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ASN Wikibase Occurrence # 176350
Last updated: 1 December 2021
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Type:Silhouette image of generic WACO model; specific model in this crash may look slightly different
Waco ASO
Registration: N11253
MSN: 3212
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Location:Lexington, KY -   United States of America
Phase: Take off
Departure airport:Lexington, KY (LEX)
Destination airport:Lexington, KY
Investigating agency: NTSB
The pilot initiated his takeoff roll from a runway position where a transport airplane had previously touched down. When the pilot began the takeoff roll, the transport airplane had just cleared the runway. During the takeoff roll, airplane's tail elevation was normal until it "spontaneously" went higher. The pilot lowered the tail; however, it again went higher, and the propeller hit the runway. The pilot again tried to lower the tail, but it went higher still, with a "heavier contact of the propeller," and the airplane then nosed over. The pilot also noted that there "seemed to be some lateral turbulence during the takeoff." At the time of the accident, there was a 3-knot, quartering tailwind. According to FAA Advisory Circular 90-23F, "Aircraft Wake Turbulence," a light quartering tailwind "requires maximum caution." In addition, "Whether or not a warning or information has been given, the pilot is expected to adjust aircraft operations and flight path as necessary to preclude serious wake encounters."
Probable Cause: The pilot's inadequate remedial action to wake turbulence. A factor was the pilot's failure to recognize that the takeoff conditions were conducive to wake turbulence.




Revision history:

24-May-2015 16:35 Noro Added
21-Dec-2016 19:30 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
07-Dec-2017 17:54 ASN Update Bot Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative]

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