CEN16TA194

NTSB accident investigation · North American AT6 · Mason, MI · May 18, 2016

Accident · No injuriesFinal report
Date
May 18, 2016, 15:20 local (19:20 UTC)
Place
Mason, MI
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N757LFNorth American AT6
Defining event
Landing-landing roll: Loss of control on ground
Weather
Visual (VMC) · Day
Status
Completed · report December 16, 2019
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA
FAA report
20160518004679A
Case key
93238

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 directional control during the landing roll in gusting crosswind conditions, which resulted in a runway excursion and impact with a ditch.

Findings · 5

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 · PilotNorth American AT-6D: 7 casesAll aircraft: 9,295 casesProbable cause
Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedNorth American AT-6D: 5 casesAll aircraft: 3,958 casesProbable cause
Wind: gustsEnvironmental issues › Conditions/weather/phenomena · Effect on operationNorth American AT-6D: 2 casesAll aircraft: 1,199 casesProbable cause
Terrain: sloped/uneven terrainEnvironmental issues › Physical environment · Effect on operationNorth American AT-6D: 1 caseAll aircraft: 270 cases
Wind: crosswindEnvironmental issues › Conditions/weather/phenomena · Effect on operationNorth American AT-6D: 1 caseAll aircraft: 1,008 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 commercial pilot of the tailwheel-equipped airplane reported that, during the landing roll on runway 10, the airplane encountered a wind shift and gust. He stated that he added aileron flight control input to "counteract the wind shift" but that the airplane "veered/looped" to the left, exited the runway, and continued into a ditch. The airplane sustained substantial damage to the left wing structure. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. The airport's automated weather observation station reported that, about 14 minutes after the accident, wind was from 00° at 5 knots, gusting to 14 knots. Given the evidence, the pilot likely lost directional control during the landing roll in gusting crosswind conditions.

Factual narrative

On May 18, 2016, about 1520 eastern daylight time, a tail-wheel equipped North American AT-6D, N757LF, departed the left side of the runway while landing at Mason Jewett Field Airport (TEW), Mason, Michigan. The airplane sustained substantial damage to the left-wing structure. The commercial pilot, the sole occupant, was not injured. The airplane was registered to and operated by a private individual under the provisions of Title 14 Code of Federal Regulations Part 91 as a personal flight. Day visual meteorological conditions prevailed for the flight, and no flight plan was filed. The flight originated from the Brooks Field Airport (RMY), Marshall, Michigan, at 1455 was destined for TEW. The pilot reported that he checked the automated weather report at TEW while about 10 miles from the airport, and again on short final for landing. He said both times the weather report stated the winds were from 090º at 6 kts, favoring runway 10. The airplane touched down normally on runway 10, prior to the 1,000-ft markers on the runway. On rollout, prior to the halfway point of 2,000 ft, there was a wind shift, and he encountered a gust of wind in a "northerly direction." He added aileron flight control input to "counteract the wind shift" but the airplane "veered/looped" to the left. The airplane exited the left side of the runway and came to rest in a drainage ditch near the runway. At 1514, the automated weather observation system (AWOS) at TEW reported wind from 040º at 5 kts, visibility 10 miles, scattered clouds at 6,500 ft, temperature 17ºC, dew point 2ºC, and barometric altimeter setting 30.19 inches of mercury. At 1534, the AWOS at TEW reported wind from 010º at 5 kts, gusting 14 kts, visibility 10 miles, scattered clouds at 6,500 ft, temperature 16ºC, dew point 2ºC, and barometric altimeter setting 30.19 inches of mercury. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. He stated the accident flight was his 2nd hour of flight time in the accident airplane. He was "still getting a feel for the airplane, especially how it reacted in different wind conditions." He said more time in the accident airplane would have helped to prevent the accident.

Aircraft

Registration
N757LF
Reported as
North American AT6 (D)
Category
Airplane
Serial number
84991
Built
1943
Airframe hours
9,343
Engine
Pratt and Whitney R-1340-51171, 600 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · June 8, 2015
Departed
RMY · Marshall, MI
Destination
TEW · Mason, MI
Airport
TEW · Mason Jewett Field, runway 10, 4,004 × 75 ft, asphalt

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
64
Injuries
None
Certificates
Airline transport, Commercial
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Last flight review
May 12, 2016
Seat
Front
Flight hours
25,581 total · 89 in this make and model · 22,082 as pilot in command · 6 in the last 90 days · 6 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
40° at 5 knots
Visibility
10 statute miles
Temperature
63 °F, dew point 36 °F
Altimeter
30.19 inHg
Observed at
KTEW

Docket · 3

The files NTSB released with the investigation on September 19, 2019, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.3 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.