CEN20CA312

NTSB accident investigation · Air Tractor AT 602 · Tiro, OH · July 27, 2020

Accident · No injuriesClass 4 · Data collectionFinal report
Date
July 27, 2020, 08:10 local (12:10 UTC)
Place
Tiro, OH
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N602FHAir Tractor AT 602
Defining event
Maneuvering-low-alt flying: Low altitude operation/event
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 4 - Basic report with no Prelim publish
NTSB office
Central Region
Parties
FAA Flight Standards
FAA report
20200727011459A
Case key
101683

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 clearance while attempting to fly under power lines during an aerial application pass.

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.

Action: incorrect action performancePersonnel issues › Action/decision · PilotAir Tractor AT-602: 4 casesAll aircraft: 1,386 casesProbable cause
Performance/control parameters: altitudeAircraft › Aircraft oper/perf/capability · Not attained/maintainedAir Tractor AT-602: 11 casesAll aircraft: 1,310 casesProbable cause
Object/animal/substance: wireEnvironmental issues › Physical environment · Contributed to outcomeAir Tractor AT-602: 10 casesAll aircraft: 588 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 was conducting an aerial application flight at the time of the accident. Before spraying, he circled the field and noted high tension power lines. He completed 3 spray runs without incident, passing under the power lines on 2 of those passes. However, on the 4th pass, the pilot "did not maintain a low enough altitude" and the vertical stabilizer struck the lines. The upper portion of the vertical stabilizer and the entire rudder separated from the airframe. He was able to maintain control with a "total loss of rudder control" and executed a forced landing to a harvested wheat field.

Factual narrative

The pilot was conducting an aerial application flight at the time of the accident. Before spraying, he circled the field and noted high tension power lines. He completed 3 spray runs without incident, passing under the power lines on 2 of those passes. However, on the 4th pass, the pilot "did not maintain a low enough altitude" and the vertical stabilizer struck the lines. The upper portion of the vertical stabilizer and the entire rudder separated from the airframe. He was able to maintain control with a "total loss of rudder control" and executed a forced landing to a harvested wheat field.

Aircraft

Registration
N602FH
Reported as
Air Tractor AT 602 (No Series)
Category
Airplane
Serial number
602-1162
Built
2008
Airframe hours
3,108
Engine
Pratt & Whitney Canada PT6A-60AG, 1,050 horsepower, turbo prop
Damage
Substantial damage
Flight
Aerial application · Part 137
Operator
Fisher Spray Service LLC
Registered owner
Fisher Spray Service LLC
Airworthiness certificate
Special, Restricted (Special)
Last inspection
Annual · March 11, 2020 · 151 hours before
Departed
17G · Bucyrus, OH
Destination
17G · Bucyrus, OH
Equipment
Stall warning system, Handheld GPS, Electronic flight bag or handheld device

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
48
Injuries
None
Certificate
Airline transport
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Last flight review
November 17, 2019
Seat
Single
Restraint
4-point
Flight hours
11,997 total · 1,378 in this make and model · 10,310 as pilot in command · 151 in the last 90 days · 75 in the last 30 days · 6 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
230° at 11 knots, gusting 15
Visibility
10 statute miles
Lowest ceiling
None
Temperature
79 °F, dew point 73 °F
Altimeter
29.97 inHg
Observed at
MFD, 14 nm away

Docket · 2

The files NTSB released with the investigation on October 9, 2020, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.4 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.