GAA18CA351

NTSB accident investigation · Cessna 185 · Big Lake, AK · June 15, 2018

Accident · No injuriesData collectionFinal report
Date
June 15, 2018, 11:00 local (19:00 UTC)
Place
Big Lake, AK
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N9964XCessna 185
Defining event
Landing: Loss of control on ground
Weather
Visual (VMC) · Day
Status
Completed · report March 18, 2019
Report
Approved by Office Director
NTSB office
General Aviation Accidents
Parties
FAA
FAA report
20180615007979A
Case key
97488

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 inability to maintain directional control during the landing roll due to a flat tire.

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.

Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Attain/maintain not possibleAll aircraft: 3,958 casesProbable cause
Landing gear system: wheel/ski/floatAircraft › Aircraft systems · FailureAll aircraft: 48 casesProbable cause
Runway/land/takeoff/taxi surface: soft surfaceEnvironmental issues › Physical environment · Contributed to outcomeAll aircraft: 264 cases

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 of the tailwheel-equipped airplane reported that, during landing on a gravel airstrip, when the right main wheel touched down, the airplane veered right. He applied full left rudder to no avail. The right wheel exited the runway into soft, sandy soil, and the airplane nosed over. The airplane sustained substantial damage to the wings and empennage. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. The pilot added that, after the accident, it was pointed out that the airplane had a flat tire and that there was a tire mark on the gravel runway from where the airplane touched down to where the airplane nosed over.

Factual narrative

The pilot of the tailwheel-equipped airplane reported that, during landing on a gravel airstrip, when the right main wheel touched down, the airplane veered to the right. He applied full left rudder to no avail. The right wheel exited the runway into soft, sandy soil and the airplane nosed over. The airplane sustained substantial damage to the wings and empennage. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. The pilot added that, after the accident it was pointed out that the airplane had a flat tire, and that there was a tire mark on the gravel runway from where the airplane touched down to where the airplane nosed over.

Aircraft

Registration
N9964X
Reported as
Cessna 185 (UNDESIGNAT)
Category
Airplane
Serial number
185-0164
Built
1961
Airframe hours
2,100.7
Engine
Cont Motor IO-470-F, 260 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Utility
Last inspection
Annual · May 19, 2018
Departed
UUO · Willow, AK
Destination
BGQ · Big Lake, AK
Airport
BGQ · Big Lake, runway 25, 2,450 × 70 ft, gravel
Equipment
Stall warning system, Electronic flight bag or handheld device

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
67
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 1, Waiver time limited special
Last flight review
May 17, 2017
Seat
Left
Restraint
3-point
Flight hours
366.2 total · 362.3 in this make and model · 374.5 as pilot in command

Weather

Conditions
Visual (VMC) · Day
Visibility
10 statute miles
Lowest ceiling
None
Temperature
61 °F, dew point 48 °F
Altimeter
29.96 inHg
Observed at
PAWS, 8 nm away

Docket · 2

The files NTSB released with the investigation on September 27, 2018, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.4 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.