# NTSB LAX86LA112: Cessna TU206G, N5340X, Flagstaff, AZ, February 7, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: February 7, 1986, 16:00 local (23:00 UTC)
- Place: Flagstaff, AZ
- Coordinates: 35.22953, -111.719367 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=35.2295&lon=-111.7194&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): 25069
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX86LA112
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/25069/pdf
- Page: https://openairdocs.org/ntsb/LAX86LA112

## Sequence of events

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

- Fire/explosion, cruise - normal
  - exhaust system,stack - loose (cause)
- Forced landing, descent - emergency
- On ground/water collision with object, landing - roll
  - object - fence (contributing factor)
- On ground/water encounter with terrain/water, landing - roll
  - terrain condition - rough/uneven (contributing factor)

## Analysis

WHILE RETURNING FROM GRAND CANYON, AZ, 14 CFR 135 SIGHTSEEING FLT TO SCOTTSDALE, AZ, THE PLT REPORTED THE ACFT EXPERIENCED A POWER LOSS; ALL OTHER INSTRUMENT INDICATIONS WERE NORMAL. THE PLT ENRICHED THE MIXTURE AND CHANGED FUEL TANKS BUT TO NO AVAIL. THE PLT ELECTED TO DIVERT TO PULLIAM ARPT (FLG), FLAGSTAFF, AZ. AFTER TURNING THE ACFT TOWARDS FLG SMOKE BEGAN TO ENTER THE CABIN AREA FROM BENEATH THE INST PANEL. AFTER SECURING ALL ELECTRICAL POWER THE SMOKE DIMINISHED MOMENTARAILY. SHORTLY THEREAFTER THE ENGINE BEGAN TO LOSE MORE POWER AND THE CABIN BEGAN TO FILL UP WITH SMOKE. THE PILOT ELECTED TO LAND IN AN OPEN FLD. DURING THE LANDING ROLL, THE ACFT STRUCK 3 FENCE LINES AND A DIRT EMBANKMENT. EXAM OF THE ENGINE DSCLSD THE NO. 1 CYLINDER AFT ATTACH EXH STUDS HAD SHEARED OFF AND THE FWD STUDS ATTACH NUTS WERE LOOSE.

## Aircraft

- Registration: [N5340X](https://openairdocs.org/deregistered/N5340X-2000-04-12), registration cancelled 2000-04-12, S/N U20605658 (OpenAirDocs)
- Reported make and model: CESSNA TU206G
- Registry model: [Cessna TU206G](https://openairdocs.org/model/cessna-tu206g) (registry code 2073357) (OpenAirDocs)
- Category: Airplane
- Serial number: 820605658
- Airframe hours: 1800
- Engines: CONTINENTAL TSIO-520-M 310 horsepower reciprocating
- Damage: Substantial damage
- Fire: In-Flight
- Flight: Part 135
- Operator: Superstition Air Service
- Registered owner: Lbs Distributors, Inc.
- Airworthiness certificate: Standard, Normal
- Departed: SDS, SCOTTSDALE, AZ
- Destination: NONE
- Airport: FLG, Pulliam

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 24; airline transport, private; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 1,200 total, 45 in this make and model, 1,035 as pilot in command, 200 in the last 90 days, 75 in the last 30 days, 7 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 180° at 9 knots
- Visibility: 20 statute miles
- Lowest ceiling: none
- Temperature: 30 °F, dew point 18 °F
- Altimeter: 29.00 inHg
- Observed at: FLG, 13 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 19860207002339A](https://openairdocs.org/incident/19860207002339A), Feb 7, 1986: Cessna TU206G, Flagstaff, AZ, Substantial damage. Loss of power and smoke in cockpit en route. Struck fence lines during forced landing. Cylinder studs sheared off.

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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