IUS Airborne Support Equipment

It's an Interstage for the Inertial Upper Stage.
It is activated by AG6 on duoquan's Space Shuttle so change AG6 on the Space Shuttle from duoquan to extend interstage. It rotates on 50° up from the cargo bay.
Input: Slider 1
Tips:
Remove the command chip and save the rest as a subassembly.
When it is attached to the Space Shuttle from duoquan on the cargo bay (inside), remove the connection on rotator 1 so nothing will happen weird to the interstage.
To attach the Inertial Upper Stage and your payload to this interstage, put the Inertial Upper Stage to where the fuel tank isn't covered but lines up with the inlet then go to the side interstage and add a part connection to its release connection point then choose nose cone then surface then press connect.
A fact:
It is a module for the Space Shuttle because it is only used for missions with the Inertial Upper Stage. You can resize this too.