CEN11CA065

NTSB accident investigation · Welch Thomas RV9 · Sac City, IA · November 3, 2010

Accident · No injuriesData collectionFinal report
Date
November 3, 2010, 17:00 local (22:00 UTC)
Place
Sac City, IA
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N475TWWelch Thomas RV9
Defining event
Landing-flare/touchdown: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed · report April 12, 2011
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA-DSM-FSDO
FAA report
20101103052879A
Case key
77773

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

Probable cause

The pilot's loss of directional control while landing with a gusting wind.

Findings · 3

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

TurbulenceEnvironmental issues › Conditions/weather/phenomena · Effect on operationWelch Thomas RV9: 1 caseAll aircraft: 92 cases
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotWelch Thomas RV9: 1 caseAll aircraft: 9,295 casesProbable cause
Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedWelch Thomas RV9: 1 caseAll aircraft: 3,958 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

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.

Factual narrative

The pilot obtained the weather information from Flight Watch during the flight. The pilot reported the local winds at his destination airport were from 300 degrees at 25 knots, so he elected to land on runway 32. The airplane encountered turbulence on final approach and at an altitude of 20 feet above the runway, the airplane unexpectedly began to gain altitude. The pilot pushed the control stick forward, but the airplane continued to gain altitude. The pilot reported that at 50 feet above the runway, he encountered turbulence and the nose of the airplane dropped abruptly. He added power and pulled back on the control stick, but the airplane impacted the terrain about 10 feet off the right side of the runway, coming to rest about 40 - 50 feet from the point of impact. The winds reported 25 miles from the accident site, about 15 minutes after the time of the accident, were from 310 degrees at 23 knots gusting to 33 knots. The wings, firewall, and fuselage sustained substantial damage.

Aircraft

Registration
N475TW
Reported as
Welch Thomas RV9
Category
Airplane, amateur-built
Serial number
90475
Airframe hours
446
Engine
Nsi EJ25, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Micheal L. Harmon, Jr.
Registered owner
Micheal L. Harmon, Jr.
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Condition · April 7, 2010 · 85 hours before
Departed
1H2 · Effingham, IL
Destination
SKI · Sac City, IA
Airport
SKI · Sac City Municipal, runway 32, 2,350 × 60 ft, concrete

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
35
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Without waivers/limitations
Last flight review
June 5, 2010
Seat
Left
Flight hours
305 total · 90 in this make and model · 240 as pilot in command · 70 in the last 90 days · 28 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
310° at 23 knots, gusting 33
Visibility
10 statute miles
Lowest ceiling
None
Temperature
59 °F, dew point 9 °F
Altimeter
30.09 inHg
Observed at
CIN, 25 nm away

Docket · 1

The files NTSB released with the investigation on December 10, 2010, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.1 MB in all.

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.

Other investigations on N475TW · 1

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