Connect Panels Fixed connections after engine is installed Ground support panels must disconnect at t - 4 Panels: 1. T - 4 Panel - disconnected 4 sec before liftoff. This panel has a line with cold He to circulate thru fuel pump - cools pump. (This is the He line in top left of engine diagram.) 2. Propellant loading - has a separate connection. This line is pulled as the vehicle rises. The vehicle is held down while thrust builds. When thrust comes up, it is released and off it goes. Lines are pulled. Enables abort if engines malfunction. Ground Support Configuration Changes: If you change height of line attachments (bad). Keep heights constant for ground support (good) The vehicle has 2 or 3 payload configurations - attach at bottom of faring to keep constant height.