# NTSB DEN84LA005: Cessna R182, N7039W, Grovont, WY, October 7, 1983

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: October 7, 1983, 17:00 local (23:00 UTC)
- Place: Grovont, WY
- Coordinates: 43.470027, -110.76081 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.4700&lon=-110.7608&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor, 4 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 16280
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN84LA005
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16280/pdf
- Page: https://openairdocs.org/ntsb/DEN84LA005

## 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 - turn to reverse direction
  - engine assembly,crankshaft - fatigue (cause)
- Forced landing, landing
- In flight collision with terrain/water, landing - flare/touchdown
  - terrain condition - mountainous/hilly (contributing factor)
  - terrain condition - rough/uneven (contributing factor)

## Analysis

THE PLT REPORTED THAT AFTER TAKING OFF, THE GEAR WARNING HORN SOUNDED WHEN HE RETRACTED THE GEAR. HE CONTINUED EN ROUTE WHILE TRYING TO GET A SAFE INDICATION. SUBSEQUENTLY, APRX 20 MI EAST OF THE DEPARTURE POINT, HE ELECTED TO ENTEND THE GEAR & RETURN TO THE ARPT. AFTER INITIATING A TURN BACK TO THE WEST, HE HEARD A LOUD BANGING OR KNOCKING NOISE FROM THE FRONT OF THE ACFT. ABOUT 30 SEC LATER, THE ENG COMPLETELY LOST POWER. HE FOUND AN AREA OF RELATIVELY FLAT TERRAIN AMONG STEEP MOUNTAIN RIDGES & ELECT TO LAND THERE. DURING THE LANDING, THE ACFT BOUNCED & SLID TO A STOP ABOUT 100 FT FROM THE INITIAL TOUCHDOWN POINT. A SUBSEQUENT ENG TEARDOWN & METALLURGICAL EXAM REVEALED THAT THE CRANKSHAFT HAD FAILED FROM FATIGUE AT THE CHEEK JUST FORWARD OF THE #3 BEARING. THE ACFT HAD PREVIOUSLY BEEN INVOLVED IN A MISHAP ON 1/19/80, IN WHICH, THE PROPELLER WAS DAMAGED. REPORTEDLY, THE ENG HAD NO POWER & THE PROPELLER WAS WINDMILLING DURING A LANDING IMPACT ON 1/19/80.

## Aircraft

- Registration: [N7039W](https://openairdocs.org/deregistered/N7039W-1986-07-01), registration cancelled 1986-07-01, S/N R18200050 (OpenAirDocs)
- Reported make and model: CESSNA R182
- Registry model: [Cessna R182](https://openairdocs.org/model/cessna-r182) (registry code 2072734) (OpenAirDocs)
- Category: Airplane
- Serial number: R18200050
- Airframe hours: 1076
- Engines: LYCOMING O-540-J3C5D 235 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Paul Imeson
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, August 5, 1983, 79 hours before
- Departed: JAC, JACKSON, WY
- Destination: LAR, LARAMIE, WY

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 32; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 233 total, 43 in this make and model, 196 as pilot in command, 2 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 270° at 20 knots, gusting 25
- Visibility: 100 statute miles
- Lowest ceiling: none
- Temperature: 61 °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 19831007054179A](https://openairdocs.org/incident/19831007054179A), Oct 7, 1983: Cessna R182, Grovont, WY, Substantial damage. Loud knocking noise and power loss preceeded a crash landing. Crankshaft fatigue induced failure. Prior prop strike

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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