CRJ200 WAS DISPATCHED WITH A MAIN GEAR DOOR REMOVED. GEAR WOULD NOT RETRACT AFTER TKOF; SO AN EMER WAS DECLARED AND THE FLT RETURNED.

Narrative

ACFT WAS DEFERRED UNDER CDL. MAIN GEAR DOOR REMOVED (PLT BELOW 250 KTS AND FL350). MAINT HAD DONE EXTENSIVE REPAIRS TO THE L MAIN AFTER A LNDG WITH PUNCTURES. ALL LOOKED OK DURING PREFLT (LESS MISSING L MAIN GEAR DOOR). CDL WAS BRIEFED. A NORMAL TKOF WAS PERFORMED. GEAR SELECTED UP AT ABOUT 800 FT AGL WE GOT A TRIPLE CHIME AND GEAR DISAGREE. RED; GREEN; GREEN. ATC WAS NOTIFIED. WE'D LIKE TO STAY AT 6000 FT 200 KTS AND NOT LEAVE THE AREA. WE GOT VECTORS. I WANTED TO TALK TO MAINT SO I XFERRED CTLS TO THE FO; READ THE QRH AND PERFORMED STEP #1: HYD 3B AND 2 ON. BRIEFED MAINT WHO TOLD ME TO COMPLETE THE QRH AND RETURN WITH DISPATCH OK. DISPATCH AGREED AND AN ACTUAL LNDG DISTANCE WAS RECEIVED. I BRIEFED THE FLT ATTENDANT/PA OF THE INDICATION (GEAR SEEMED TO BE UP) AND THE RETURN AND THAT THE GEAR WILL SOON DROP. AFTER THE GEAR DROPPED I MADE ANOTHER PA LETTING THE FLT ATTENDANT/PAX KNOW WE HAVE A GOOD INDICATION. AN EMER WAS DECLARED. UNEVENTFUL LNDG AND TAXI IN. NO REGS OR PROCS WERE BROKEN TO MY KNOWLEDGE!