# NTSB DEN82FTC09: Bell 47G-3B-L, N8529F, Kaycee, WY, August 8, 1982

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Final report
- Date: August 8, 1982, 08:00 local (14:00 UTC)
- Place: Kaycee, WY
- Location: 43.7100° N, 106.6373° W: Placed by OpenAirDocs: center of Kaycee, WY, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=43.7100&lon=-106.6373&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal
- Status: Completed, report August 8, 1983
- Report: Approved by Office Director
- NTSB case key (mKey): 71236
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN82FTC09
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/71236/pdf
- Page: https://openairdocs.org/ntsb/DEN82FTC09

## 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, takeoff
  - cooling system - failure,total (cause)
  - operation with known deficiencies in equipment - initiated, pilot in command (cause)
- Forced landing, approach - vfr pattern - final approach
  - autorotation - performed, pilot in command
- In flight collision with object, approach - vfr pattern - final approach
  - terrain condition - mountainous/hilly (contributing factor)
  - object - tree(s) (contributing factor)
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

THE PILOT WAS HAVING COOLING FAN PROBLEMS, SOME BLADES HAD BROKEN. HE LANDED IN A CANYON STAYED OVERNIGHT TO COOL ENGINE AND PLANNED TO FLY TO TOP OF THE CANYON TO GET REPAIRS. AFTER TAKEOFF, THE HELICOPTER HAD CLIMBED ALMOST LEVEL WITH THE TOP OF THE CANYON WHEN THE ENGINE FAILED. DURING AN EMERGENCY LANDING, THE HELICOPTER HIT THE TOPS OF 3 TREES, THEN CRASHED ON ITS TOP. AN EXAMINATION OF THE COOLING FAN REVEALED THAT IT WAS WORN, HAD REWORKED PARTS, CONTAINED INCORRECT PARTS, AND 13 FATIQUE CRACKS WERE FOUND IN THE FAN.

## Aircraft

- Registration: [N8529F](https://openairdocs.org/deregistered/N8529F-2018-03-01), registration cancelled 2018-03-01, S/N 3386, built 1965 (OpenAirDocs)
- Reported make and model: BELL 47G-3B-L
- Registry model: [Bell 47G-3B-1](https://openairdocs.org/model/bell-47g-3b-1) (registry code 1181028) (OpenAirDocs)
- Registry engine: [Lycoming 0-435](https://openairdocs.org/engine/lycoming-0-435) (registry code 41516, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Serial number: 3386
- Airframe hours: 4079
- Engines: LYCOMING TVO-435 280 horsepower reciprocating
- Damage: Destroyed
- Fire: On-Ground
- Flight: Personal, Part 91
- Operator: John C. Miller
- Registered owner: John C. Miller
- Departed: OUTLAW CANYON, WY
- Destination: OUTLAW CANYON, WY

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 46; commercial; airplane ratings: multi-engine land, single-engine land; medical: class 2, valid medical--no waivers/lim.; flight hours: 7,800 total, 3,050 in this make and model, 100 in the last 90 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 50 statute miles
- Temperature: 140 °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 19820808034899A](https://openairdocs.org/incident/19820808034899A), Aug 8, 1982: Bell 47G3B1, Kaycee, WY, Destroyed. Pilot departed with defective engine cooling fan. Engine overheated on climb. Rotor RPM decayed. Crashed inverted.

## Other investigations on N8529F (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 OAK70F0086](https://openairdocs.org/ntsb/OAK70F0086), Jul 23, 1969: Bell 47G3B1 (N8529F), Stirling Cy, CA, 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.