
A launch on Friday results in a rendezvous with the space station on Sunday, April 20 and a grapple at 7:14 a.m. NASA TV coverage will begin at 5:45 a.m. with berthing coverage beginning at 9:30 a.m.
The U.S. Air Force 45th Weather Squadron forecast predicts a 40 percent chance of favorable weather, with a chance of showers and thunderstorms that could result in violating the Thick Cloud, Lightning and Flight Through Precipitation rules.
SpaceX has settled on a backup launch date of Saturday, April 19 for the best pair of launch dates for the science payloads being delivered to the station. If needed, a Saturday launch would occur at 3:02 p.m.
NASA TV coverage would begin at 2 p.m. This would be a three-day transit to the station instead of two days with grapple on Tuesday, April 22.
If SpaceX launches Friday, a contingency spacewalk to replace a failed multiplexer-demultiplexer will be conducted on Wednesday, April 23. If SpaceX scrubs Friday and attempts to launch Saturday, the contingency spacewalk moves earlier to Sunday, April 20.
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