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G – UMmu turbopack and Cargo bay
This controls turbopack and cargo doors and release/grapple of payload or turbopack. If you want to grapple a turbopack or a cargo simply place it near the door and click on « grapple » button. On the ground the DGIV's cargo bay must be over a payload and turbopack and must be just below the corresponding door for grapple to work.
TIPS: you can load a cargo using the Orbiter scenario editor.