ERA22LA294

NTSB accident investigation · Bucker BU-133 · Hartford, KY · June 24, 2022

Accident · Serious injuriesClass 3 · LimitedFinal report
Date
June 24, 2022, 14:25 local (19:25 UTC)
Place
Hartford, KY · Adjacent to runway
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N1940HBucker BU-133
Defining event
Initial climb: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 3
NTSB office
Eastern Region Aviation
Parties
FAA/FSDO
FAA report
20220624011039A
Case key
105387

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 exceedance of the airplane’s critical angle of attack during the initial climb, which resulted in an aerodynamic stall during an attempted return to the runway.

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.

Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotBucker BU-133: 1 caseAll aircraft: 9,295 casesProbable cause
Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Not attained/maintainedBucker BU-133: 1 caseAll aircraft: 1,681 casesProbable cause
Performance/control parameters: angle of attackAircraft › Aircraft oper/perf/capability · Not attained/maintainedBucker BU-133: 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

Witnesses reported that, during takeoff, the airplane became airborne about 1,000 ft down the 5,000-ft-long runway and immediately pitched up to a nose-high attitude with little increase in altitude. The witnesses also reported that the engine ran smoothly during the entire event. As the airplane passed the departure end of the runway, it made a slight right turn, followed by a sharp turn to the left back toward the runway. During the left turn, the nose dropped, and the airplane impacted the ground past the end of the runway in a left-wing-low attitude. Examination of the airplane revealed no evidence of a preexisting mechanical malfunction or failure that would have precluded normal operation. Given the witness statements and the lack of mechanical anomalies, it is likely that the pilot exceeded the airplane’s critical angle of attack while attempting to return to the airport during the initial climb, which resulted in an aerodynamic stall, loss of control, and impact with terrain.

Factual narrative

On June 24, 2022, about 1425 central daylight time, a Bücker BU-133, N1940H, was substantially damaged when it was involved in an accident near Hartford, Kentucky. The private pilot was seriously injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. Witnesses reported that the pilot refueled the airplane and started the engine with the assistance of a mechanic, who hand-propped the engine. After engine start, the pilot taxied for departure. The airplane became airborne about 1,000 ft down the 5,000-ft-long runway and immediately pitched up into a nose-high attitude with little increase in altitude. The witnesses also reported that the engine ran smoothly during the entire event. As the airplane passed the departure end of the runway, it made a slight right turn, followed by a sharp turn to the left, back toward the runway. The airplane stalled, the nose dropped, and the airplane impacted the ground. First responders assisted the pilot out of the wreckage and he was transported to a local hospital for treatment. An inspector with the Federal Aviation Administration (FAA) responded to the accident site and examined the wreckage. The airplane crashed in an open, grassy area about 400 ft past the departure end of the runway. The left wing and forward fuselage sustained substantial damage. There was no fire. Continuity was established from all flight control surfaces to the cockpit controls. The elevator trim was found in the neutral position. The FAA reported that, due to his injuries, the pilot had no recollection of the event.

Aircraft

Registration
N1940H
Reported as
Bucker BU-133
Category
Airplane
Serial number
37
Built
1940
Airframe hours
1,475
Engine
Seimens SH14A4, 160 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Condition · May 25, 2022
Airport
JDQ · Ohio County, runway 3, 5,003 × 75 ft, asphalt
Equipment
Unknown

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
65
Injuries
Serious
Certificate
Private
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
BasicMed, Without waivers/limitations
Last flight review
November 3, 2021
Seat
Center
Flight hours
2,925 total

Weather

Conditions
Visual (VMC) · Day
Visibility
10 statute miles
Lowest ceiling
None
Temperature
90 °F, dew point 59 °F
Altimeter
30.00 inHg
Observed at
OWB, 23 nm away
METAR
KOWB 242056Z VRB05KT 10SM CLR 32/15 A3000 RMK AO2 SLP154 T03170150 56010

Docket · 7

The files NTSB released with the investigation on November 15, 2023, on NTSB’s docket system: statements, records, photos and specialists’ reports. 33.8 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 N1940H · 1

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