Hi. This is a UMMU compatible Shuttle-A. UMMU is a crew management system, created by Dan Steph.
You can get it here: http://orbiter.dansteph.com/index.php?disp=d
You MUST have UMMU installed prior to installing this addon. To install this addon, simply put ShuttleA.dll into Orbiter\Modules folder, overwriting the existing ShuttleA.dll. Make sure to backup the orignal in case you don't like this one!!!
This Shuttle-A also comes with:
Attitude hold autopilot (holds pitch/bank)
velocity hold
vertical velocity hold