# NTSB DEN85LA177: Grumman G-164, N6674K, Platte, SD, July 1, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: July 1, 1985, 15:45 local (20:45 UTC)
- Place: Platte, SD
- Coordinates: 43.379215, -98.839599 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.3792&lon=-98.8396&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): 16716
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN85LA177
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16716/pdf
- Page: https://openairdocs.org/ntsb/DEN85LA177

## Sequence of events

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

- In flight collision with object, maneuvering - aerial application
  - clearance - misjudged, pilot in command (cause)
- Airframe/component/system failure/malfunction, maneuvering - aerial application
  - landing gear,main gear - overload
- Main gear collapsed, landing

## Analysis

WHILE THE PLT WAS SPRAYING A FIELD, THE LANDING GEAR OF THE ACFT STRUCK THE CENTER PIVOT OF AN IRRIGATION STRUCTURE. LATER, WHEN THE ACFT WAS LANDED, THE GEAR COLLAPSED.

## Aircraft

- Registration: [N6674K](https://openairdocs.org/aircraft/N6674K), registered now, S/N 16C, built 1978 (OpenAirDocs)
- Reported make and model: GRUMMAN G-164
- Registry model: [Grumman Acft ENG Cor-Schweizer G-164C](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164c) (registry code 3952803) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Airframe hours: 1761
- Engines: WRIGHT R-1820 reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 137
- Registered owner: Duane Sly
- Airworthiness certificate: Special, Restricted (Special)
- Airport: Platte, runway 13, 3,550 ×  ft, grass/turf

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 38; commercial; airplane ratings: multi-engine land, single-engine land; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 6,500 total, 874 in this make and model, 198 in the last 90 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 230° at 6 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 90 °F
- Altimeter: 30.00 inHg
- Observed at: MHE, 35 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 19850701029019A](https://openairdocs.org/incident/19850701029019A), Jul 1, 1985: Scwzer G164C, Platte, SD, Substantial damage. Gear struck center pivot of an irrigation structure during spray run. Upon landing, damaged gear collapsed.

## Other investigations on N6674K (3)

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 WPR18LA128](https://openairdocs.org/ntsb/WPR18LA128), Apr 29, 2018: Grumman Acft ENG Cor-Schweizer G 164C (N6674K), Maxwell, CA, substantial damage. Probable cause: A total loss of engine power due to an uncommanded closing of the fuel shutoff valve, which terminated fuel to the engine. The reason for the fuel shutoff valve’s closure could not be determined…
- [NTSB GAA17CA305](https://openairdocs.org/ntsb/GAA17CA305), May 26, 2017: Grumman Acft ENG Cor-Schweizer G-164 (N6674K), Maxwell, CA, substantial damage. Probable cause: The pilot's failure to visually check the fuel quantity during the preflight inspection and ensure that sufficient fuel was onboard for the flight, which resulted in a total loss of engine power due…
- [NTSB DEN81DTK21](https://openairdocs.org/ntsb/DEN81DTK21), Aug 14, 1981: Grumman G-164C (N6674K), Platte, SD, 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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