STS-119 has launched after an issue-free tanking and countdown, following engineering work to troubleshoot a LH2 (GH2) leak from the Ground Umbilical Carrier Plate (GUCP) attached to the External Tank. Discovery launched at 19:43pm local time launch, with added focus on the T-0 umbilicals on the TSM (Tail Service Masts) – following an incident on STS-126.
