# NTSB MKC84LA250: Grumman G-164A, N7693, Swifton, AR, August 14, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: August 14, 1984, 10:30 local (15:30 UTC)
- Place: Swifton, AR
- Coordinates: 35.81919, -91.119552 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=35.8192&lon=-91.1196&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): 33772
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC84LA250
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33772/pdf
- Page: https://openairdocs.org/ntsb/MKC84LA250

## 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,cylinder - failure,total (cause)
- Forced landing, descent - emergency
- Nose over, landing - roll
  - terrain condition - soft (contributing factor)

## Analysis

DURING A SWATH RUN THE #9 CYLINDER ON THE RADIAL ENGINE SEPARATED. A FORCED LANDING WAS MADE DURING WHICH THE ACFT LANDED IN A LEVEE AND NOSED OVER.

## Aircraft

- Registration: [N7693](https://openairdocs.org/aircraft/N7693), registered now, S/N 985, built 1972 (OpenAirDocs)
- Reported make and model: GRUMMAN G-164A
- Registry model: [Grumman Acft ENG Cor-Schweizer G-164A](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164a) (registry code 3952801) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 985
- Airframe hours: 3100
- Engines: P&W R-1340 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Registered owner: Production Farms, Inc.
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, February 15, 1984
- Departed: SWIFTON, AR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; flight instructor, airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 3,000 total

## Weather

- Conditions: Visual (VMC), Day
- Wind: 80° at 10 knots
- Visibility: 4 statute miles
- Lowest ceiling: 10,000 ft overcast
- Temperature: 84 °F, dew point 72 °F
- Altimeter: 30.00 inHg
- Observed at: JBR, 30 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 19840814040709A](https://openairdocs.org/incident/19840814040709A), Aug 14, 1984: Scwzer G164A, Swifton, AR, Substantial damage. #9 Cylinder failed during a swath run. Ag aircraft overturned during forced landing in a rice field.

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.