CEN20CA033

NTSB accident investigation · Piper PA18 · Kerrville, TX · November 23, 2019

Accident · No injuriesData collectionFinal report
Date
November 23, 2019, 11:00 local (17:00 UTC)
Place
Kerrville, TX
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N530AKPiper PA18
Defining event
Landing: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed · report June 16, 2020
Report
Approved by Office Director
NTSB office
Central Region
Case key
100676

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 loss of airplane control during the landing flare, which resulted in a loss of directional control and ground-loop.

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.

Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotPiper PA-18-150: 160 casesAll aircraft: 9,295 casesProbable cause
Performance/control parametersAircraft › Aircraft oper/perf/capability · Not attained/maintainedPiper PA-18-150: 14 casesAll aircraft: 1,269 casesProbable cause
Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedPiper PA-18-150: 98 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 pilot reported that, based on the wind reported by the destination airport's AWOS, he decided to conduct a conventional, full-stall, three-point landing. He said the approach was normal and stabilized. When the airplane was about 1 ft above the runway, a wind gust pushed the airplane left. The left main landing gear contacted the runway, and the airplane drifted right. The left shock absorber broke, and the airplane swerved right. The tailwheel unlocked, and the airplane ground looped, which resulted in substantial damage to the left wing. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.

Factual narrative

. The private pilot was on a cross-country flight with one passenger. He stated that based on the wind reported by his destination airport's Automated Weather Observing System (AWOS), he decided to make a conventional, full-stall, 3-point landing. He said he crossed mid-field and entered a left downwind for runway 30. The turn to base and final were normal. When the airplane was about a foot off the runway at stall speed, "an unexpected" wind gust pushed the airplane to the left. The left main landing gear contacted the runway, and the airplane drifted to the right. The left shock absorber broke, and the airplane swerved to the right. The tailwheel unlocked and the airplane ground looped. Damage included a bent left wing and left main landing gear. The pilot did not indicate the wind direction but said it was at 7 knots. AWOS reported that the wind was calm. The pilot did not indicate that there were any mechanical anomalies with the airplane prior to the accident. He noted that the destination airport "has a reputation for gusty wind conditions . . . the gust caught me in a landing configuration where I was unable to maintain directional control at touchdown." The pilot stated that once the tailwheel turns about 15 to 20 degrees, it unlocks automatically and the tailwheel swivels. When the airplane began its turn and reached the point where the tailwheel unlocked, there is no tailwheel steering.

Aircraft

Registration
N530AK
Reported as
Piper PA18
Category
Airplane
Serial number
18-4385
Built
1956
Airframe hours
4,017
Engine
Lycoming O-360, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · May 30, 2019
Departed
CXO · Conroe, TX
Destination
ERV · Kerrville, TX
Airport
ERV · Kerrville Municipal, runway 30, 6,004 × 100 ft, asphalt
Equipment
Handheld GPS, Onboard weather, ADS-B, Electronic flight bag or handheld device, Electronic multifunction display, Electronic primary flight display

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
62
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 3, With waivers/limitations
Last flight review
March 24, 2019
Seat
Front
Restraint
4-point
Flight hours
2,160 total · 53 in this make and model · 1,750 as pilot in command · 108 in the last 90 days · 75 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
7 knots
Visibility
10 statute miles
Temperature
64 °F, dew point 39 °F
Altimeter
30.27 inHg
Observed at
ERV

Docket · 3

The files NTSB released with the investigation on February 26, 2020, on NTSB’s docket system: statements, records, photos and specialists’ reports. 994 KB in all.

Other investigations on N530AK · 1

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