What was found
GEAR DISAGREE WARNING MESSAGE AFTER TAKEOFF. SELECTING UP. APPROX 6 SECONDS AFTER GEAR HANDLE MOVEMENT ACCOMPANIED WITH STEERING INOP CAUTION. RAN QRH, USED MANUAL RELEASE. NOSE LANDING GEAR DID NOT MOVE. NO ICING, NO TURBULENCE, NO EXCESSIVE MOVEMENT. ALL HYDRAULIC INDICATIONS NORMAL. HYD 2B AND 3B WERE IN ON POSITION, HYD 1 AUTO. EMERGENCY DECLARED. AIRSPEED APPROXIMATELY 170 LANDING WEIGHT 46,600.