# NTSB DEN84FA016: Cessna TU-206A, N4831F, Loveland, CO, October 23, 1983

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Field investigation · Final report
- Date: October 23, 1983, 15:00 local (21:00 UTC)
- Place: Loveland, CO
- Coordinates: 40.360767, -105.180534 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.3608&lon=-105.1805&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 6 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 16178
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN84FA016
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16178/pdf
- Page: https://openairdocs.org/ntsb/DEN84FA016

## Sequence of events

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

- Airframe/component/system failure/malfunction, climb - to cruise
  - propeller system/accessories,blade - failure,total (cause)
  - emergency procedure - performed, pilot in command (contributing factor)
  - propeller system/accessories,blade - separation (cause)
  - remedial action - performed, pilot in command (contributing factor)
  - propeller system/accessories,blade - fatigue (cause)
  - propeller system/accessories,blade - stress corrosion (cause)
- Forced landing, landing - flare/touchdown
  - terrain condition - runway (contributing factor)

## Analysis

THE ACFT LOST PART OF ONE BLADE OF THE PROPELLER DURING THE CLIMB TO CRUISE PHASE OF OPERATION. THE PASSENGERS WERE SKYDIVERS SO THEY USED THEIR PARACHUTES IN AN EXIT OF THE ACFT AS THE AIRFRAME STARTED TO VIBRATE. THE PLT MADE A SUCCESSFUL LANDING ON THE ARPT WITHOUT POWER. ALL THE JUMPERS LANDED SAFETY. VISUAL EXAMINATION OF THE PROPELLER SHOWED THAT THE BLADE HAD SEPARATED 10 TO 12 INCHES OUTBOARD FROM THE BLADE ROOT. THE FRACTURE EXHIBITED EVIDENCE TYPICAL OF HIGH CYCLE FATIGUE AND OVERLOAD STRESS.

## Aircraft

- Registration: [N4831F](https://openairdocs.org/aircraft/N4831F), registered now, S/N U206-0531, built 1966 (OpenAirDocs)
- Reported make and model: CESSNA TU-206A
- Registry model: [Cessna TU206A](https://openairdocs.org/model/cessna-tu206a) (registry code 2073318) (OpenAirDocs)
- Registry engine: [Continental TSIO-520-C](https://openairdocs.org/engine/continental-tsio-520-c) (registry code 17251, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: CONTINENTAL TSIO-520-C 285 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 91
- Operator: Skys West Parachute Centers In
- Departed: FNL, LOVELAND, CO
- Flight plan: VFR/IFR
- Airport: Loveland

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 29; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: unknown, valid medical--no waivers/lim.; flight hours: 1,106 total, 210 in this make and model, 33 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 70 °F, dew point -0 °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 19831023055469A](https://openairdocs.org/incident/19831023055469A), Oct 23, 1983: Cessna TU206A, Ft Collins, CO, Substantial damage. Lost part of a prop blade. Jumpers left. Aircraft deadsticked to airport. Extensive vibration damage. Popped rivets.

## Other investigations on N4831F (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 DEN76AD066](https://openairdocs.org/ntsb/DEN76AD066), Aug 15, 1976: Cessna TU206 (N4831F), Ouray, 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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