A DO228 WAS BEING PREFLT CHKED. THE CAPT SELECTED FLAPS 1 DEG. IN DOING SO; RELEASED THE L AILERON GND LOCK THAT WAS INSTALLED WITH NO STREAMER.

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I WAS THE CAPT OF FLT. I SHOWED UP FOR WORK; MY FO HAD ALREADY COMPLETED PREFLT OF OUR AIRPLANE. I WENT OUT TO DO A WALKAROUND AND TO CHK FOR SUFFICIENT FUEL LOAD. WHILE IN THE COCKPIT; I PLACED THE FLAPS TO POS #1 FOR TKOF SETTING. THIS ACTION RENDERED THE L AILERON LOCK; WHICH BOTH PLTS MISSED ON THE PREFLT; INEFFECTIVE. THE FOWLER FLAP DESIGN ON THE DO-228 MOVES THE FLAPS FIRST OUTWARD THEN DOWNWARD MAKING IT POSSIBLE FOR THE FLT CTLS TO BE FREE AND CORRECT WITH THE CTL LOCK INSTALLED. AFTER STEPPING OUT OF THE COCKPIT; I VISUALLY CHKED TO SEE IF THE FLT CTLS WERE FREE BY MOVING THE YOKE. DUE TO THE FACT THAT THERE WAS NO 'REMOVE BEFORE FLT' TAG INSTALLED ON THE CTL LOCK; I STILL DID NOT NOTICE THE CTL LOCK. WE THEN LOADED PAX AND TAXIED OUT. WE ACCOMPLISHED THE BEFORE TKOF CHKS; TOOK OFF AND ON CLBOUT NOTICED THAT WE WERE DRAGGING THE L AILERON LOCK BY THE BUNGEE CORD THAT SECURES IT TO THE AIRPLANE. SINCE THE DEVICE HAD FALLEN OUT OF ITS POS ON THE WING; IT CAUSED NO PROBS TO THE FLT CHARACTERISTICS OF THE AIRPLANE. I CALLED THE TWR; WE RETURNED AND LANDED SAFELY WITHOUT INCIDENT. MAINT IMMEDIATELY CHKED ALL OF OUR COMPANY ACFT FOR 'REMOVE BEFORE FLT' TAGS ON ALL PITOT TUBES; STATIC PORTS; AND CTL LOCK DEVICES TO PREVENT SUCH AN INCIDENT FROM HAPPENING AGAIN.