# NTSB SEA84LA097: Grumman G-164A, N4897, Hermiston, OR, April 28, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: April 28, 1984, 15:30 local (23:30 UTC)
- Place: Hermiston, OR
- Coordinates: 45.850379, -119.209594 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=45.8504&lon=-119.2096&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): 39907
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA84LA097
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/39907/pdf
- Page: https://openairdocs.org/ntsb/SEA84LA097

## Sequence of events

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

- In flight collision with terrain/water, maneuvering - aerial application
  - weather condition - unfavorable wind (contributing factor)
  - terrain condition - ground
  - clearance - not maintained, pilot in command (cause)

## Analysis

DURING A BEGINNING SWATH RUN, THE PLT WAS MAKING A LEFT SKIDDING TURN TO FOLLOW THE EDGE OF A CIRCULAR FIELD. HE STATED THAT THE ACFT ENCOUNTERED A DOWNDRAFT WHICH RAISED THE RIGHT WING. SUBSEQUENTLY, THE LEFT WING CONTACTED THE GROUND & THE ACFT CRASHED.

## Aircraft

- Registration: [N4897](https://openairdocs.org/deregistered/N4897-1993-05-28), registration cancelled 1993-05-28, S/N 1094 (OpenAirDocs)
- Reported make and model: GRUMMAN G-164A
- Registry model: [Grumman Acft ENG Cor-Schweizer G-164A](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164a) (registry code 3952801) (OpenAirDocs)
- Category: Airplane
- Serial number: 1094
- Airframe hours: 3769
- Engines: P&W R-985-AN1 450 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Registered owner: West Line Service
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, September 19, 1983
- Departed: 5S7, HERMISTON, OR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 45; commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 9,177 total, 5,000 in this make and model, 9,700 as pilot in command, 150 in the last 90 days, 6 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 210° at 11 knots
- Visibility: 30 statute miles
- Lowest ceiling: none
- Temperature: 57 °F, dew point 37 °F
- Altimeter: 30.00 inHg
- Observed at: AWL, 55 nm away

## Other investigations on N4897 (2)

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 SEA82DA058](https://openairdocs.org/ntsb/SEA82DA058), Apr 25, 1982: Grumman G-164A (N4897), S. Of Echo, OR, substantial damage
- [NTSB LAX74DUJ16](https://openairdocs.org/ntsb/LAX74DUJ16), Aug 27, 1973: Grumman G-164A (N4897), Arlington, AZ, 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.

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