A CE560XL Captain reported the landing gear would not retract after takeoff. The flight returned to departure airport where equipment was standing by. Maintenance had worked on the aircraft the previous evening for the same problem.

Narrative

Prior to departure; a review of the aircraft logbook revealed Maintenance had been performed on the aircraft the night before. Specifically; a maintenance write-up concerning the landing gear being unable to retract had been signed off with the corrective action being the replacement of the left squat switch. We discussed the possibility of the landing gear not retracting prior to our flight and what our course of action would be. We departed as scheduled. When the pilot flying called for 'gear up' the pilot not flying attempted to retract the gear. The gear handle could not be moved out of the 'down' position. We reported the problem to Tower and; per our earlier discussion; returned for an uneventful landing. No emergency was declared but the airport dispatched a fire truck anyway per their policy. On post flight inspection we noticed that the squat disagree indicator in the nose compartment was indicating a white flag. Apparently replacing the left squat switch did not correct whatever problem is causing the gear not to retract. I feel the system should be given a more thorough inspection to include why the squat disagree indicator in the nose compartment was illuminated.