ERA11CA129

NTSB accident investigation · Kolb Kolb Mark III · Rutherfordton, NC · January 30, 2011

Accident · Serious injuriesData collectionFinal report
Date
January 30, 2011, 14:45 local (19:45 UTC)
Place
Rutherfordton, NC
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N457AKolb Kolb Mark III
Defining event
Maneuvering-low-alt flying: Aerodynamic stall/spin
Weather
Visual (VMC) · Day
Status
Completed · report June 8, 2011
Report
Approved by Office Director
NTSB office
Eastern Region Aviation
Parties
FAA/FSDO
FAA report
20110130001239A
Case key
78237

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

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Probable cause

The pilot's failure to maintain adequate airspeed while maneuvering at low altitude resulting in a stall/spin and ground impact.

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.

Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Not attained/maintainedKolb KOLB MARK III: 1 caseAll aircraft: 1,681 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotKolb KOLB MARK III: 1 caseAll aircraft: 9,295 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

The pilot reported that he was practicing takeoffs and landings at his home airport. As he made a left turn over a hangar, a crosswind increased, and the airplane banked too steeply. The left wing subsequently stalled and the airplane was too low for the pilot to recover. The airplane impacted the ground near a hangar. A witness stated that shortly after takeoff, the airplane returned and made a low pass at the airport. He observed the airplane then fly low over the pilot's restaurant and subsequently stall/spin at low altitude. During the stall, the witness heard the engine noise increase to full power. The pilot reported no preimpact mechanical malfunctions or failures with the airframe or engine that would have precluded normal operation. The recorded weather at the accident airport, about the time of the accident, included clear skies and calm wind.

Factual narrative

The pilot reported that he was practicing takeoffs and landings at his home airport. As he made a left turn over a hangar, a crosswind increased, and the airplane banked too steeply. The left wing subsequently stalled and the airplane was too low for the pilot to recover, before it impacted the ground near a hangar. A witness stated that shortly after takeoff, the accident airplane returned and "buzzed" the airport. The pilot then attempted to "buzz" his own restaurant, when the airplane stalled and spun at low altitude. During the stall, the witness heard the engine noise increase to full power. The pilot reported no preimpact mechanical malfunctions or failures with the airframe or engine that would have precluded normal operation. The recorded weather at the accident airport, about the time of the accident, included clear skies and calm wind.

Aircraft

Registration
N457A
Reported as
Kolb Kolb Mark III
Category
Airplane
Serial number
M-346
Engine
Rotax 912S, 100 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Ronald McKinney
Registered owner
Ronald McKinney
Airworthiness certificate
Special, Experimental (Special)
Departed
FQD · Rutherfordton, NC
Destination
FQD · Rutherfordton, NC
Airport
FQD · Rutherfordton, runway 19, 5,000 × 100 ft, asphalt

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
61
Injuries
Serious
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Seat
Left
Flight hours
450 total · 200 in this make and model · 10 in the last 90 days

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
72 °F, dew point 28 °F
Altimeter
30.00 inHg
Observed at
FQD

Docket · 5

The files NTSB released with the investigation on April 29, 2011, on NTSB’s docket system: statements, records, photos and specialists’ reports. 174 KB 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.