STS-134 Endeavour shuttle launch Director Mike Leinbach announced that the launched will be delayed at least 72 hours. NASA Ames had planned to host a launch viewing party and had doors open at 10 a.m. The news about Endeavour's delay became official at 10:14 a.m. today.
Endeavour, scheduled to launch at 12:47 p.m., was postponed due to an issue that arose in today’s launch scrub. During countdown, "engineers detected a failure in one of two heater circuits associated with Auxiliary Power Unit (APU) 1."
Engineers were unable to activate the heater.
The launch team will meet today to refine their troubleshooting plan and NASA will host a news conference at 4 p.m. to discuss today’s scrub and the plan.