CEN18LA356

NTSB accident investigation · Air Tractor AT 301 · Partridge, KS · August 29, 2018

Accident · No injuriesLimited investigationFinal report
Date
August 29, 2018, 13:23 local (18:23 UTC)
Place
Partridge, KS
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N3164KAir Tractor AT 301
Defining event
Enroute: Loss of engine power (total)
Weather
Visual (VMC) · Day
Status
Completed · report November 19, 2019
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA Flight Standards
FAA report
20180829012519A
Case key
98187

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 total loss of engine power for reasons that could not be determined based on the available evidence.

Findings · 1

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.

Not determinedNot determined › Not determined · Unknown/Not determinedAir Tractor AT-301: 11 casesAll aircraft: 2,247 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 commercial pilot reported that he had been flying for about 1 hour and was returning to the airport when the engine lost total power while the airplane was about 1,000 ft above ground level (agl). Although the engine momentarily regained power twice, for about 3 seconds each time when he used the manual fuel pump, the airplane continued to lose altitude. He attempted to land on a road but was unable to properly align the airplane's flightpath with the road. The airplane stalled about 20 ft agl, contacted the road, and bounced before coming to rest in an adjacent field, which resulted in substantial damage to the left wing. A postaccident engine examination did not reveal any evidence of preimpact mechanical malfunctions or failures that would have precluded normal operation.

Factual narrative

On August 29, 2018, about 1323 central daylight time, an Air Tractor AT-301 airplane, N3164K, was substantially damaged during a forced landing following a loss of engine power near Partridge, Kansas. The pilot was not injured. The airplane was registered to and operated by Ag Air Services Inc. as a Title 14 Code of Federal Regulations Part 137 aerial application flight. Day visual meteorological conditions prevailed. The flight was not operated on a flight plan. The local flight originated from the Hutchison Regional Airport (HUT) about 1220.The pilot reported that he had been flying for about 1 hour and was returning to the airport when the engine lost power. The airplane was about 1,000 ft above ground level (agl) at the time. He noted that the engine regained power momentarily twice – for about 3 seconds each time – when he used the manual fuel pump. However, the airplane continued to lose altitude and he abandoned further restart attempts to focus on the forced landing. He attempted to land on a road, but he was unable to properly align the airplane's flight path with the remaining altitude. The airplane aerodynamically stalled about 20 ft agl, contacted the road, and bounced before coming to rest in an adjacent agricultural field. The airplane sustained damage to the left wing. The operator recovered the airplane from the accident site. He stated that 29 gallons of fuel was drained from the airplane during recovery. A postrecovery engine examination performed by Federal Aviation Administration inspectors did not reveal any anomalies consistent with a preaccident failure or malfunction. The engine driven fuel pump was removed and tested. It operated normally when operated with an electric drill. The airframe fuel screens were intact and free of debris or sediment. The airplane was not equipped with an electric fuel pump. The only backup fuel pump was the manual pump.

Aircraft

Registration
N3164K
Reported as
Air Tractor AT 301 (No Series)
Category
Airplane
Serial number
301-0535
Built
1984
Airframe hours
6,578.2
Engine
Pratt & Whitney R1340-AN1, 600 horsepower, reciprocating
Damage
Substantial damage
Flight
Aerial application · Part 137
Operator
Ag Air Service Inc.
Registered owner
Phoenix Equipment LLC
Airworthiness certificate
Special, Restricted (Special)
Last inspection
Annual · March 20, 2018 · 200 hours before
Departed
HUT · Hutchinson, KS
Destination
HUT · Hutchinson, KS
Airport
HUT · Hutchinson Regional
Equipment
Stall warning system, Handheld GPS

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
24
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Without waivers/limitations
Last flight review
December 26, 2017
Seat
Single
Restraint
4-point
Flight hours
548 total · 208,215 in this make and model · 512 as pilot in command · 207 in the last 90 days · 105 in the last 30 days · 6 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Variable at 5 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
81 °F, dew point 64 °F
Altimeter
30.09 inHg
Observed at
HUT, 12 nm away

Docket · 4

The files NTSB released with the investigation on April 5, 2019, on NTSB’s docket system: statements, records, photos and specialists’ reports. 4.2 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.