# NTSB SEA84LA133: Grumman G-164B-450, N6798Q, Pullman, WA, June 14, 1984

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: June 14, 1984, 15:55 local (22:55 UTC)
- Place: Pullman, WA
- Coordinates: 46.720561, -117.180671 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=46.7206&lon=-117.1807&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 39936
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA84LA133
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/39936/pdf
- Page: https://openairdocs.org/ntsb/SEA84LA133

## Sequence of events

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

- Loss of engine power, maneuvering - aerial application
  - reason for occurrence undetermined (cause)
- Forced landing, descent - emergency
- In flight collision with terrain/water, maneuvering - turn to landing area (emergency)
  - terrain condition - rising (contributing factor)
  - clearance - misjudged, pilot in command (cause)
  - diverted attention, pilot in command

## Analysis

AFTER MAKING A SWATH RUN, THE ACFT ENTERED A STEEP TURN WITH AN AIRSPEED OF ABOUT 75 MPH. ACCORDING TO TWO WITNESSES, THE ENG LOST POWER & THEN THE ACFT CRASHED. THE PLT WAS UNABLE TO REMEMBER WHAT HAD HAPPENED FROM THE TIME HE ENTERED THE TURN UNTIL HE WALKED AWAY FROM THE CRASH. AN EXAM OF THE ACCIDENT SITE REVEALED THAT THE ACFT HAD IMPACTED NEAR THE RIDGE OF UPWARD SLOPING TERRAIN, LEFT WING 1ST, THEN CARTWHEELED. AN INSPECTION OF THE ENG WAS PERFORMED, BUT NO REASON FOR THE POWER LOSS WAS FOUND.

## Aircraft

- Registration: [N6798Q](https://openairdocs.org/aircraft/N6798Q), registered now, S/N 310B, built 1977 (OpenAirDocs)
- Reported make and model: GRUMMAN G-164B-450
- 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: [Continental R-975 series](https://openairdocs.org/engine/continental-r-975-series) (registry code 17037, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 310-B
- Airframe hours: 3350
- Engines: P&W R-1340-AN1 600 horsepower reciprocating
- Damage: Destroyed
- Fire: On-Ground
- Flight: Aerial application, Part 137
- Registered owner: Dennis Flying Service
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: 100 hour, February 4, 1984
- Departed: NONE, PULLMAN, WA
- Destination: NONE
- Airport: None

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 57; commercial; airplane ratings: single-engine land, single-engine sea, multi-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 21,000 total, 2,800 in this make and model, 21,000 as pilot in command, 400 in the last 90 days, 6 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 30 statute miles
- Lowest ceiling: none
- Temperature: 75 °F, dew point 64 °F
- Altimeter: 30.00 inHg
- Observed at: PUW, 6 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 19840614026519A](https://openairdocs.org/incident/19840614026519A), Jun 14, 1984: Scwzer G164B, Pullman, WA, Destroyed. Witnesses heard engine stop. Ag aircraft struck rising terrain in a steep bank. No engine defects found.

## Other investigations on N6798Q (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 SEA87LA067](https://openairdocs.org/ntsb/SEA87LA067), Mar 20, 1987: Grumman G164B (N6798Q), Reubens, ID, 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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.