NASA engineers are reportedly working on fixing some technical issues at Atlantis and Endeavour’s external fuel tanks, with little time left before the first launch is scheduled to take place, the Aerospace Daily & Defence Report revealed.

Atlantis is the first to arrive at Kenney Space Center’s launch pad on September 2nd, in preparation for the October 8 launch, when it will begin its 11-day mission servicing the Hubble Telescope. The agency was forced to put the works on Atlantis on hold amid unfavorable weather conditions.

Last week, NASA was forced to close down its Kennedy Space Center launch complex as Tropical Storm Fay reached Central Florida. Atlantis was supposed to arrive at the launch pad on August 30.

According to NASA, Atlantis will be carried to Launch Pad 39A by one of NASA’s crawler transporters. The shuttle is currently in the Vehicle Assembly Building, where engineers continue to make the final connections between the shuttle and the external tank.

NASA’s second space shuttle, Endeavour, which is scheduled to launch on November 10 with the mission of delivering supplies to the International Space Station, is reportedly facing similar problems with the external fuel tank.

Endeavour will remain on stand by on Launch Pad 39B at the Kennedy Space Center. After Atlantis lifts off, Endeavour will be moved to Launch pad 39A for the start of STS-126, NASA said.

The sky is not clear yet for Atlantis however, as Tropical Storm Hanna could pay the Kennedy Space Center a visit next week, when it is expected to intensify and reach higher wind speeds.

In the meantime, as the works on Atlantis and Endeavour continue, the astronauts who will be working on upgrading the Hubble during STS-125 carry on with their training missions and practices at NASA’s Johnson Space Center in Houston.