CEN13LA391

NTSB accident investigation · Air Tractor AT-402B · Ipswich, SD · July 2, 2013

Accident · No injuriesLimited investigationFinal report
Date
July 2, 2013, 15:30 local (20:30 UTC)
Place
Ipswich, SD
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N2072DAir Tractor AT-402B
Defining event
Takeoff: Aerodynamic stall/spin
Weather
Visual (VMC) · Day
Status
Completed · report March 13, 2014
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA FSDO
FAA report
20130702013359A
Case key
87382

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 obtain adequate airspeed during the takeoff roll, which resulted in an aerodynamic stall.

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.

Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotAir Tractor AT-402B: 7 casesAll aircraft: 9,295 casesProbable cause
Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Not attained/maintainedAir Tractor AT-402B: 3 casesAll aircraft: 1,681 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

At the beginning of an aerial application run, the pilot rotated the airplane near the end of the runway; the airplane lifted up from the ground, yawed, and then shuddered. The airplane descended, the left wing contacted the ground, and the airplane slid to a stop. The circumstances of the accident are consistent with an aerodynamic stall during takeoff because the pilot failed to obtain adequate speed to climb the airplane.

Factual narrative

On July 2, 2013, about 1530 central daylight time, an Air Tractor AT-402B, N2072D, impacted terrain after takeoff from a private strip near Ipswich, South Dakota. The commercial pilot was not injured. The airplane was substantially damaged. The airplane was registered to and operated by Tri County Ag Service Inc., under the provisions of 14 Code of Federal Regulations Part 137 as an aerial application flight. Visual meteorological conditions prevailed for the flight, which operated without a flight plan. The local flight was originating at the time of the accident. In a telephone interview with the pilot, he reported that the airplane was loaded with 380 gallons of applicant and 170 gallons of fuel prior to departure. He rotated the airplane near the end of the runway and the airplane lifted off. The airplane then twisted or yawed and he felt the airplane shudder before the left wing dropped and the airplane descended. The left wing contacted the ground and the airplane slid to a stop. Examination of the airplane revealed substantial damage to the left wing and fuselage.

Aircraft

Registration
N2072D
Reported as
Air Tractor AT-402B
Category
Airplane
Serial number
402B-1268
Engine
P&W Canada PT6A-34AG, turbo prop
Damage
Substantial damage
Flight
Aerial application · Part 137
Operator
Tri County Ag Service Inc, doing business as Tri-County Ag Service Inc
Registered owner
Tri County Ag Service Inc
Airworthiness certificate
Special, Restricted (Special)
Departed
2SD9 · Ipswich, SD
Destination
2SD9 · Ipswich, SD
Airport
2SD9 · Tc Field, runway 36, 2,500 × 28 ft, asphalt

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
54
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land
Medical
Class 2, With waivers/limitations
Last flight review
November 1, 2012
Seat
Single
Restraint
4-point
Flight hours
16,353 total · 828 in this make and model · 206 in the last 90 days

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
8 statute miles
Lowest ceiling
None
Temperature
84 °F, dew point 46 °F
Altimeter
30.13 inHg
Observed at
KABR, 25 nm away

Docket · 3

The files NTSB released with the investigation on January 22, 2014, on NTSB’s docket system: statements, records, photos and specialists’ reports. 391 KB 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.