ERA24LA183

NTSB accident investigation · Aeronca 11AC · Conyers, GA · March 31, 2024

Accident · Minor injuriesClass 4 · LimitedFinal report
Date
March 31, 2024, 13:00 local (17:00 UTC)
Place
Conyers, GA · Pond at the end of runway at GA80
Injuries
1 minor, 1 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N3420EAeronca 11AC
Defining event
Takeoff-rejected takeoff: Runway excursion
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 4 - Basic report with no Prelim publish
NTSB office
Eastern Region Aviation
Parties
FAA/FSDO
FAA report
20240331003759A
Case key
194104

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

An encounter with shifting wind conditions, which resulted in the airplane using more runway than anticipated, an aborted takeoff, and subsequent runway excursion. Contributing to the accident was the pilot’s failure account for the potential of variable and shifting wind in his departure planning.

Findings · 4

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: climb rateAircraft › Aircraft oper/perf/capability · Attain/maintain not possibleAeronca 11AC: 2 casesAll aircraft: 265 casesProbable cause
Wind: variable windEnvironmental issues › Conditions/weather/phenomena · Effect on operationAeronca 11AC: 2 casesAll aircraft: 113 casesProbable cause
Planning/preparation: weather planningPersonnel issues › Task performance · PilotAeronca 11AC: 1 caseAll aircraft: 156 casesProbable cause
Wind: variable windEnvironmental issues › Conditions/weather/phenomena · Awareness of conditionAeronca 11AC: 2 casesAll aircraft: 113 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 was taking off from a 2,700-ft-long runway and described that during the initial climb, the airplane’s climb rate was insufficient to avoid the trees at the departure end of the runway. The pilot attempted to land on the remaining runway; however, the airplane departed the far end of the runway, impacted a berm, and came to rest in a lake. The airplane sustained substantial damage to the wings and fuselage. The pilot reported that the engine was operating normally and that there were no anomalies or mechanical failures that would have precluded normal operation of the airplane. Three of the closest official weather stations reported the wind was varying between being a quartering headwind to a quartering tailwind. The pilot reported receiving the weather conditions from an online, publicly available weather station, which reported that a headwind would be present for takeoff. He also provided a plot of the data from that station for the time surrounding accident, and it showed that while the wind direction was reported as he described, it had also begun to vary around that time, and continued to for some time afterward. Based on this information, it is likely that the variable wind conditions resulted in a shift in wind direction during takeoff that changed from a quartering headwind to a quartering tailwind.

Aircraft

Registration
N3420E
Reported as
Aeronca 11AC (NO SERIES EXISTS)
Category
Airplane
Serial number
11AC-1737
Built
1947
Airframe hours
2,703.4
Engine
Continental A-65-8, 65 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · December 22, 2023 · 3.5 hours before
Departed
GA80 · Conyers, GA
Airport
GA80 · Whispering Pines, runway 15, 2,600 × 20 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
47
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
BasicMed, Without waivers/limitations
Last flight review
June 26, 2022
Seat
Left
Restraint
Lap only
Flight hours
1,014 total · 51.6 in this make and model · 892 as pilot in command · 5.9 in the last 90 days · 3 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
250° at 8 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
73 °F, dew point 55 °F
Altimeter
30.06 inHg
Observed at
CVC, 11 nm away
METAR
METAR KCVC 311755Z AUTO 25008KT 190V290 10SM SCT044 23/13 A3006 RMK AO2=

Docket · 5

The files NTSB released with the investigation on June 21, 2024, on NTSB’s docket system: statements, records, photos and specialists’ reports. 13.2 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.