Live from launch pad 39A (members only)

NASA and U.S. military officials are reviewing a malfunction that triggered a premature engine shutdown during a flight of a SpaceX Falcon 9 rocket earlier this month, a cautionary step before upcoming launches with a GPS navigation satellite and astronauts on SpaceX’s Crew Dragon spacecraft.

SpaceX’s launch director halted a countdown Tuesday to replace a sensor on the upper stage of a Falcon 9 rocket set to blast off with the GovSat 1 communications craft, the product of a joint venture between the commercial satellite operator SES and the government of Luxembourg.

SpaceX’s next launch with a European-built communications satellite has been delayed to no earlier than March 28 to study a problem with a helium pressurization system on the Falcon 9 rocket, officials said Tuesday.