Leak checks have been completed on space shuttle Endeavour’s external fuel tank’s ground umbilical carrier, or GUCP, plate at Launch Pad 39A.
Today technicians will focus on connecting the auxiliary power unit (APU) quick disconnects. The APU is a hydrazine-fueled, turbine-driven power unit that generates mechanical shaft power to drive a hydraulic pump that produces pressure for the orbiter’s hydraulic system.
Endeavour’s launch to the International Space Station is targeted for April 19.