#sts133 Final helium purge of 3 main engines underway, ready for main engine start. Flight control surface test underway
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
#sts133 Final helium purge of 3 main engines underway, ready for main engine start. Flight control surface test underway