Cessna 172
Tokyo, December 15, 2019
Event Information
| Date | December 15, 2019 |
| Event Type | ACC |
| Location | Tokyo |
| Country | JA |
| Coordinates | 35.74111, 139.34666 |
| Airport | Yokota Air Base |
| Highest Injury | NONE |
| NTSB Number | ANC20CA014 |
| Event ID | 20200114X55301 |
Aircraft
| Make | Cessna |
| Model | 172 |
| Registration # | N22905 |
| Operator | Yokota Aero Club |
| Owner | Yokota Aero Club |
| Category | AIR |
| FAR Part | 091 |
| Aircraft Damage | SUBS |
Conditions
| Light Condition | DAYL |
| Weather | VMC |
Injuries
| Fatal | 0 |
| Serious | 0 |
| Minor | 0 |
| None | 2 |
| Total Injured | 0 |
Event Location
Probable Cause
The airplane’s encounter with prop wash while taxiing behind a larger airplane that was conducting a high-power engine run on the same taxiway. Contributing to the accident was the air traffic controller’s failure to inform the smaller airplane’s pilot about the larger airplane pilot’s intentions.
Full Narrative
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.
About This NTSB Record
This aviation event was investigated by the National Transportation Safety Board (NTSB). NTSB investigates all U.S. civil aviation accidents to determine probable cause and issue safety recommendations to prevent future accidents.