# Accident 20101103052879A: Welch Thoma RV9, Sac City, IA, November 3, 2010

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: November 3, 2010, 18:00 local time
- Place: Sac City, IA
- Damage: Substantial damage
- Phase of flight: Landing: Touchdown
- Operating rules: General operating rules (Part 91)
- Location: 42.3792° N, 94.9797° W: From the FAA
- Nearby events: https://openairdocs.org/map.md?lat=42.3792&lon=-94.9797&mi=10
- Aircraft: N475TW, a cancelled registration (https://openairdocs.org/deregistered/N475TW-2014-10-27) (OpenAirDocs)
- Registry model: Welch Thomas RV9 (registry code 05617WD, https://openairdocs.org/model/welch-thomas-rv9) (OpenAirDocs)
- Registry engine: Amateur-built UNKNOWN ENG (registry code 99999, https://openairdocs.org/engine/amateur-built-unknown-eng) (OpenAirDocs)
- Reported make and model: WELCH THOMA RV9
- Reported engine: AMA/EXPR UNKNOWN ENG
- People aboard: 1
- Fatal injuries: 0
- Other injuries: 0
- Pilot certificates: Private pilot
- Pilot flight hours: 315 total, 70 in this make and model, 47 in the last 90 days
- NTSB investigation: [NTSB CEN11CA065](https://openairdocs.org/ntsb/CEN11CA065) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20101103052879A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

PILOT FAILED TO MAINTAIN CONTROL OF THE AIRCRAFT WHILE PERFORMING A LANDING IN GUSTING CONDITIONS. THE PILOT, WHO WAS THE ONLY OCCUPANT, WAS NOT INJURED. THIS AIRPORT, SAC CITY MUNICIPAL, AT SAC CITY, IOWA, HAS TERRAIN FEATURES TO THE WEST THAT WILL SET UP SOME SEVERE UP AND DOWN DRAFTS ACROSS THE CENTER OF THE AIRPORT. THIS LOCAL WEATHER PHENOMENON WAS PROVIDED BY THE CHAIRMAN OF THE SAC CITY AIRPORT COMMISSION. THE PILOT STATED, AS THE AIRCRAFT WAS IN THE FLARE, HE WAS CAUGHT IN AN UP DRAFT TO ABOUT TWENTY FEET, FOLLOWED IMMEDIATELY BY A DOWN DRAFT INTO THE GROUND, BEFORE HE WAS ABLE TO EFFECTIVELY PERFORM A GO AROUND. THE AIRCRAFT RECEIVED SUBSTANTIAL DAMAGE WHEN THE MAIN LANDING GEAR WAS FOLDED UNDER THE WING AND FUSELAGE. THE WEATHER AT CARROLL, IOWA WAS 032255Z KCIN 032255Z AUTO 320/22G28KT 10 SM CLR 13/M10 A30.10.

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB CEN11CA065](https://openairdocs.org/ntsb/CEN11CA065), Nov 3, 2010: Welch Thomas RV9 (N475TW), Sac City, IA, substantial damage. Probable cause: The pilot's loss of directional control while landing with a gusting wind.

## Other reports on N475TW (1)

Matched to the same aircraft by N-number and date.

- [Accident 20071014021929A](https://openairdocs.org/incident/20071014021929A), Oct 14, 2007: Amtr RV9 (N475TW), Big Fork, MT, Substantial damage. (-23) On 14 October 2007, at 1430 MDT, a homebuilt RV-9, N475TW, registered to [privacy data omitted], collided with a fence post when the aircraft landed…

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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