# NTSB MIA92LA160: Air Tractor AT-301, N3165A, Redwood, MS, August 7, 1992

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: August 7, 1992, 14:00 local (19:00 UTC)
- Place: Redwood, MS
- Coordinates: 32.499885, -90.789039 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=32.4999&lon=-90.7890&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report September 14, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 33118
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA92LA160
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33118/pdf
- Page: https://openairdocs.org/ntsb/MIA92LA160

## Probable cause

IMPROPER MAINTENANCE OF THE AIRPLANE BY AN UNKNOWN PERSON.

## 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
  - engine assembly,valve,exhaust - failure,total (contributing factor)
  - maintenance - improper, other person (cause)
- Forced landing, descent - emergency
- Nose over, landing - roll
  - terrain condition - soft

## Analysis

THE AGRICULTURAL PILOT REPORTED THAT THE ENGINE WOULD NOT DEVELOP POWER AND BEGAN TO RUN ROUGH. HE ATTEMPTED A FORCED LANDING TO A SOFT FIELD AND THE LANDING GEAR AND TAIL EMPENAGE WERE DAMAGED. EXAMINATION OF THE ENGINE REVEALED THE NO. 3 CYLINDER EXHAUST HOUSING HAD FAILED IN FATIGUE THROUGH THE PRESS FIT BUSHING IN THE LUG BORE.

## Aircraft

- Registration: [N3165A](https://openairdocs.org/aircraft/N3165A), registered now, S/N 301-0544, built 1984 (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: 301-0544
- Airframe hours: 3544
- Engines: P&W R-1340 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: James W. Smith
- Registered owner: James W. Smith
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, January 2, 1900, 143 hours before

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 52; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 9,658 total, 4,000 in this make and model, 119 in the last 90 days, 90 in the last 30 days, 10 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 210° at 4 knots
- Visibility: 6 statute miles
- Lowest ceiling: none
- Temperature: 93 °F, dew point 73 °F
- Altimeter: 30.00 inHg
- Observed at: JAN, 22 nm away

## 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 19920807029779A](https://openairdocs.org/incident/19920807029779A), Aug 7, 1992: Airtrc AT301, Redwood, MS, Substantial damage. Engine lost power on spray run. Flipped over on forced landing. NR3 cylinder and exhaust valve housing cracked.

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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