Ariane 5 rocket returning to hangar for sensor swap

Arianespace is returning an Ariane 5 rocket — loaded with three U.S.-built satellites — back to its final assembly building in French Guiana to replace a suspect sensor on the vehicle that prompted officials to cancel a launch attempt Friday. Arianespace said Saturday the troubleshooting will take several days. The European-built launcher was set for takeoff Friday from the Guiana Space Center on the northeastern shore of South America. But the automated countdown stopped around two minutes prior to launch time after a problem with a sensor on the Ariane 5’s first stage liquid hydrogen tank. More

(Source: SpaceFlight Now - Aug 2)