# NTSB ANC92LA045: Cessna 207A, N6312H, Quinhagak, AK, February 28, 1992

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: February 28, 1992, 16:25 local (20:25 UTC)
- Place: Quinhagak, AK
- Coordinates: 59.740657, -161.890258 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=59.7407&lon=-161.8903&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report May 26, 1993
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 5697
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC92LA045
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5697/pdf
- Page: https://openairdocs.org/ntsb/ANC92LA045

## Probable cause

THE TOTAL LOSS OF ENGINE POWER FOR UNDETERMINED REASONS.  A CONTRIBUTING FACTOR WAS THE LACK OF SUITABLE TERRAIN ON WHICH TO MAKE THE FORCED LANDING.

## Analysis

THE PILOT STATED THAT WHILE AT CRUISE FLIGHT AT 3,700 FEET MSL, HE MADE A POWER REDUCTION IN PREPARATION TO DESCEND TO 3,000 FEET.  AT THAT TIME HE HEARD A LOUD BANG AND THE ENGINE QUIT SUDDENLY AND COMPLETELY.  NO PROBLEMS WERE FOUND WITH THE FUEL OR THE AIRPLANE'S FUEL OR ELECTRICAL SYSTEMS.  THE ENGINE OPERATED NORMALLY ON A TEST STAND, AND WAS DISASSEMBLED AND LATER RETURNED TO SERVICE WITH NO PROBLEMS NOTED.

## Sequence of events

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

- Loss of engine power(total) - nonmechanical, cruise - normal
  - reason for occurrence undetermined (cause)
- Forced landing, descent - emergency
- Nose gear collapsed, landing - flare/touchdown
  - terrain condition - none suitable (contributing factor)
- Dragged wing,rotor,pod,float or tail/skid, landing - flare/touchdown

## Aircraft

- Registration: [N6312H](https://openairdocs.org/deregistered/N6312H-2002-05-02), registration cancelled 2002-05-02, S/N 20700477, built 1978 (OpenAirDocs)
- Reported make and model: CESSNA 207A
- Registry model: [Cessna 207A](https://openairdocs.org/model/cessna-207a) (registry code 2073604) (OpenAirDocs)
- Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 20700477
- Airframe hours: 6373
- Engines: CONTINENTAL IO-520-F13 300 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 135
- Operator: Markair Express, Inc.
- Registered owner: Markair Express, Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: AAIP, February 26, 1992, 4 hours before
- Departed: GNU, GOODNEWS, AK
- Destination: BET, BETHEL, AK
- Flight plan: Company VFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 36; airline transport; airplane ratings: single-engine land, multi-engine land, single-engine sea; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; toxicology performed; flight hours: 4,500 total, 1,000 in this make and model, 4,300 as pilot in command, 125 in the last 90 days, 60 in the last 30 days, 5 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 180° at 5 knots, gusting 8
- Visibility: 20 statute miles
- Lowest ceiling: none
- Temperature: -0 °F
- Altimeter: 29.00 inHg

## 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 19920228040649A](https://openairdocs.org/incident/19920228040649A), Feb 28, 1992: Cessna 207A, Quinhagak, AK, Substantial damage. Reported loud bang and engine quit. Nose gear collapsed and wing hit ground landing. Engine ran normal on test.

## Other investigations on N6312H (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 ANC99FA021](https://openairdocs.org/ntsb/ANC99FA021), Jan 10, 1999: Cessna 207 (N6312H), Quinhagak, AK, substantial damage. Probable cause: Loss of engine power due to fracture of the engine crankshaft, and the manufacturer's improper manufacturing procedure during engine assembly. Factors associated with the accident were the…

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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