CEN21LA425

NTSB accident investigation · Kolb Mark III · Steamboat Springs, CO · September 14, 2021

Accident · Serious injuriesClass 3 · LimitedFinal report
Date
September 13, 2021, 18:30 local (Sep 14, 2021, 00:30 UTC)
Place
Steamboat Springs, CO · open field
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N4365EKolb Mark III
Defining event
Takeoff: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 3
NTSB office
Central Region
Parties
FAA FSDO
FAA report
20210914016529A
Case key
103901

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 failure to maintain adequate airspeed and his exceedance of the airplane’s critical angle of attack, which resulted in an aerodynamic stall.

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/maintainedByler Dan W KOLB MARK III: 1 caseAll aircraft: 1,681 casesProbable cause
Performance/control parameters: angle of attackAircraft › Aircraft oper/perf/capability · Capability exceededByler Dan W KOLB MARK III: 1 caseAll aircraft: 990 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 flew the airplane with the previous owner in Indiana before purchasing it and driving it on a trailer to Steamboat Springs. A witness reported that the pilot intended to taxi around his private airstrip to get a better feel for the airplane. The airplane subsequently lifted off the ground, cleared several fences, and was about 20 ft above the ground when the airplane’s nose suddenly lowered and impacted the ground. The airplane sustained substantial damage to the fuselage. The pilot told the witness that he did not intentionally lower the nose of the airplane. The pilot later told a family member that he stalled the airplane. The airplane was not made available for investigators to examine.

Factual narrative

On September 13, 2021, at 1830 mountain daylight time, a Kolb Mark III airplane, N4365E, was substantially damaged when it was involved in an accident near Steamboat Springs, Colorado. The pilot sustained serious injuries. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. The pilot’s wife, who witnessed the accident, reported that the pilot recently purchased the airplane. She stated that the pilot flew the airplane with the previous owner in Indiana before driving it on a trailer to Steamboat Springs. On the day of the accident, the pilot intended to taxi the airplane around his private airstrip to get used to the feel of the airplane. The airplane subsequently lifted off, cleared several fences, but only made it about 20 ft above the ground when the airplane’s nose suddenly lowered and impacted the ground. The airplane sustained substantial damage to the fuselage. The witness stated the engine was still running and she was unable to turn it off when she reached the accident site. The pilot told the witness that he did not command the airplane down but that it just fell. The pilot later told a family member that he stalled the airplane. The airplane was not made available for investigators to examine the airframe or flight control system. The pilot did not submit the National Transportation Safety Board Pilot/Operator Aircraft Accident/Incident Report (NTSB Form 6120.1).

Aircraft

Registration
N4365E
Reported as
Kolb Mark III
Category
Airplane, amateur-built
Serial number
M3086
Built
1991
Engine
Rotax 582, 65 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Experimental (Special)
Airport
n/a · Private Strip, runway UNK, grass/turf
Equipment
None

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
69
Injuries
Serious
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Seat
Left

Weather

Conditions
Visual (VMC) · Day
Wind
310° at 7 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
72 °F, dew point 41 °F
Altimeter
30.13 inHg
Observed at
KSBS, 5 nm away
METAR
KSBS 140015Z AUTO 31007KT 10SM CLR 22/05 A3013 RMK AO1 T02160052

Docket · 3

The files NTSB released with the investigation on September 20, 2023, on NTSB’s docket system: statements, records, photos and specialists’ reports. 436 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.