# NTSB SEA83LA167: Grumman G-164A, N6664Q, Klamath Falls, OR, August 5, 1983

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: August 5, 1983, 12:15 local (19:15 UTC)
- Place: Klamath Falls, OR
- Coordinates: 44.950786, -120.649444 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=44.9508&lon=-120.6494&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): 39746
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA83LA167
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/39746/pdf
- Page: https://openairdocs.org/ntsb/SEA83LA167

## Sequence of events

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

- Dragged wing,rotor,pod,float or tail/skid, maneuvering - aerial application
  - window,flight compartment window/windshield - dirty(foggy) (contributing factor)
  - visual lookout - not possible, pilot in command (cause)
  - in-flight planning/decision - poor, pilot in command (cause)
- In flight collision with terrain/water, maneuvering - aerial application
  - terrain condition - water,glassy (contributing factor)

## Analysis

THE ACFT DRAGGED A WING IN A LAKE AND CARTWHEELED DURING AN AERIAL APPLICATION MANEUVER. THE PILOT SAID HE HAD TURNED AWAY FROM THE FIELD HE WAS SPRAYING TO REMOVE THE BUGS FROM HIS WINDSHIELD. THE ACFTS WING STRUCK A LAKE SURFACE IN THE TURN, CARTWHEELED AND CAME TO REST UNDER 5 FT OF WATER. THE PILOT STATED THE BUGS WERE SO THICK THAT HE WAS HAVING DIFFICULTY MAINTAINING VISUAL REFERENCE.

## Aircraft

- Registration: [N6664Q](https://openairdocs.org/deregistered/N6664Q-1984-12-21), registration cancelled 1984-12-21, S/N 1698 (OpenAirDocs)
- Reported make and model: GRUMMAN G-164A
- Registry model: [Grumman Acft ENG Cor-Schweizer G-164B](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164b) (registry code 3952802) (OpenAirDocs)
- Category: Airplane
- Serial number: 1698
- Airframe hours: 2551
- Engines: P&W R-1340-AN1 600 horsepower reciprocating
- Damage: Destroyed
- Flight: Aerial application, Part 137
- Registered owner: Robert Yancey
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, February 8, 1983
- Departed: LMT, KLAMATH, OR
- Airport: NONE

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 28; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--no waivers/lim.; seat: front; flight hours: 3,190 total, 1,050 in this make and model, 3,130 as pilot in command, 120 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 30 statute miles
- Lowest ceiling: 12,000 ft broken
- Temperature: 81 °F, dew point 39 °F
- Altimeter: 30.00 inHg
- Observed at: LMT1, 12 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 19830805042389A](https://openairdocs.org/incident/19830805042389A), Aug 5, 1983: Scwzer G164A, Klamath Falls, OR, Destroyed. During low level flight, pilot attempted to clean windshield and wing hit water causing aircraft to cartwheel.

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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