Narrative:

After liftoff the gear would not retract. Lnd air/grnd fail message on EICAS. Ran appropriate checklist; declared an emergency and returned to the departure airport for a routine overweight landing.

Google
 

Original NASA ASRS Text

Title: The E-140's landing gear failed to retract after takeoff.

Narrative: After liftoff the gear would not retract. LND AIR/GRND FAIL message on EICAS. Ran appropriate checklist; declared an emergency and returned to the departure airport for a routine overweight landing.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.