# NTSB DEN84LA237: Grumman G-164, N751Y, Wessington, SD, July 25, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: July 25, 1984, 18:45 local (23:45 UTC)
- Place: Wessington, SD
- Coordinates: 44.45055, -98.689315 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=44.4505&lon=-98.6893&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 16444
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN84LA237
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16444/pdf
- Page: https://openairdocs.org/ntsb/DEN84LA237

## Sequence of events

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

- In flight encounter with weather, takeoff - initial climb
  - weather evaluation - improper, pilot in command (cause)
  - weather condition - clouds (contributing factor)
  - weather condition - unfavorable wind (contributing factor)
  - weather condition - turbulence (contributing factor)
  - weather condition - gusts (contributing factor)
  - weather condition - downdraft (contributing factor)
- Loss of control - in flight, takeoff
  - proper climb rate - not possible
  - descent - uncontrolled
  - load jettison - not performed, pilot in command (contributing factor)
- Forced landing, descent - emergency
- Nose down, landing - roll
  - terrain condition - crop (cause)

## Analysis

PLT STATED THAT DURING LOADING FOR AERIAL APPLICATION, HE FAILED TO NOTE APPROACHING ROLL CLOUD WHICH USUALLY SIGNIFIES LOCALIZED TURBULENCE AND STRONG, GUSTING WINDS. ON TAKEOFF ROLL, WIND SHIFT NOTED AND AT 100 FT ALTITUDE, HEAVY TURBULENCE WAS ENCOUNTERED. THE LIQUID LOAD BEGAN TO SLOSH AND THE ACFT LOST ALTITUDE, EVENTUALLY SETTLING INTO A CORN FIELD. NO ATTEMPT TO JETTISON LOAD WAS MADE.

## 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: 2886
- Engines: JACOBS R755A2M1 300 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Leland Cain
- Registered owner: Jmz Aviation Inc.
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, August 13, 1983, 150 hours before
- Departed: WESSINGTON, SD

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 45; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 1,846 total, 360 in this make and model, 100 in the last 90 days, 120 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 45° at 15 knots, gusting 15
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 72 °F, dew point -0 °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 19840725034959A](https://openairdocs.org/incident/19840725034959A), Jul 25, 1984: Scwzer G164, Wessington, SD, Substantial damage. Forced into contact with tall corn during a spray run by sudden turbulence from a squall line roll cloud passage.

## 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 DEN86LA162](https://openairdocs.org/ntsb/DEN86LA162), Jun 12, 1986: 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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