CEN21LA357

NTSB accident investigation · Air Tractor AT-602 · Mer Rouge, LA · August 4, 2021

Accident · Minor injuriesClass 3 · LimitedFinal report
Date
August 4, 2021, 15:20 local (20:20 UTC)
Place
Mer Rouge, LA
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N455LAAir Tractor AT-602
Defining event
Takeoff: Loss of engine power (total)
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 3
NTSB office
Central Region
Parties
FAA
FAA report
20210804011539A
Case key
103634

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 total loss of engine power due to fuel exhaustion. Contributing to the accident was the pilot and ground personnel’s miscalculation of available fuel.

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.

Fluids: fuelAircraft › Fluids/misc hardware · Not serviced/maintainedAir Tractor AT-602: 8 casesAll aircraft: 1,695 casesProbable cause
Planning/preparation: fuel planningPersonnel issues › Task performance · PilotAir Tractor AT-602: 4 casesAll aircraft: 719 casesProbable cause
Planning/preparation: fuel planningPersonnel issues › Task performance · Ground crewAir Tractor AT-602: 4 casesAll aircraft: 719 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 accident occurred on the third aerial application flight of the day. Ground support personnel stated they loaded the airplane with about 480 gallons of insecticide and fertilizer, and about 60 gallons of Jet A-1 fuel, which increased the total fuel load to about 160 gallons prior to takeoff. Shortly after rotation, the airplane engine lost power. The pilot conducted a forced landing to a field. During the forced landing, the airplane impacted a soybean field and came to rest upright. The airplane sustained substantial damage to the fuselage and wings. Postaccident examination of the airplane’s intact fuel system and the accident site found no evidence of fuel. The investigation revealed that the ground personnel and the pilot thought the airplane contained about 160 gallons of fuel prior to takeoff; however, based on the available evidence, it is likely the airplane did not contain fuel, and the engine lost power due to fuel exhaustion.

Factual narrative

On August 4, 2021, about 1520 central daylight time, an Air Tractor AT-602, N455LA, was substantially damaged when it was involved in an accident near Mer Rouge, Louisiana. The pilot sustained minor injuries. The airplane was operated as a Title 14 Code of Federal Regulations Part 137 aerial application flight. The pilot reported the accident occurred on the third aerial application flight of the day. Ground support personnel loaded the airplane with about 480 gallons of insecticide and fertilizer, and about 60 gallons of Jet A-1 fuel, which increased the total fuel load to about 160 gallons prior to takeoff. Shortly after rotation, the airplane engine lost power. The pilot conducted a forced landing to a field. During the forced landing, the airplane impacted a soybean field and came to rest upright. The airplane sustained substantial damage to the fuselage and wings (see figure 1.) Figure 1. Accident Airplane (Source: law enforcement) According to a Federal Aviation Administration inspector, the airplane’s fuel system was intact, and the wing fuel tanks did not appear to contain any fuel. No evidence of fuel was found at the accident site. In addition, the operator did not have a recordkeeping system of fuel distribution at the refueling location. According to the airplane recovery personnel, the chemical hopper had contained a puncture hole that leaked into one of the fuel tanks. During the recovery process, about 7 to 8 gallons of a fuel/chemical mixture was drained from the fuel tanks. There was no evidence of about 160 gallons of fuel at the accident site or in the airplane fuel tanks.

Aircraft

Registration
N455LA
Reported as
Air Tractor AT-602
Category
Airplane
Serial number
602-1311
Built
2020
Airframe hours
1,200
Engine
Pratt & Whitney PT-6A-65AG, 1,350 horsepower, turbo prop
Damage
Substantial damage
Flight
Aerial application · Part 137
Registered owner
Wilmot Airplane Ventures LLC
Airworthiness certificate
Special, Restricted (Special)
Last inspection
100 hour · July 7, 2021
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
37
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Without waivers/limitations
Seat
Single
Restraint
5-point
Flight hours
10,000 total · 7,500 in this make and model · 1,000 as pilot in command · 350 in the last 90 days · 150 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
60° at 8 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
90 °F, dew point 66 °F
Altimeter
30.02 inHg
Observed at
KMLU, 20 nm away
METAR
KMLU 042053Z 06008KT 10SM CLR 32/19 A3002 RMK AO2 SLP165 T03170194 58011

Docket · 5

The files NTSB released with the investigation on January 4, 2023, on NTSB’s docket system: statements, records, photos and specialists’ reports. 6.1 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.