# NTSB SEA91LA136: Schweizer G-164B, N8407K, Wilson Creek, WA, May 27, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: May 27, 1991, 07:40 local (14:40 UTC)
- Place: Wilson Creek, WA
- Coordinates: 47.459815, -119.139038 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.4598&lon=-119.1390&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report February 12, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 41454
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA91LA136
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/41454/pdf
- Page: https://openairdocs.org/ntsb/SEA91LA136

## Probable cause

THE LOSS OF ENGINE POWER IN FLIGHT DUE TO IMPROPER OVERHAUL OF THE CARBURETOR FLOAT ASSEMBLY FULCRUM SCREW, SHUTTING OFF FUEL FLOW TO THE ENGINE.

## Analysis

THE ACFT ENGINE QUIT DURING A LOW LEVEL AERIAL APPLICATION SWATH RUN.  THE PILOT MADE AN EMERG FORCED LANDING AND THE ACFT IMPACTED IRRIGATION EQUIP ON LDG GND ROLL.  POST ACCIDENT EXAM REVEALED CARB FAILURE & FUEL SHUTDOWN TO ENG.

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, maneuvering - aerial application
  - fuel system,carburetor float - disengaged (cause)
  - maintenance,overhaul - improper, other maintenance personnel (cause)
  - fluid,fuel - starvation (cause)
- Forced landing, descent - emergency
- On ground/water collision with object, landing - roll

## Aircraft

- Registration: [N8407K](https://openairdocs.org/deregistered/N8407K-2014-11-19), registration cancelled 2014-11-19, S/N 689 B, built 1982 (OpenAirDocs)
- Reported make and model: SCHWEIZER G-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: 689B
- Engines: P&W R-1340-AN1 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Martin R. Shaw
- Registered owner: Martin R. Shaw
- Last inspection: Annual, February 5, 1991, 120 hours before
- Departed: WA70, WILSON CREEK, WA

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 49; commercial; airplane ratings: single-engine sea, single-engine land, multi-engine land; instrument ratings: helicopter, airplane; medical: class 2, valid medical--no waivers/lim.; flight hours: 14,000 total, 8,000 in this make and model, 13,900 as pilot in command, 120 in the last 90 days, 80 in the last 30 days, 6 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 30 statute miles
- Lowest ceiling: none
- Temperature: 57 °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 19910527017449A](https://openairdocs.org/incident/19910527017449A), May 27, 1991: Scwzer G164B, Wilson Creek, WA, Substantial damage. Engine quit on spray run. Struck irrigation equipment landing. Carburetor failure shut off fuel to engine.

## Other investigations on N8407K (1)

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 SEA93LA168](https://openairdocs.org/ntsb/SEA93LA168), Aug 1, 1993: Grumman 164B (N8407K), Ephrata, WA, destroyed. Probable cause: INADEQUATE VISUAL LOOKOUT BY BOTH PILOTS, RESULTING IN THEIR FAILURE TO SEE-AND-AVOID EACH OTHER'S AIRCRAFT. A FACTOR RELATED TO THE ACCIDENT WAS: FAILURE OF THE GRUMMAN 164B PILOT TO ADEQUATELY…

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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