GAA18CA447

NTSB accident investigation · Air Tractor AT502 · Iowa, LA · July 26, 2018

Accident · No injuriesData collectionFinal report
Date
July 26, 2018, 11:30 local (16:30 UTC)
Place
Iowa, LA
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N254LAAir Tractor AT502
Defining event
Landing-landing roll: Runway excursion
Weather
Visual (VMC) · Day
Status
Completed · report June 5, 2019
Report
Approved by Office Director
NTSB office
General Aviation Accidents
Parties
FAA
FAA report
20180726018069A
Case key
97905

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

Probable cause

The pilot's failure to maintain directional control during the landing roll.

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 · PilotAir Tractor AT-502A: 4 casesAll aircraft: 9,295 casesProbable cause
Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedAir Tractor AT-502A: 2 casesAll aircraft: 3,958 casesProbable cause
Object/animal/substanceEnvironmental issues › Physical environment · Contributed to outcomeAir Tractor AT-502A: 1 caseAll aircraft: 224 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

According to the pilot in the tailwheel-equipped, restricted-category airplane, he had performed an agricultural flight and was landing to take on another load. He made a three-point landing with full flaps and closed the throttle. He stated that, during the landing roll, the airplane "turned violently to the right and got very light on the gear." The airplane’s nose had turned 45° right of the runway centerline, so he applied left brake and left rudder and then he added power. As the power increased, the airplane rolled left. The left wing struck the ground, and the pilot pulled the throttle to idle and then he applied reverse thrust and full brakes. However, the airplane exited the runway and collided with a drainage culvert. The airplane sustained substantial damage to the left wing spar and aileron. The pilot reported that, about the time of the accident, the wind was light and variable, but dust devils were present. Additionally, he reported that the accident could have been prevented by landing at a higher airspeed to keep airflow over the rudder and by minimizing the engine thrust. The pilot reported that there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Factual narrative

According to the pilot in the tailwheel-equipped, restricted category airplane, he had performed an agricultural flight and was landing to take on another load. He made a three-point landing with full flaps and closed the throttle. During the landing roll, the airplane "turned violently to the right and got very light on the gear." The nose of the airplane had turned 45° to the right of the runway centerline, so he applied left brake and left rudder, and then he added power. As the power increased, and the airplane rolled to the left. He reported that the left wing struck the ground and he pulled the throttle to idle, and then he applied reverse thrust and full brakes. However, the airplane exited the runway and collided with a drainage culvert. The airplane sustained substantial damage to the left wing spar and aileron. The pilot reported that about the time of the accident the wind was light and variable, but dust devils were present. Additionally, he reported that the accident could have been prevented by landing at a higher airspeed to keep air flow over the rudder, and by minimizing the engine thrust. The pilot reported that there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Aircraft

Registration
N254LA
Reported as
Air Tractor AT502 (A)
Category
Airplane
Serial number
502A-3054
Built
2016
Airframe hours
965
Engine
Pratt & Whitney PT6A-140AG, 867 horsepower, turbo shaft
Damage
Substantial damage
Flight
Aerial application · Part 137
Operator
Obrien's Flying Service Inc
Registered owner
Obrien's Flying Service Inc
Airworthiness certificate
Special, Restricted (Special)
Last inspection
Annual · February 20, 2018
Departed
LA71 · Iowa, LA
Destination
LA71 · Iowa, LA
Airport
LA71 · O'Brien Flying Service, runway 03, 3,800 × 100 ft, grass/turf
Equipment
None

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
53
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Last flight review
April 20, 2018
Seat
Single
Restraint
5-point
Flight hours
21,639 total · 965 in this make and model · 21,502 as pilot in command · 310 in the last 90 days · 105 in the last 30 days · 6 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
90 °F, dew point 68 °F
Altimeter
30.01 inHg
Observed at
KCWF, 7 nm away

Docket · 2

The files NTSB released with the investigation on March 22, 2019, on NTSB’s docket system: statements, records, photos and specialists’ reports. 3.7 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 N254LA · 1

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