# NTSB SEA87LA121: Grumman G-164A, N5285, Viola, ID, June 24, 1987

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 23, 1987, 19:00 local (Jun 24, 1987, 01:00 UTC)
- Place: Viola, ID
- Coordinates: 46.709037, -116.909217 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=46.7090&lon=-116.9092&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report November 8, 1988
- Report: Approved by Office Director
- NTSB case key (mKey): 40645
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA87LA121
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/40645/pdf
- Page: https://openairdocs.org/ntsb/SEA87LA121

## 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
  - eng assembly,blower/impeller/integral supercharger - failure,total (cause)
- Forced landing, descent - emergency
- Main gear collapsed, landing - roll
  - terrain condition - rough/uneven (contributing factor)
  - landing gear,main gear - overload (contributing factor)
- Nose over, landing - roll

## Analysis

DURING AN AERIAL APPLICATIONS MANEUVER A TOTAL LOSS OF POWER OCCURRED DUE TO THE INTERNAL FAILURE OF THE SUPERCHARGER IMPELLER. DURING THE FORCED LANDING THE LEFT MAIN GEAR COLLAPSED CAUSING THE AIRCRAFT TO NOSE OVER INVERTED.

## Aircraft

- Registration: [N5285](https://openairdocs.org/deregistered/N5285-2006-09-12), registration cancelled 2006-09-12, S/N 565, built 1968 (OpenAirDocs)
- Reported make and model: GRUMMAN G-164A
- Registry model: [Grumman G-164A](https://openairdocs.org/model/grumman-g-164a) (registry code 3952704) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R-985 series](https://openairdocs.org/engine/pratt-whitney-r-985-series) (registry code 52008, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 565
- Airframe hours: 6329
- Engines: P&W R-985-AN1 450 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Steve'S Crop Care
- Registered owner: Steve'S Crop Care
- Airworthiness certificate: Special, Restricted (Special)
- Departed: VIOLA, ID
- Airport: Lebold Airstrip

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 38; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 2,500 total, 2,500 in this make and model, 178 in the last 90 days, 10 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 70 °F, dew point 25 °F
- Altimeter: 30.00 inHg

## 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 19870623026429A](https://openairdocs.org/incident/19870623026429A), Jun 23, 1987: Scwzer G164, Viola, ID, Substantial damage. Engine quit. Forced landing. Left gear torn off on impact with ground. Flipped over. Supercharger impeller failed.

## Other investigations on N5285 (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 SEA85LA098](https://openairdocs.org/ntsb/SEA85LA098), Apr 26, 1985: Grumman G-164A (N5285), Kendrick, ID, substantial damage
- [NTSB DEN69F0161](https://openairdocs.org/ntsb/DEN69F0161), Jan 6, 1969: Grumman G-164A (N5285), Snowville, UT, 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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