Incident Overview
A Cessna 152 was overturned by propwash from a large military turboprop aircraft during taxi operations. The pilot of the Cessna had received clearance from the tower to taxi into position and hold for takeoff. The pilot was aware that the military aircraft ahead might be conducting periodic engine runs.
Sequence of Events
As the Cessna pilot prepared to taxi past the military turboprop, two of the turboprop's four engines were advanced to a high power setting. The resulting propwash struck the Cessna 152, flipping it onto its back. The crew of the military turboprop, who were monitoring the ground frequency, were not aware that another aircraft was taxiing behind them after being cleared by the tower to taxi into takeoff position and hold.
Communication
The Cessna pilot did not initiate communications to positively ascertain the power settings of the turboprop's engines before attempting to taxi past. No radio calls were made to confirm the engines' status.