ANC20LA077

NTSB accident investigation · Cessna 180 · Kenai, AK · August 5, 2020

Accident · No injuriesClass 4 · LimitedFinal report
Date
August 5, 2020, 13:30 local (21:30 UTC)
Place
Kenai, AK
Injuries
4 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N9712GCessna 180
Defining event
Landing-landing roll: Loss of control on ground
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 4 - Basic report with no Prelim publish
NTSB office
Alaska Regional Office
Parties
Federal Aviation Administration
FAA report
20200805014269A
Case key
101752

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 improper decision to place a passenger and baggage in the rear baggage compartment, which resulted in an aft center of gravity, an increase in directional instability, and affected the pilot’s ability to maintain directional control, resulting in a ground loop during the landing roll.

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.

Aircraft capability: cG/weight distributionAircraft › Aircraft oper/perf/capability · Capability exceededCessna 180H: 1 caseAll aircraft: 66 casesProbable cause
Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Attain/maintain not possibleCessna 180H: 29 casesAll aircraft: 3,958 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 airline transport pilot reported that during the landing roll, the airplane immediately veered right as the tailwheel contacted the runway. The pilot applied full left rudder to no avail, and the airplane ground looped to the right. The left main landing gear collapsed, and the left wing and horizontal stabilizer were substantially damaged. The pilot stated that the right brake may have dragged and that the tailwheel may have tilted over during the touchdown. Postaccident examination of the runway marks, brakes, and tailwheel revealed no preaccident mechanical malfunctions or failures that would have precluded normal operation. The wind was reported as 30° right of runway heading at 4 knots. According to first responders, three passengers were sitting in the airplane’s front two rows, and one passenger and multiple bags were in the rear baggage compartment, which was not equipped with a seat. This likely resulted in the airplane having an aft center of gravity and increased the airplane’s tendency to weathervane into the wind and the airplane’s directional instability.

Aircraft

Registration
N9712G
Reported as
Cessna 180 (H)
Category
Airplane
Serial number
18052212
Built
1971
Airframe hours
6,386
Engine
Continental O-470-50, 275 hp, reciprocating
Damage
Substantial damage
Flight
Part 135
Operator
Minta Inc, doing business as Bigfoot Air
Registered owner
Reynolds Frederick A
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · February 26, 2020
Departed
PAPN · Pilot Point, AK
Destination
Same as departure
Airport
ENA · Kenai Muni, runway 02R, 7,855 × 150 ft, asphalt
Equipment
Handheld GPS

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
66
Injuries
None
Certificate
Airline transport
Airplane ratings
Multi-engine land, Single-engine sea, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Seat
Front
Flight hours
9,500 total · 7,500 in this make and model · 9,500 as pilot in command · 35 in the last 90 days · 15 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
230° at 4 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
64 °F, dew point 50 °F
Altimeter
29.67 inHg
Observed at
PAEN

Docket · 4

The files NTSB released with the investigation on June 3, 2021, on NTSB’s docket system: statements, records, photos and specialists’ reports. 5.9 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.