# NTSB DEN84LA224: Grumman G-164A, N6589, Richey, MT, July 15, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: July 15, 1984, 11:00 local (17:00 UTC)
- Place: Richey, MT
- Coordinates: 47.7107, -105.029365 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.7107&lon=-105.0294&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 16433
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN84LA224
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16433/pdf
- Page: https://openairdocs.org/ntsb/DEN84LA224

## Sequence of events

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

- Airframe/component/system failure/malfunction, cruise
  - propeller system/accessories,blade - previous damage
  - maintenance,major repair - performed, other maintenance personnel
  - propeller system/accessories,blade - failure,total (cause)
  - engine assembly - vibration
  - engine assembly,mount - overload
- Forced landing, descent - emergency
- On ground/water encounter with terrain/water, landing
  - terrain condition - mountainous/hilly (contributing factor)
  - terrain condition - dirt bank/rising embankment (contributing factor)

## Analysis

THE PLT HAD FINISHED SPRAYING & WAS PROCEEDING TO THE GLENDIVE ARPT. HE SAID THAT ENG OR PROP BEGAN A SUDDEN SEVERE VIBRATION WHICH REQUIRED THE ENG TO BE SHUT DOWN. AN EMEGENCY LANDING WAS MADE. THE PLT STATED THAT THE LEFT WING IMPACTED A HILL WHICH SPUN THE ACFT TO THE LEFT. SUBSEQUENTLY, THE RIGHT MAIN GEAR, TAILWHEEL & THE UPPER & LOWER RIGHT WINGS FAILED. A POST IMPACT FIRE DESTROYED THE ACFT. AN EXAM REVEALED THAT THE OUTER 13 INCHES OF 1 PROP BLADE, P/N 6101A-13, HAD FAILED. ALSO, THE ENG MOUNTING & SEVERAL MOUNTS WERE FOUND BROKEN. RECORDS INDICATED THE HAMILTON STANDARD (PROP HUB 2-D-30-237) HAD BEEN OVERHAULED & TWISTED BLADES HAD BEEN STRAIGHTENED IN 1977. TOTAL TIME ON THE PROP SINCE OVERHAUL WAS 1168 HRS.

## Aircraft

- Registration: [N6589](https://openairdocs.org/deregistered/N6589-2013-04-30), registration cancelled 2013-04-30, S/N 730, built 1970 (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 R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 730
- Airframe hours: 2732
- Engines: P&W R-985 450 horsepower reciprocating
- Damage: Destroyed
- Fire: On-Ground
- Flight: Aerial application, Part 137
- Registered owner: Raymond Kinney
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: 100 hour, May 29, 1984, 60 hours before
- Departed: RICHEY, MT

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 36; commercial; airplane ratings: multi-engine land; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 6,420 total, 400 in this make and model, 6,075 as pilot in command, 205 in the last 90 days, 12 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 81 °F
- Altimeter: 29.00 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 19840715036649A](https://openairdocs.org/incident/19840715036649A), Jul 15, 1984: Scwzer G164A, Richey, MT, Destroyed. Severe engine vibration. Ground looped on forced landing and burned. 13 inches of propeller blade was missing.

## Other investigations on N6589 (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 DEN79FTM21](https://openairdocs.org/ntsb/DEN79FTM21), Jul 21, 1979: Grumman G-164A (N6589), Richfield, UT, substantial damage
- [NTSB DEN76FTM47](https://openairdocs.org/ntsb/DEN76FTM47), Aug 23, 1976: Grumman G-164A (N6589), Leland, 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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