MIA08CA137

NTSB accident investigation · Air Tractor AT-402B · Muscle Shoals, AL · June 12, 2008

Accident · No injuriesData collectionFinal report
Date
June 12, 2008, 15:45 local (20:45 UTC)
Place
Muscle Shoals, AL
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N402BTAir Tractor AT-402B
Defining event
Maneuvering-low-alt flying: Low altitude operation/event
Weather
Visual (VMC) · Day
Status
Completed · report August 28, 2008
Report
Approved by Office Director
Parties
FAA/FSDO
FAA report
20080612839389A
Case key
68217

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 clearance from utility wires during low altitude maneuvers.

Findings · 2

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.

Object/animal/substance: wireEnvironmental issues › Physical environment · Not specifiedAir Tractor AT-402B: 4 casesAll aircraft: 588 cases
Performance/control parameters: altitudeAircraft › Aircraft oper/perf/capability · Not attained/maintainedAir Tractor AT-402B: 7 casesAll aircraft: 1,310 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 of an Air Tractor AT-402B stated that he was making east and west passes above a cornfield, maneuvering under power lines at one end. On his last pass, the vertical stabilizer contacted a power line, shearing the upper section of the stabilizer and the entire rudder. The pilot was able to land the airplane at a nearby airport without further incident. The pilot further stated that there were no mechanical failures or malfunctions to the airplane or any of its systems prior to the accident.

Factual narrative

The pilot of an Air Tractor AT-402B stated he was making east and west passes above a cornfield, maneuvering under power lines at one end. On his last pass, the vertical stabilizer contacted a power line, shearing the upper section of the stabilizer and the entire rudder. The pilot was able to land the airplane at a nearby airport without further incident. The pilot further stated there were no mechanical failures or malfunctions to the airplane or any of its systems prior to the accident.

Aircraft

Registration
N402BT
Reported as
Air Tractor AT-402B
Category
Airplane
Serial number
402B-1166
Engine
Pratt & Whitney PT6A, 680 horsepower, turbo prop
Damage
Substantial damage
Flight
Aerial application · Part 137
Registered owner
Buster Thorton
Airworthiness certificate
Special, Restricted (Special)
Departed
NONE · Rogersville, AL
Destination
NONE
Airport
MSL · Northwest Alabama Regional

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
57
Injuries
None
Certificates
Private, Flight instructor, Commercial
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Last flight review
October 1, 2006
Seat
Center
Flight hours
17,000 total · 525 in this make and model · 16,900 as pilot in command · 200 in the last 90 days · 40 in the last 30 days · 7 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
150° at 9 knots
Visibility
8 statute miles
Lowest ceiling
4,200 ft broken
Temperature
91 °F, dew point 68 °F
Altimeter
30.04 inHg
Observed at
MSL

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.