AN SF340 WAS RPTED TO HAVE L WING OUTBOARD AILERON DELAMINATION. CHKED BY LEAD TECHNICIAN AND FOUND NO DELAMINATION. 2 DAYS LATER DURING PREPARATION FOR PAINTING DELAMINATION WAS DISCOVERED ON THE AILERON.

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ON FEB/XA/07 I WAS THE LEAD AT THE LINE DURING MY SHIFT. ACFT RPTED POSSIBLE DELAMINATION ON THE L-HAND WING OUTBOARD AILERON. IT WAS CHAOTIC WORK WISE SO I TOOK IT UPON MYSELF AND WENT OUT TO THE ACFT. I PERFORMED THE INSPECTION OF THE AILERON. AT THIS TIME THE ONLY THING I FOUND WAS MISSING PAINT ON THE AILERON. I CONTACTED MAINT FOR A DEFERRED AUTH AND SPOKE TO MAINT. WE DEFERRED THE MISSING PAINT PER AN ENGINEERING TECHNICAL NOTICE FOR 3 DAYS. THE HONEYCOMB WAS FOUND TO BE IN 1 PIECE. NO SEPARATION WAS FOUND AT TIME OF DEFERRAL OF MISSING PAINT. THIS DAY RAMP WAS PERFORMING DEICE ON ACFT AT RAMP. I GOT A CALL THIS MORNING BY MY FELLOW LEAD INFORMING TO DO A REPORT. I WAS INFORMED THAT THE AILERON HAD DELAMINATED DURING THE 3 DAY TIME-FRAME FOR THE TIME DEFERRED MAINT ITEM. I INFORMED DURING THE TIME OF INSPECTION NO DELAMINATION WAS FOUND ONLY PAINT MISSING; SINCE DEICING WAS BEING PERFORMED THAT DAY IT'S MOST LIKELY POSSIBLE THAT THE AILERON DELAMINATED AFTERWARDS DURING ITS SCHEDULE IN AND OUT OF ZZZ.