# NTSB MIA87LA209: Air Tractor AT-301, N7310N, Swiftown, MS, July 18, 1987

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: July 18, 1987, 11:30 local (16:30 UTC)
- Place: Swiftown, MS
- Location: 33.3057° N, 90.4251° W: Placed by OpenAirDocs: center of Swiftown, MS, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=33.3057&lon=-90.4251&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report May 27, 1988
- Report: Approved by Office Director
- NTSB case key (mKey): 31943
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA87LA209
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/31943/pdf
- Page: https://openairdocs.org/ntsb/MIA87LA209

## Sequence of events

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

- Airframe/component/system failure/malfunction, maneuvering - aerial application
  - engine assembly,crankshaft - failure,total (cause)
- Forced landing, descent - emergency
- Nose over, landing - roll

## Analysis

WHILE SPRAYING COTTON, SEVERE VIBRATION WAS FELT THROUGHOUT THE ACFT & THE PLT ELECTED A FORCED LDG. DURING THE FLARE, THE THROTTLE WAS ADVANCED TO RAISE THE NOSE, & THE PLT DISCOVERED THE ENG HAD TOTALLY FAILED. THE ACFT FLIPPED INVERTED ON TOUCH DOWN. AN EXAM OF THE ENG REVEALED THAT THE CRANKSHAFT ASSY, P/N 270458, HAD FAILED AT THE THROUGH BOLT LOCATION OF THE FRONT CRANKSHAFT CHEEK.

## Aircraft

- Registration: [N7310N](https://openairdocs.org/deregistered/N7310N-2022-05-03), registration cancelled 2022-05-03, S/N 301-0649 (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: 3010649
- Airframe hours: 459
- Engines: P&W R-1340-AN1 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Pugh City Flying Ser.,Inc.
- Registered owner: Pugh City Flying Service Inc.
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, May 1, 1987

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 55; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 14,000 total, 460 in this make and model, 13,943 as pilot in command, 150 in the last 90 days, 12 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 160° at 4 knots
- Visibility: 6 statute miles
- Lowest ceiling: none
- Temperature: 90 °F, dew point 66 °F
- Altimeter: 30.00 inHg
- Observed at: GWO, 15 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 19870718035409A](https://openairdocs.org/incident/19870718035409A), Jul 18, 1987: Airtrc AT301, Swiftown, MS, Substantial damage. The aircraft force landed in a cotton field due to engine vibration during a swath run. Crankshaft had failed.

## Other investigations on N7310N (1)

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 ERA13CA163](https://openairdocs.org/ntsb/ERA13CA163), Feb 24, 2013: Air Tractor AT-301 (N7310N), Greenbrier, AL, substantial damage. Probable cause: The pilot’s failure to maintain adequate clearance from trees.

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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