# NTSB SEA85LA146: Grumman 164B, N6762K, Twin Falls, ID, June 22, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 21, 1985, 19:30 local (Jun 22, 1985, 01:30 UTC)
- Place: Twin Falls, ID
- Coordinates: 42.409061, -114.589096 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=42.4091&lon=-114.5891&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): 40183
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA85LA146
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/40183/pdf
- Page: https://openairdocs.org/ntsb/SEA85LA146

## Sequence of events

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

- Loss of engine power, maneuvering - aerial application
  - engine assembly,cylinder - cracked (cause)
- Main gear collapsed, maneuvering
- Nose over, landing - flare/touchdown

## Analysis

A PARTIAL LOSS OF POWER OCCURRED DURING AERIAL APPLICATION DUE TO A CRACK AROUND ONE OF THE CYLINDERS. WHILE THE PLT WAS ATTEMPTING TO DUMP CHEMICALS, THE ACFT SETTLED ONTO THE GROUND TEARING OFF THE RT MAIN GEAR. THE PLT THEN FLEW ON TO TWIN FALLS TO LAND. THE ACFT FLIPPED INVERTED DURING THE LANDING.

## Aircraft

- Registration: [N6762K](https://openairdocs.org/deregistered/N6762K-2003-12-02), registration cancelled 2003-12-02, S/N 456B, built 1978 (OpenAirDocs)
- Reported make and model: GRUMMAN 164B
- Registry model: [Grumman Acft ENG Cor-Schweizer G-164B](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164b) (registry code 3952802) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 456B
- Engines: P&W R-1340-AN1 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Registered owner: Ken Spray, Inc.
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: 100 hour, May 13, 1985, 96 hours before
- Departed: TWF, TWIN FALLS, ID
- Airport: TWF, Twin Falls, runway 12, 3,207 × 100 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 56; commercial; airplane ratings: single-engine land, multi-engine land, single-engine sea; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 11,850 total, 4,000 in this make and model, 11,850 as pilot in command, 170 in the last 90 days, 12 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 70 °F, dew point 28 °F
- Observed at: 1

## 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 19850622027149A](https://openairdocs.org/incident/19850622027149A), Jun 22, 1985: Scwzer G164B, Twin Falls, ID, Substantial damage. Loss of power, dumped load, right main gear struck ground and broke off. Flew to airport, flipped over on landing.

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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