Narrative:

During a high power performance run; at approximately 96% torque; the parking brake handle released and the plane lurched forward; jumping the chocks. The left engine struck the gpu and damaged the #1 propeller. The aircraft movement was stopped by applying the toe brakes; retarding the throttles and reapplying parking brake. [In the future] chock all three gear; remove gpu from run area.

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Original NASA ASRS Text

Title: A Maintenance Technician described an engine high power run where the parking brake became released; which resulted in the propeller contacting a piece of ground equipment.

Narrative: During a high power performance run; at approximately 96% torque; the parking brake handle released and the plane lurched forward; jumping the chocks. The left engine struck the GPU and damaged the #1 propeller. The aircraft movement was stopped by applying the toe brakes; retarding the throttles and reapplying parking brake. [In the future] chock all three gear; remove GPU from run area.

Data retrieved from NASA's ASRS site 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.