks good.
Very nice work Lego on the tiles, can't wait to see the rest :)

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Nice sky, no haze, pure azur

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Already far above the troposphere, Booster separation

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Very dirt Window and screens, nice effects :)

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Orbital insertion worked like a charm, ET sep and one of the worst case scenario will happen shortly ;)

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Master Caution 14 mn into the mission, APU Underspeed on two of our APU

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Let's go through some checklit for Underspeed and APU Shutdown in the Ascent Pocket Checklist

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Easy enough to deal with, we are going to secure APU 1 and 2

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Now what to do? Just one APU remaining, looks like an impending of Hydraulics.
Our best option is to come back as soon as possible on ground, so we will abort our orbit and perform an AOA

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First, some post MECO reconfiguration before diving through AOA Deorbit and entry procedures

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Weather on KSC is gonna degrade, let's take Edwards, Sum of Apogee and Perigee is between 274 and 144 Nm
AOA solution 10 seems perfect.
TIG at 42 mn, almost halfway from Edwards.

We have on the table below value to enter into Leo Tools to give us a nice PEG 4 solution.

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Very nice new Mission Control Center, I need another screen I think
Solution entered, Deorbit burn programmed with a Re entry Interface around 3000 Nm ( I expect it to be more around 3500 to 4000 Nm after burn)
Forecasting with High elliptical and low height orbit is always subject to many perturbations .

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Let's push

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Another problem then, the Center Of Gravity , still aft due to the remaining propellant in OMS tanks.
We will dump it through RCS jets to decrease it below 50 %

Also, we can deactivate the 2 rear RCS jets pushing through the X axis to avoid orbit perturbation (I thought to that too late, and Shuttle lost 20 Nm at Perigee, steeper entry and and longer REI)
Spec 23 is the page to do that

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Rest of the checks are similar than for a nominal entry , but condense in a very short timelapse

Ready for entry, just one APU and Hyd remaining
Should be ok, with a sluggisher elevon rate

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Overhead Edwards after 1 h20 mn into space, quite quick one

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Back to the ground

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Desertic, indeed :)

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Re: FG Space Shuttle : Massive Hydraulic failure and AOA

Postby legoboyvdlp » Fri Nov 23, 2018 10:41 pm

That would be a scary situation... Another system lost and it would not end well :(
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Re: FG Space Shuttle : Massive Hydraulic failure and AOA

Postby GinGin » Mon Nov 26, 2018 8:09 am

Ahah indeed :)
they thought to so many multiple failures
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