# NTSB MIA91LA158: Air Tractor AT-301, N8841S, High Springs, FL, June 2, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 2, 1991, 18:25 local (22:25 UTC)
- Place: High Springs, FL
- Coordinates: 29.819112, -82.590179 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=29.8191&lon=-82.5902&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report February 8, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 32881
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA91LA158
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/32881/pdf
- Page: https://openairdocs.org/ntsb/MIA91LA158

## Probable cause

LOSS OF ENGINE POWER DUE TO DISINTEGRATION OF THE IMPELLER CAUSED BY A WORN IMPELLER BEARING.

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Loss of engine power(partial) - mech failure/malf, maneuvering - aerial application
  - eng assembly,blower/impeller/integral supercharger - worn (cause)
- In flight collision with object, descent - emergency
  - object - tree(s)
- In flight collision with terrain/water, descent - uncontrolled
  - terrain condition - ground

## Analysis

A PARTIAL LOSS OF POWER WAS EXPERIENCED AND THE PLT DUMPED THE LOAD OF CHEMICAL. WHILE ATTEMPTING TO LAND IN A FIELD, THE LOSS OF ENG POWER BECAME WORSE. THE ACFT COLLIDED WITH TREES THEN THE GROUND. EXAM OF THE ENG REVEALED THAT THE IMPELLER WAS DISINTEGRATED. ACCORDING TO THE MECHANIC WHO EXAMINED THE ENG, THIS WAS DUE TO A WORN BEARING.

## Aircraft

- Registration: [N8841S](https://openairdocs.org/deregistered/N8841S-2008-08-05), registration cancelled 2008-08-05, S/N 301-0212, built 1979 (OpenAirDocs)
- Reported make and model: Air Tractor AT-301
- Registry model: [Air Tractor AT-301](https://openairdocs.org/model/air-tractor-at-301) (registry code 0390103) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 301-0212
- Engines: P&W R-1340-AN1 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Inmon, Lee
- Registered owner: Inmon, Lee

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 50; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; flight hours: 14,800 total, 4,200 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 270° at 5 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 81 °F, dew point -0 °F

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19910602018769A](https://openairdocs.org/incident/19910602018769A), Jun 2, 1991: Airtrc AT301, High Springs, FL, Substantial damage. Engine lost power on spray run. Dumped load. Struck trees on landing. Engine super charger impeller disintegrated.

## Other investigations on N8841S (2)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB CHI07CA209](https://openairdocs.org/ntsb/CHI07CA209), Jul 15, 2007: Air Tractor AT-301 (N8841S), Lignite, ND, substantial damage. Probable cause: The pilot's poor in-flight planning and failure to maintain control of the airplane when he encountered his own vortex turbulence at a low altitude.
- [NTSB MIA88LA147](https://openairdocs.org/ntsb/MIA88LA147), Apr 14, 1988: Air Tractor AT-301 (N8841S), Hastings, FL, substantial damage

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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