CHI08CA246

NTSB accident investigation · Air Tractor AT-802A · Turton, SD · August 10, 2008

Accident · No injuriesData collectionFinal report
Date
August 10, 2008, 06:35 local (11:35 UTC)
Place
Turton, SD
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N9078GAir Tractor AT-802A
Defining event
Enroute-cruise: Loss of engine power (total)
Weather
Visual (VMC) · Dawn
Status
Completed · report September 26, 2008
Report
Approved by Office Director
Case key
68764

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 failure of the starter generator which resulted in the subsequent loss of engine power. Contributing to the accident were the low altitude at which the airplane was operating, the tall grass, and the ditch.

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.

Engine starting: starterAircraft › Aircraft power plant · FailureAir Tractor AT-802A: 1 caseAll aircraft: 2 casesProbable cause
Runway/land/takeoff/taxi surfaceEnvironmental issues › Physical environment · Contributed to outcomeAir Tractor AT-802A: 1 caseAll aircraft: 253 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 reported that while in cruise flight at approximately 500 feet above ground level, the radios began "popping and breaking squelch." He stated that he realized the generator system failed and approximately 30 seconds later, the engine began to lose power. He advanced the throttle and turned back toward the departure airport. The pilot stated the engine then began to vibrate and rapidly lose power. The pilot dumped the chemical load and identified a road on which to land. During the landing, the left wing caught in the tall grass alongside the road, spinning the airplane around and into a ditch. Inspection revealed the starter generator failed which was followed shortly thereafter by the loss of engine power. The pilot reported the starter generator was on fire after the accident.

Factual narrative

On August 10, 2008, at 0635 central daylight time, an Air Tractor AT-802A, N9078G, collided with a ditch during an off airport forced landing in Turton, South Dakota. The pilot was not injured. The airplane received substantial damage. The aerial application flight was operated by Wilbur-Ellis Air LLC under Title 14 Code of Federal Regulations Part 137. Visual meteorological conditions prevailed and no flight plan was filed. The flight originated from Huron, South Dakota, at 0615.

The pilot reported that while in cruise flight at approximately 500 feet above ground level, the radios began "popping and breaking squelch." He stated he realized the generator system failed and approximately 30 seconds later, the engine began to lose power. He advanced the throttle and turned back toward the departure airport. The pilot stated the engine then began to vibrate and rapidly lose power. The pilot dumped the chemical load and identified a road on which to land. During the landing, the left wing caught in the tall grass alongside the road, spinning the airplane around and into a ditch.

The pilot reported the starter generator failed which was followed shortly thereafter by the loss of engine power. He reported the starter generator was on fire after the accident.

Aircraft

Registration
N9078G
Reported as
Air Tractor AT-802A
Category
Airplane
Serial number
802A-0015
Engine
Pratt & Whitney Canada PT6A-65AG, turbo prop
Damage
Substantial damage
Flight
Aerial application · Part 137
Operator
Wilbur-Ellis Air LLC
Registered owner
Krech Greg Trustee
Airworthiness certificate
Special, Restricted (Special)
Departed
HON · Huron, SD
Destination
Turton, SD

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
41
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Flight hours
9,078 total · 856 in this make and model · 8,990 as pilot in command · 622 in the last 90 days · 185 in the last 30 days · 0 in the last 24 hours

Weather

Conditions
Visual (VMC) · Dawn
Wind
120° at 6 knots
Visibility
10 statute miles
Lowest ceiling
10,000 ft broken
Temperature
70 °F, dew point 64 °F
Altimeter
29.98 inHg
Observed at
HON