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Aviation safety reports, made easier to study

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April 24, 2013 · Air Tractor AT-301 · N23416

Bowling Green, MO

Overview

Report Status
Final with probable cause
Event Type
Accident
Date
April 24, 2013
Injury Outcomes
No injuries (1 uninjured)
Location
Bowling Green, MO
Aircraft
Air Tractor AT-301
Tail Number
N23416
Operator
Air Cover Crop Solutions
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CEN13LA239

Shortly after takeoff, the engine lost power, and the pilot subsequently performed a forced landing to a field 1/4 mile off the departure end of the runway. During the forced landing, the airplane nosed over in the mud. According to the pilot, before takeoff, the engine was washed down, inspected, and then started and run for 15 minutes at idle power. The engine power was then advanced to 31 inches of manifold pressure. All engine checks were normal, and the engine ran smoothly. A postaccident examination of the engine revealed that the rear bearing in the supercharger had failed. Additional damage consistent with the failure of the rear bearing was noted throughout the supercharger and engine. An examination of the airframe, systems, and remaining engine sections revealed no mechanical malfunctions or failures that would have precluded normal operation.

NTSB Probable Cause

The failure of the engine supercharger's rear bearing, which resulted in the loss of engine power.

Full Narrative

On April 24, 2013, about 1610 central daylight time, an Air Tractor Inc., AT-301 airplane, N23416, was substantially damaged during a forced landing near Bowling Green, Missouri. The commercial pilot was not injured. The airplane was registered to, and operated by Air Cover Crop Solutions LLC., under the provisions of 14 Code of Federal Regulations Part 91 without a flight plan. Visual meteorological conditions prevailed. The local flight was originating from the Bowling Green Municipal Airport (H19) at the time of the accident. According to the pilot, the engine was washed down, inspected, and then started and run for 15 minutes at idle power. The engine power was then advanced to 31 inches of manifold pressure; all engine checks were normal, and the engine ran smoothly. The pilot intended to change the engine oil after the flight. Shortly after takeoff, the engine lost power. The pilot performed a forced landing to a field 1/4 mile off of the departure end of the runway. During the forced landing, the airplane nosed over in the mud, and the wings and empennage were substantially damaged. During the examination of the engine, metal fragments were noted in the exhaust tubing. Further examination revealed that the rear bearing on the supercharger assembly had failed and was fragmented. Additional damage was noted to the middle and front bearings, the intermediate gear, the shaft seal, the cover plate, and the impeller. An examination of the airframe, systems, and remaining engine sections revealed no anomalies.

Flight

Event TypeAccident
Event Time16:10 CDT
Nearest AirportBowling Green Municipal Airpor (1nm)
Flight Plan FiledNone
Flight Plan ActivatedNo
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftAir Tractor AT-301
Tail NumberN23416
Aircraft CategoryAir
DamageSubstantial
OperatorAir Cover Crop Solutions
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsPratt & Whitney · R1340-S3H1-6 · Reciprocating · 600
Seats1

People & Injuries

Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 47 · First Class · None

Conditions

ConditionsVMC
LightDaylight
Wind260° @ 10 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point52 / 28 C
Altimeter30.18 inHg
Observation Time22:35

Appendix: Source Data