Narrative:

The crew had informed me of a write-up about a #1 torque problem. The write-up was as follows: #1 torque reduces to 60% when bleed is turned on after takeoff. The needed power lever correction results in a power lever split. Another mechanic and I had decided to run the aircraft to confirm the problem. We moved all of the cones around the aircraft and set them aside. We then performed a quick walk-around of the aircraft to ensure the aircraft was ready for a run and determined ramp was good to run at high power settings. I noticed my partner making sure the chocks were tightly against the tires; and I went around again and kicked the chocks tightly against the tires to make sure. Once [the] aircraft was prepped and ready for an engine run; we climbed into the cockpit shutting the main cargo door behind us. My partner took the left seat while I took the right seat. I had informed him that he would monitor the gauges and be in control of the aircraft while I watched to make sure we would not slide and verify the problem the crew had informed me about with the torque. After engines stabilized; we brought the condition levers to max and then the power levers to 80%. After about 5 seconds of the plane being at 80% torque; I started yelling 'stop; stop; stop!' as I noticed the plane starting to move. My partner immediately brought the power levers to reverse to stop the aircraft. Once the aircraft was stopped; we shut the aircraft down as per the checklist and went to assess the damage. Found dc power receptacle to be bent and the receptacle pins to be strong. No cracking was found around the receptacle. Also found right main gear door to be broken off. Did inspection of prop blades and found no evidence of a prop strike with either the gpu or gpu cord. [We] secured aircraft and contacted maintenance control. It has been determined by our assessment that we did everything possible to avoid this situation. Note: 4;500 pounds fuel on board. Aircraft sliding distance 55.7 ft. Suggest sanding the ramp; pulling gpu when running engines at high power.

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Original NASA ASRS Text

Title: Two Mechanics report preforming a high power runup on an ATR42 with the parking brake set and chocks in front of all wheels. At 80% torque the aircraft begans to slide resulting in damage to the ground power receptacle and a main gear door before the aircraft was stopped.

Narrative: The crew had informed me of a write-up about a #1 torque problem. The write-up was as follows: #1 torque reduces to 60% when bleed is turned on after takeoff. The needed power lever correction results in a power lever split. Another Mechanic and I had decided to run the aircraft to confirm the problem. We moved all of the cones around the aircraft and set them aside. We then performed a quick walk-around of the aircraft to ensure the aircraft was ready for a run and determined ramp was good to run at high power settings. I noticed my partner making sure the chocks were tightly against the tires; and I went around again and kicked the chocks tightly against the tires to make sure. Once [the] aircraft was prepped and ready for an engine run; we climbed into the cockpit shutting the main cargo door behind us. My partner took the left seat while I took the right seat. I had informed him that he would monitor the gauges and be in control of the aircraft while I watched to make sure we would not slide and verify the problem the crew had informed me about with the torque. After engines stabilized; we brought the condition levers to max and then the power levers to 80%. After about 5 seconds of the plane being at 80% torque; I started yelling 'STOP; STOP; STOP!' as I noticed the plane starting to move. My partner immediately brought the power levers to reverse to stop the aircraft. Once the aircraft was stopped; we shut the aircraft down as per the checklist and went to assess the damage. Found DC power receptacle to be bent and the receptacle pins to be strong. No cracking was found around the receptacle. Also found right main gear door to be broken off. Did inspection of prop blades and found no evidence of a prop strike with either the GPU or GPU cord. [We] secured aircraft and contacted Maintenance Control. It has been determined by our assessment that we did everything possible to avoid this situation. NOTE: 4;500 LBS fuel on board. Aircraft sliding distance 55.7 FT. Suggest sanding the ramp; pulling GPU when running engines at high power.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.