CAPE CANAVERAL, Fla. -- Technicians are inspecting the liners inside hydrogen fuel lines in shuttle Discovery after finding liner cracks in a pipe leading to one of Atlantis' engines. It's unclear whether the cracks would pose a danger to a shuttle during launch.

After finding a small crack in the main propulsion system flow liner, two more cracks were found in the same place. Inspections elsewhere on shuttle Atlantis turned up no more cracks, NASA spokesman James Hartsfield said.

The liners act as sleeves inside the hydrogen fuel line in the plumbing for the shuttle's engine. NASA is working to determine whether the problem is limited to that one liner, which was in a bellows, where the fuel line bends.

The fuel line wasn't in danger of leaking, Hartsfield said. Technicians need to determine whether pieces could have come off the cracked liner and contaminated the fuel line, and NASA will try to find out whether the flaw occurred during manufacturing on that piece or if it has the potential to be more widespread.

"Right now, how or if they're going to be repaired on Atlantis is being determined," Hartsfield said. Atlantis is scheduled to launch Aug. 22 on a space-station construction mission.