# NTSB DEN83LA135: Cessna TU206G, N732ZQ, Molina, CO, June 8, 1983

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: June 8, 1983, 14:18 local (20:18 UTC)
- Place: Molina, CO
- Location: 39.1891° N, 108.0604° W: Placed by OpenAirDocs: center of Molina, CO, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=39.1891&lon=-108.0604&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 16089
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN83LA135
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16089/pdf
- Page: https://openairdocs.org/ntsb/DEN83LA135

## Sequence of events

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

- Loss of engine power(partial) - mech failure/malf, cruise - normal
  - exhaust system,turbocharger - improper (cause)
  - exhaust system,turbocharger - loose (cause)
  - maintenance,inspection - inadequate, other maintenance personnel (cause)
  - exhaust system,turbocharger - separation (cause)
- Forced landing, landing - flare/touchdown
- Nose over, landing - roll

## Analysis

THE PILOT HAD LEVELED OFF AT 17500 FT MSL WHEN THE ENGINE MADE A DETONATING SOUND AND LOST POWER. MANIFOLD PRESSURE WENT TO ABOUT 12 INCHES. FUEL PRESSURE WAS NORMAL BUT THE CYLINDER HEAD TEMPERATURE FELL RAPIDLY. AT 9000 FT MSL THE ENGINE SURGED TO ABOUT 16 INCHES OF MANIFOLD PRESSURE. WHEN THE PILOT LEANED THE MIXTURE THE ENGINE VIBRATED SEVERELY SO THE PILOT SECURED THE ENGINE. POST ACCIDENT INVESTIGATION REVEALED THAT THE RUBBER HOSE FROM THE TURBOCHARGER COMPRESSOR DUCT TO THE THROTTLE BODY DUCT HAD SEPARATED.

## Aircraft

- Registration: N732ZQ (not matched to a registry record)
- Reported make and model: CESSNA TU206G
- Category: Airplane
- Serial number: U20604747
- Airframe hours: 932
- Engines: CONTINENTAL TSIO-520-M 285 horsepower reciprocating
- Damage: Substantial damage
- Flight: Business, Part 91
- Operator: Monarch Aviation
- Registered owner: Gordon Engineering Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, March 15, 1983, 5 hours before
- Departed: GJT, GRAND JUNCTION, CO
- Destination: DEN, DENVER, CO

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 37; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 1,263 total, 72 in this make and model, 1,171 as pilot in command, 9 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 350° at 11 knots
- Visibility: 50 statute miles
- Lowest ceiling: 25,000 ft overcast
- Temperature: 82 °F, dew point 45 °F
- Altimeter: 29.00 inHg
- Observed at: GJT, 22 nm away

## 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 19830608023629A](https://openairdocs.org/incident/19830608023629A), Jun 8, 1983: Cessna TU206G, Molina, CO, Substantial damage. Turbocharger coupler hose came loose. Caused overrich mixture and power loss. Pilot could have leaned mixture.

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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