CEN19LA202

NTSB accident investigation · Aeronca L16A · Zelienople, PA · June 29, 2019

Accident · No injuriesClass 3 · LimitedFinal report
Date
June 29, 2019, 14:18 local (18:18 UTC)
Place
Zelienople, PA
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N9325HAeronca L16A
Defining event
Initial climb: Loss of engine power (total)
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 3
NTSB office
Central Region
Parties
FAA Flight Standards District Office
FAA report
20190629008639A
Case key
99760

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

A total loss of engine power due to obstruction of the carburetor air intake by a piece of the air filter gasket that had become detached.

Findings · 2

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.

Fuel system: fuel distributionAircraft › Aircraft systems · InoperativeAeronca 7BCM: 1 caseAll aircraft: 141 casesProbable cause
Fuel system: fuel distributionAircraft › Aircraft systems · Damaged/degradedAeronca 7BCM: 1 caseAll aircraft: 141 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 returning to the airport to practice takeoffs and landings. About 15 minutes into the flight, while flying level at 1,900 ft mean sea level, the engine "abruptly" stopped. The pilot performed a forced landing to a nearby muddy hay field. During the landing roll, the right main landing gear buckled, collapsing the gear rearward and resulting in substantial damage to the right wing and fuselage. Engine control continuity was confirmed, and spark from both magnetos and all spark plugs were noted. A mechanic working on the airplane following the accident reported that a piece of the air filter gasket was lodged in the carburetor intake. It is likely that the obstruction of airflow caused by the gasket resulted in the loss of engine power.

Factual narrative

On June 29, 2019, about 1418 at 1418 eastern daylight time, an Aeronca L-16A (7BCM), N9325H, was substantially damaged when it was involved in an accident near Zelienople, Pennsylvania. The pilot was not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. The pilot took off and after practicing turns in the airplane, returned to the airport to practice takeoffs and landings. The airplane had been airborne about 15 minutes and was level at 1,900 ft msl when the engine "abruptly" stopped. The pilot reported there was no warning or abnormal sounds or rpm changes. The pilot attempted to restart the engine, but it would not restart. He then performed a "dead stick" forced landing to a nearby hay field. After touching down and rolling about 100 ft on the muddy surface, the right main landing gear buckled and the airplane came to a stop. The airplane's right wing and fuselage at the landing gear attach point were substantially damaged and the right main landing gear was bent aft. Federal Aviation Administration (FAA) inspectors confirmed there was engine control continuity and noted spark from both magnetos and all plugs. A mechanic working on the airplane found a piece of the air filter gasket lodged in the carburetor intake. Investigators were unable to determine why the gasket separated from the filter.

Aircraft

Registration
N9325H
Reported as
Aeronca L16A (7BCM)
Category
Airplane
Serial number
47-807
Airframe hours
4,131
Engine
Continental C85-12, 85 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Special light-sport (Special)
Last inspection
Annual · October 31, 2018 · 10 hours before
Departed
PJC · Zelienople, PA
Destination
PJC · Zelienople, PA
Airport
PJC · Zelienople Municipal
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
None
Certificates
Private, Sport Pilot
Airplane ratings
Single-engine sea, Single-engine land
Instrument ratings
Airplane
Medical
Sport pilot, Without waivers/limitations
Last flight review
April 9, 2018
Seat
Front
Restraint
3-point
Flight hours
3,000 total · 3 in this make and model · 3,000 as pilot in command · 3 in the last 90 days · 3 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
160° at 4 knots
Visibility
7 statute miles
Lowest ceiling
8,500 ft broken
Temperature
70 °F, dew point 66 °F
Altimeter
30.10 inHg
Observed at
BTP, 10 nm away

Docket · 5

The files NTSB released with the investigation on October 20, 2020, on NTSB’s docket system: statements, records, photos and specialists’ reports. 2.5 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 N9325H · 1

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