# NTSB SEA91LA178: Grumman G-164-B, N6657Q, Pullman, WA, July 18, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: July 17, 1991, 20:00 local (Jul 18, 1991, 03:00 UTC)
- Place: Pullman, WA
- Coordinates: 46.71907, -117.180923 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=46.7191&lon=-117.1809&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report February 8, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 41488
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA91LA178
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/41488/pdf
- Page: https://openairdocs.org/ntsb/SEA91LA178

## Probable cause

THE PILOT'S FAILURE TO MAINTAIN RUNWAY ALIGNMENT.  FACTORS INCLUDE HIGH VEGETATION GROWING CLOSE TO THE RUNWAY.

## Sequence of events

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

- On ground/water collision with object, takeoff - roll/run
  - proper alignment - not maintained, pilot in command (cause)
  - terrain condition - high vegetation (contributing factor)

## Analysis

THE PILOT OF THE GRUMMAN G-164B FAILED TO KEEP THE AIRCRAFT ALIGNED WITH THE CENTER OF THE RUNWAY, DURING THE TAKEOFF ROLL, AND HOOKED THE SPRAY BOOM ON SOME TALL WHEAT, GROWING BESIDE THE AIRSTRIP.  THE AIRCRAFT WAS PULLED INTO A HARD RIGHT DECELERATION.

## Aircraft

- Registration: [N6657Q](https://openairdocs.org/deregistered/N6657Q-1997-01-09), registration cancelled 1997-01-09, S/N 183B (OpenAirDocs)
- Reported make and model: GRUMMAN G-164-B
- 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: 183B
- Engines: P&W R1340 AN-2 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Dennis Flying Service Inc.
- Registered owner: Dennis Flying Service Inc.
- Airport: None, runway 23, 3,300 × 60 ft, gravel

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 43; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; flight hours: 8,800 total, 5,000 in this make and model, 8,700 as pilot in command, 400 in the last 90 days, 150 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Not reported
- Lowest ceiling: none
- Temperature: -0 °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 19910717027959A](https://openairdocs.org/incident/19910717027959A), Jul 17, 1991: Scwzer G164B, Pullman, WA, Substantial damage. Caught spray boom on tall wheat on edge of strip on takeoff. Veered into wheat.

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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