Updated March 30, 2018
NASA’s Stratospheric Observatory for Infrared Astronomy, SOFIA, remains in Hamburg, Germany, to address a repair that was discovered during a routine inspection and repair cycle, known as a C-Check.
The observatory was slated to return on Jan. 8, 2018, however, after completion of the inspection and maintenance by technicians at Lufthansa Tecknik AG, a fuel leak was discovered where the outer engine on the left side attaches to the wing. To return to flight operations, the wing fuel-tank leak must be addressed in accordance with safety requirements.