LAX93LA290

NTSB accident investigation · Ayres S2R-T34 · Buckeye, AZ · July 15, 1993

Accident · Minor injuriesLimited investigationFinal report
Date
July 15, 1993, 05:15 local (12:15 UTC)
Place
Buckeye, AZ
Injuries
1 minor
Damage
Destroyed
Phase of flight
Maneuvering
Aircraft
N40203Ayres S2R-T34
Weather
Visual (VMC) · Dawn
Status
Completed · report June 30, 1994
Report
Approved by Office Director
FAA report
19930715023729A
Case key
28427

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 visually detect and avoid a power line. A factor in the accident was the twilight light condition.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

In flight collision with objectManeuvering - aerial application
Light condition - dawnFactor
Object - wire,transmission
Visual lookout - restrictedPilot in commandCause
In flight collision with terrain/waterDescent - uncontrolled

Analysis

The pilot said that after takeoff from an adjacent airstrip he over flew the fields to be sprayed checking for obstacles, then descended for the first swath run. At the end of the second field, the aircraft collided with a power line that the pilot said he did not see during the over flight. The pilot reported that the aircraft then went out of control and collided with the ground. Utilizing a Safety Board computer program, the position of the sun was computed for the date, location and time of the accident. The sun was found to be 3.4 degrees below the horizon on a magnetic azimuth of 048.9 degrees. The accident occurred during the hours of civil twilight.

Factual narrative

On July 15, 1993, at 0515 Mountain standard time, an Ayers Corporation S2R-T34, N40203, collided with power lines while engaged in aerial application maneuvers near Buckeye, Arizona. The aircraft was operated by Pierce Aviation of Buckeye, Arizona, under the provisions of 14 CFR Part 137 of the Federal Aviation Regulations. Visual meteorological conditions prevailed at the time and no flight plan was filed. The aircraft was destroyed in the obstacle and ground collision sequence. The certificated commercial pilot sustained minor injuries. The flight originated from a dirt airstrip near the fields to be sprayed on the day of the mishap at about 0510 hours as a local aerial application flight.

The pilot said that after takeoff from the airstrip he over flew the fields to be sprayed checking for obstacles, then descended for the first swath run. At the end of the second field, the aircraft collided with a power line that the pilot said he did not see during the over flight. The pilot reported that the aircraft then went out of control and collided with the ground.

Utilizing a Safety Board computer program, the position of the sun was computed for the date, location and time of the accident. The sun was found to be 3.4 degrees below the horizon on a magnetic azimuth of 048.9 degrees. The accident occurred during the hours of civil twilight.

Aircraft

Registration
N40203
Reported as
Ayres S2R-T34
Category
Airplane
Serial number
T34-020
Airframe hours
6,554
Engine
P&W PT6-34AG, 750 horsepower, turbo prop
Damage
Destroyed
Flight
Aerial application · Part 137
Operator
Pierce Aviation
Registered owner
Ag Aviation
Airworthiness certificate
Special, Restricted (Special)
Last inspection
Annual · April 1, 1993 · 55 hours before

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
44
Certificates
Commercial, Flight instructor
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Seat
Center
Flight hours
10,144 total · 250 in this make and model · 10,031 as pilot in command · 156 in the last 90 days · 39 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Dawn
Wind
240° at 4 knots
Visibility
20 statute miles
Lowest ceiling
None
Temperature
79 °F
Altimeter
29.00 inHg

FAA reports on this event · 1

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