Probable cause
The pilot's loss of directional control while landing with a gusting wind.
NTSB analysis
According to the pilot, the weather information he obtained en route indicated that the wind at his destination airport was from 300 degrees at 25 knots. The airplane encountered turbulence and wind gusts while on final approach and, despite the pilot’s control inputs, the airplane impacted terrain off the right side of the runway. The wind reported 25 miles from the accident site, about 15 minutes after the accident, was from 310 degrees at 23 knots gusting to 33 knots. The wings, firewall, and fuselage sustained substantial damage.
Text from the NTSB. Open the NTSB docket for CEN11CA065 for the full record.
Event
- Date
- Nov 3, 2010
- Type
- Accident
- Place
- Sac City, Iowa
- Nearest airport
- Sac City Municipal (SKI)
- Highest injury
- None
- Weather
- Visual (VMC)
- Light
- Day
Amateur-built RV9
- N-number
- N475TW
- Category
- Airplane
- Damage
- Substantial
- Operating rule
- Part 91 (general aviation)
- Purpose of flight
- Personal
From the NTSB aviation accident database: N-registered aircraft, events since 2008, data through Oct 28, 2026. The file is published monthly, so the latest weeks are incomplete and recent records can change. The official source is the NTSB aviation investigation search. CheckAero is independent and not affiliated with the NTSB.