EMB ERJ 145 ER/LR
Flight Crew Air Transport Pilot (ATP)
Human-Machine Interface
Aircraft Equipment Problem Critical
Flight Crew Returned To Departure Airport; Flight Crew Returned To Gate; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft
Immediately after takeoff an EICAS message appeared: 'LG AIR/GND FAIL' and we were unable to move the landing gear [lever] to the up/retract position. We completed several checklists and returned for an uneventful--below max structural landing weight--landing at our departure airport. We taxied back to the gate; notified Maintenance and Operations and entered appropriate AML write ups.
An EMB-145 flight crew; unable to raise their landing gear following receipt of an air/ground switch failure warning; returned uneventfully to their departure airport for maintenance attention.