ERA11CA007

NTSB accident investigation · Aeronca 11AC · Taylorsville, KY · October 4, 2010

Accident · Minor injuriesData collectionFinal report
Date
October 4, 2010, 09:10 local (13:10 UTC)
Place
Taylorsville, KY
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N85888Aeronca 11AC
Defining event
Approach-VFR pattern final: Controlled flight into terr/obj (CFIT)
Weather
Visual (VMC) · Day
Status
Completed · report March 16, 2011
Report
Approved by Office Director
NTSB office
Eastern Region Aviation
Parties
FAA/FSDO
Case key
77494

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 clearance from an unmarked power line during the final approach to land.

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.

Object/animal/substance: wireEnvironmental issues › Physical environment · Not specifiedAeronca 11AC: 1 caseAll aircraft: 588 cases
Action: incorrect action selectionPersonnel issues › Action/decision · PilotAeronca 11AC: 2 casesAll aircraft: 397 casesProbable cause
Performance/control parameters: descent/approach/glide pathAircraft › Aircraft oper/perf/capability · Not attained/maintainedAeronca 11AC: 1 caseAll aircraft: 809 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, he was on the final leg in the traffic pattern intending to land. As the airplane approached the runway, he observed it begin to pass over the unmarked power lines in the area. He affixed his focus back to the runway and the windshield shattered as it collided with another smaller, unmarked power line located 30 feet above the power lines that the pilot had in sight. After the airplane began a steep descent, the pilot was able to partially recover the attitude prior to impacting the ground at a 45-degree angle. During the accident sequence, the forward section of the fuselage, the firewall, and both wings incurred substantial damage. The pilot reported no preimpact mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Factual narrative

According to the pilot, he was on the final leg in the traffic pattern intending to land on runway 14, a 1,500-foot runway. As he approached the runway, he noted to himself that he had “the [unmarked] power lines made,” approximately 25 feet below the airplane, and glanced back towards the runway. Then, the windshield shattered as the airplane struck another smaller, unmarked power line located 30 feet above the power lines that the pilot had in sight. After the airplane began a steep descent, the pilot was able to partially recover the attitude prior to impacting the ground at a 45-degree angle. During the accident sequence, the forward section of the fuselage, the firewall, and both wings incurred substantial damage. The pilot did not report any mechanical anomalies with the airplane. The winds reported at an airport 18 miles to the northwest of the accident location were calm.

Aircraft

Registration
N85888
Reported as
Aeronca 11AC
Category
Airplane
Serial number
11AC-293
Airframe hours
1,454
Engine
Cont Motor A&C65 SERIES, 65 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · November 26, 2009
Departed
73KY · Brooks, KY
Destination
3KY3 · Taylorsville, KY
Airport
3KY3 · Mason Valley Airport, runway 14, 1,500 × 200 ft, grass/turf

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
50
Injuries
Minor
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Without waivers/limitations
Last flight review
February 8, 2010
Seat
Left
Flight hours
857 total · 27 in this make and model · 817 as pilot in command · 9 in the last 90 days · 5 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
52 °F, dew point 45 °F
Altimeter
30.02 inHg
Observed at
LOU, 18 nm away

Docket · 5

The files NTSB released with the investigation on November 7, 2010, on NTSB’s docket system: statements, records, photos and specialists’ reports. 597 KB in all.