ANC20CA014

The operator's operations chief reported that an air traffic controller instructed the flight instructor and pilot to taxi to a taxiway and that, subsequently, the airplane encountered prop wash from a larger airplane on the same taxiway, which flipped the airplane onto its right side and resulted in substantial damage to the forward wing spar. The larger airplane's pilot reported that he was conducting a high-power engine run on the same taxiway. The air traffic controller did not tell the pilots in the smaller airplane at any time while they were taxiing about the larger airplane's intentions. The pilot of the larger airplane reported that all requests for engine start, taxi, and high-power engine runs were coordinated with air traffic control (ATC). He added that they had to reposition due to a tailwind and that he had made a radio call to ATC and acknowledged that they had repositioned on the ramp to face into the wind. He added that he heard the lighter airplane receive a taxi clearance but did not hear any communications questioning the larger airplane's status or position with respect to any potential impact on aircraft taxiing behind them on the taxiway. He became aware of the lighter airplane's situation after the event when its pilot made a radio call to ground control.

The Aero Club operations chief reported that, the flight instructor and pilot were on a taxiway under air traffic control (ATC) instruction, the airplane encountered prop wash, originating from a larger (twin engine) turbine-powered airplane performing a maintenance engine(s) run-up. The maintenance run-up was performed in a location adjacent to the active taxiway. The light single-engine airplane was not told by ATC at any time during their taxi of the larger turbine-powered airplane's intentions. Subsequently, the light single-engine airplane was blown from its location while taxing behind the larger turbine-powered airplane, which resulted in substantial damage to the forward wing-spar. The Aero Club operations chief reported that there were no preimpact mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation. The pilot of the larger turbine-powered airplane reported that, all requests for engine start, taxi, and high power runs were coordinated with ATC. He added that they had to reposition due to tailwinds, however a radio call was made to ATC and acknowledged that they had repositioned on the ramp to face into the wind. He added that he heard the light single-engine airplane receive a taxi clearance but did not hear any communications questioning the larger turbine-powered airplane's status or position with respect to any potential impact on aircraft taxiing behind them on the taxiway. He became aware of the light single-engine airplane's situation after the event when the pilot of the light single-engine airplane made a radio call to ground control.