What was found
MAIN CABIN DOOR COUNTER BALANCER NEEDS READJUSTMENT. WHEN CLOSING DOOR ONCE HALF WAY PAST CENTER UP DOOR VIOLENTLY LUNGES UPWARDS WITH DANGEROUS FORCE AND VELOCITY. UNABLE TO REPRODUCE. OPERATED MAIN CABIN DOOR MULTIPLE TIMES, DOOR OPERATES NORMAL AND DOES NOT CLOSE WITH EXCESSIVE FORCE OR VELOCITY. PERFORMED CABLE TENSION CHECK OF COUNTER-BALANCE CABLES, CABLES MEASURE 130LBS AND LIFTING FORCE MEASURED 12.87 LBS. BOTH MEASUREMENTS ARE WITHIN SPECS PER THE AMM. ALL WORK WAS PERFORMED IAW AMM 52-10-03