MECHS WORKING ON A B737-300 WING TRAILING EDGE HYD LINE; FAIL TO REMOVE A RUBBER WHEEL CHOCK THAT WAS USED TO HOLD UP THE #2 FLT SPOILER.

Narrative

WHILE TRYING TO VISUALLY INSPECT THE HYD LINE ROUTING FOR #3 FLT SPOILER; I USED A RUBBER WHEEL CHOCK TO BLOCK UP THE #3 SPOILER BOARD. AFTER MY INSPECTION; I NEGLECTED TO REMOVE THE WHEEL CHOCK. HYD PWR WAS APPLIED AND ACFT DAMAGE OCCURRED TO THE UPPER FIXED TRAILING EDGE PANEL AND SUPPORT ROD. IT WAS DISCOVERED BY ANOTHER MECH WORKING AROUND THE ACFT. THE FACTORS CONTRIBUTING TO THIS WERE MY EXTREME NEGLIGENCE. I WAS IN SUCH A HURRY TO FIND THE RIGHT FIX FOR MY ACFT; THAT I FAILED TO USE THE NECESSARY SAFETY AND WORK AREA PRECAUTIONS RESULTING IN 2 UNSERVICEABLE ACFT. THE TIME I SAVED 'CUTTING CORNERS' WAS LOST; AND THEN SOME; BY NOT GOING TO THE TOOL WINDOW AND GETTING THE SPOILER LOCKS. WHILE OUR WORKLOAD WAS HVY; WE COULD HAVE ALL WORKED TOGETHER AND DONE OUR NORMAL 'GET THE PLANE FIXED' TEAMWORK. SUPPLEMENTAL INFO FROM ACN 784775: WHILE WORKING ON ACFT WE REMOVED A TEMP HYD LINE. I WENT UPSTAIRS (COCKPIT) AND TURNED ON HYDS AND RAISED SPOILERS. THEN WENT DOWNSTAIRS AND LOOKED AT LINES (NOT REALIZING A CHOCK WAS BEING USED TO HOLD THEM UP AFTER I SHUT HYD OFF). I NEVER TOOK NOTE OF THE CHOCK. I SHOULD HAVE SLOWED DOWN AND DOUBLECHKED THE AREA BEFORE CONTINUING TO LOWER THE SPOILERS.