# NTSB MKC85LA125: Snow AT301, N5078S, Marianna, AR, June 8, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 8, 1985, 18:00 local (23:00 UTC)
- Place: Marianna, AR
- Coordinates: 34.76905, -90.760688 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=34.7691&lon=-90.7607&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 33959
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC85LA125
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33959/pdf
- Page: https://openairdocs.org/ntsb/MKC85LA125

## Sequence of events

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

- Loss of engine power, maneuvering - aerial application
  - engine assembly,connecting rod - failure,total (cause)
- Nose over, landing - flare/touchdown
  - terrain condition - soft

## Analysis

AFTER DEPARTING THE AG STRIP THE PLT RPTD A VIBRATING ENGINE WHICH SHOOK VIOLENTLY UNTIL FINALLY QUITTING. THE PLT RESPONDED WITH AN EMERGENCY LANDING ATTEMPT TO A PLOWED BEAN FIELD. THE ACFT IMPACTED THE SOFT TERRAIN AT A HIGH RATE OF SPEED WHERE THE ACFT FLIPPED OVER INVERTED. THEACFT COMMENCED TO BURN AFTER IMPACT, WHICH TOTALLY CONSUMED THE ACFT STRUCTURE. INSPECTION OF THE ACFT ENGINE FOUND A BROKEN NUMBER ONE CYLINDER CONNECTION ROD.

## Aircraft

- Registration: [N5078S](https://openairdocs.org/deregistered/N5078S-2013-03-21), registration cancelled 2013-03-21, S/N 301-0115, built 1978 (OpenAirDocs)
- Reported make and model: SNOW AT301
- 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: AT301-0115
- Airframe hours: 2000
- Engines: P&W R-1340 AN1 600 horsepower reciprocating
- Damage: Substantial damage
- Fire: On-Ground
- Flight: Aerial application, Part 91
- Registered owner: Jackie Frost
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, February 27, 1985
- Departed: 6M7, MARIANNA, AR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 30; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 1,794 total, 878 in this make and model, 1,738 as pilot in command, 117 in the last 90 days, 3 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 110° at 7 knots
- Visibility: 6 statute miles
- Lowest ceiling: none
- Temperature: 86 °F, dew point 68 °F
- Altimeter: 29.00 inHg
- Observed at: MEM, 45 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 19850608026159A](https://openairdocs.org/incident/19850608026159A), Jun 8, 1985: Airtrc AT301, Marianna, AR, Destroyed. During spray maneuver engine began shaking violently and quit. Flipped over on landing. Nr 1 cylinder rod failed.

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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