WPR20FA086

NTSB accident investigation · Cessna 140 · Sonora, CA · February 6, 2020

Accident · FatalClass 3 · FieldFinal report
Date
February 5, 2020, 18:07 local (Feb 6, 2020, 02:07 UTC)
Place
Sonora, CA
Injuries
2 fatal
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N9474ACessna 140
Weather
Visual (VMC) · Dusk
Status
Completed
Report
Approved by Office Director
Investigation class
Class 3
NTSB office
Western Pacific Region
Parties
Federal Aviation Administration, Textron Aviation
FAA report
20200205005399A
Case key
100904

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

The pilot’s failure to maintain clearance from trees during approach for landing.

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.

Performance/control parameters: altitudeAircraft › Aircraft oper/perf/capability · Not attained/maintainedCessna 140A: 3 casesAll aircraft: 1,310 cases
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotCessna 140A: 12 casesAll aircraft: 9,295 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 performed an uneventful cross-country flight to take the passenger to a business meeting. He intended to complete the trip during the day (and return to the home airport by 1700), so he would not have to fly at night. Radar data indicated the airplane stopped at four airports before departing for the final leg to the home airport. The final stop included fueling the airplane with approximately 20 gallons of 100 low-lead aviation fuel and departing at 1702. The airplane flew on a northbound heading for about an hour, varying its altitude between 2,000 and 3,000 ft mean sea level (msl) as it continued toward the home airport. When the airplane was about 1.5 nautical miles (nm) from the runway, it turned slightly to the right, consistent with a straight-in approach. It descended gradually until track data were lost about .75 nm from the approach end of the runway. The airplane impacted a tree with its left wing and then continued about 300 ft before coming to rest inverted between two trees. The accident occurred 39 minutes after sunset and 11 minutes after dusk. A witness near the accident site reported that he was working on his ranch when the daylight started to fade. He estimated it was around dusk when he heard a loud bang. He looked toward the noise and saw the airplane for about 3 seconds before he heard another bang, followed by silence. Prior to that, he heard the airplane's engine and noted it was not making any unusual sounds. A postaccident examination of the airframe and engine revealed no evidence of mechanical malfunctions or failures that would have precluded normal operation. The fact that the pilot did not want to fly at night indicated some apprehension on his part, and his night flying experience could not be determined. It is possible the pilot was distracted by the night conditions and unaware of what the approach to the airport looked like at night. He likely did not see the tree along the flightpath before the airplane’s impact.

Factual narrative

On February 5, 2020, at 1807 Pacific standard time, a Cessna 140A airplane, N9474A, was substantially damaged when it was involved in an accident in Columbia, California. The private pilot and passenger were fatally injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. According to the pilots' wife, the purpose of the flight was to take the passenger to Pismo Beach, California, for a business meeting. The intent was to complete the trip during the day so he would not have to fly at night. The flight was expected to return to Columbia Airport (O22), Columbia, California by 1700 the day of the accident. According to recorded radar data provided by the Federal Aviation Administration (FAA), the flight departed O22 and was tracked to Oceano County Airport (L52), Oceano, California. The flight departed L52 at 1543 and flew toward New Coalinga Municipal Airport (C80), Coalinga, California. The flight then flew from C80 to Harris Ranch Airport (3O8), Coalinga, California. Radar data indicated the airplane departed 3O8 about 1702 on a northbound heading. The airplane’s altitude varied between 2,000 and 3,000 ft mean sea level (msl) as it continued toward O22. When the airplane was about 1.5 nautical miles (nm) from runway 35 at O22, it turned slightly to the right, consistent with a straight-in approach to runway 35, descending slightly until track data was lost about .75 nm from the approach end of runway 35. A witness near the accident site reported that he was working on his ranch when the daylight started to fade. He estimated it was around dusk when he heard a loud bang. He looked toward the noise and saw the airplane for about 3 seconds before he heard another bang followed by silence. Prior to that he heard the airplane's engine and noted it was not making any unusual sounds. The first identified point of impact was a 50-foot pine tree about 300 ft south of the main wreckage where portions of the left wing were found. The airplane came to rest inverted in-between two trees in a pasture at an elevation of 2,020 ft msl. The right wing separated and came to rest in low-lying branches. The left wing had partially separated and was wrapped around a tree. The empennage and the tail section remained attached to the cabin area with the tail section raised and leaning against a tree. The engine remained attached to the firewall in its normal position on the airframe; however, the propeller separated and came to rest underneath the right side of the airplane. A postaccident examination of the airplane revealed both fuel tanks were breached, and about 1 gallon of fuel was drained from the LEFT fuel tank. The fuel color was blue and it tested negative for water contamination. The engine was rotated by hand at the accessory section; valve train continuity was established throughout the engine and thumb compression was obtained on all cylinders. The magnetos remained attached to their respective mounting pads;both magnetos produced spark at their respective leads. The oil screen contained a small amount of metal shavings and organic debris. The carburetor also had some organic matter in the inlet screen; however, the carburetor was disassembled with no anomalies noted. Fuel records obtained from 3O8, indicated that the airplane was fueled with approximately 20 gallons of 100 low-lead aviation fuel at 1656. A review of the airplane’s logbooks indicated the last annual inspection was conducted on October 15, 2016. Weather recorded at O22 at 1755 included 10 miles visibility and clear skies. Sunset occurred at 1729 and dusk was recorded at 1756. The investigation was unable to determine the pilot’s total or recent flight time, including flight time at night.

Aircraft

Registration
N9474A
Reported as
Cessna 140 (A)
Category
Airplane
Serial number
15295
Built
1949
Airframe hours
8,854.6
Engine
Continental C-90-12F, 90 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · October 15, 2016 · 76.7 hours before
Departed
3O8 · Coalinga, CA
Destination
Same as departure
Airport
O22 · Columbia
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
73
Injuries
Fatal
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Toxicology
Performed
Flight hours
2,500 total · 0 in this make and model

Weather

Conditions
Visual (VMC) · Dusk
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
48 °F, dew point 32 °F
Altimeter
30.17 inHg
Observed at
KO22
METAR
METAR KO22 060155Z AUTO 00000KT 10SM CLR 09/M00 A3017 RMK A01=

Docket · 10

The files NTSB released with the investigation on October 25, 2022, on NTSB’s docket system: statements, records, photos and specialists’ reports. 14.7 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 N9474A · 2

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