# NTSB DEN86LA162: Grumman G-164, N751Y, Wessington, SD, June 12, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 11, 1986, 19:35 local (Jun 12, 1986, 00:35 UTC)
- Place: Wessington, SD
- Coordinates: 44.450126, -98.689163 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=44.4501&lon=-98.6892&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): 16982
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN86LA162
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16982/pdf
- Page: https://openairdocs.org/ntsb/DEN86LA162

## Sequence of events

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

- In flight encounter with weather, maneuvering - aerial application
  - weather condition - downdraft (cause)
  - proper altitude - not maintained, pilot in command (cause)
- In flight collision with terrain/water, maneuvering - aerial application
  - terrain condition - rough/uneven

## Analysis

ACCORDING TO THE PLT, DURING MANEUVERING ON A SWATH RUN, THE ACFT HE WAS PILOTING ENCOUNTERED A DOWNDRAFT, FORCING THE ACFT DOWN UNTIL CONTACT WITH THE GROUND.

## Aircraft

- Registration: [N751Y](https://openairdocs.org/aircraft/N751Y), registered now, S/N 328, built 1965 (OpenAirDocs)
- Reported make and model: GRUMMAN G-164
- Registry model: [Grumman G-164](https://openairdocs.org/model/grumman-g-164) (registry code 3952702) (OpenAirDocs)
- Registry engine: [Jacobs R755A series](https://openairdocs.org/engine/jacobs-r755a-series) (registry code 35006, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 328
- Airframe hours: 3133
- Engines: JACOBS R-755-A2 300 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Jmc Aviation, Inc.
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, May 5, 1986, 100 hours before
- Departed: WESSINGTON, SD

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 44; flight instructor, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 3,846 total, 692 in this make and model, 3,835 as pilot in command, 135 in the last 90 days, 3 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 340° at 8 knots
- Visibility: 7 statute miles
- Lowest ceiling: none
- Temperature: 70 °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 19860611025269A](https://openairdocs.org/incident/19860611025269A), Jun 11, 1986: Scwzer G164, Wessington, SD, Substantial damage. Encountered a strong downdraft while maneuvering for a spray run. Impacted the ground.

## Other investigations on N751Y (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 DEN84LA237](https://openairdocs.org/ntsb/DEN84LA237), Jul 25, 1984: Grumman G-164 (N751Y), Wessington, SD, substantial damage
- [NTSB MKC71DCA09](https://openairdocs.org/ntsb/MKC71DCA09), Aug 14, 1970: Grumman G-164 (N751Y), Williamsville, MO, 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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