EMB ERJ 145 ER/LR
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Returned To Departure Airport; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Landed in Emergency Condition
Aircraft
During takeoff upon rotation; LG AIR/GND FAIL" CAS message. We notified ATC and completed the applicable QRH procedure and all checklists. We also conducted an over weight landing in accordance with applicable QRH procedure. We landed at 4X;XXX lbs with 100 fpm rate of descent. After landing crash fire rescue inspected the aircraft. They found no damage. We continued to the gate and deplaned our passengers.Cause - "LG AIR/GND FAIL" CAS message and the inability to retract gear."
During takeoff upon rotation; LG AIR/GND FAIL" CAS message.  We notified ATC and completed the applicable QRH procedure and all checklists.  We also conducted an over weight landing in accordance with applicable QRH procedure.  We landed at 4X;XXX lbs with 100 FPM rate of decent.  After landing crash fire rescue inspected the aircraft.  They found no damage.  We continued to the gate and deplaned our passengers.  All in all; [everything] went well.  Could improve my briefing to the flight attendant.  First Officer and I worked well together.  ATC support was excellent."
EMB-145 flight crew reported a landing gear problem requiring a return to the departure airport.