What was found
NOSE GEAR DID NOT RETRACT AND CREW RECEIVED A GEAR INDICATION WARNING. THEY RAN THE QRH, DECLARED AN EMERGENCY, AND RETURNED TO CVG. THEY LANDED SAFELY WITH NO ADDITIONAL INCIDENT. GEAR DISAGREE WARNING MESSAGE. NOSE GEAR DID NOT RETRACT. / INTERROGATED MDC FOUND CODE B1-007437 FOR PROX SENSOR PX22 OUT-OF-RIG/UNREASON-FAR. FOUND CLEARANCE ON PROX SENSOR PX22 TO BE 0.188", WITH CORRECT SPEC BEING 0.040"-0.050". PERFORMED ADJUSTMENT OF PROX SENSOR PX22 IAW CRJ900 AMM 32-61-05-820-804-A01-PSA. GEAR DISAGREE WARNING MESSAGE DID NOT RETURN. PROX SENSOR HEALTH RANGE CHECK THROUGH MDC GOOD WITH GEAR IN UP AND DOWN POSITIONS.