# NTSB ANC85LA053: Cessna 207, N9937M, Mcgrath, AK, March 11, 1985

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: March 11, 1985, 15:35 local (19:35 UTC)
- Place: Mcgrath, AK
- Coordinates: 63.609783, -154.779159 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=63.6098&lon=-154.7792&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 office: Alaska Regional Office
- NTSB case key (mKey): 4470
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC85LA053
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/4470/pdf
- Page: https://openairdocs.org/ntsb/ANC85LA053

## 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, climb - to cruise
  - engine assembly,crankshaft - failure,total (cause)
  - engine assembly,crankshaft - undetermined (cause)
- Forced landing, descent - emergency
- In flight collision with object, landing - flare/touchdown
  - object - tree(s)

## Analysis

THE ACFT CONTACTED TREES DURING A FORCED LANDING FOLLOWING AN ENGINE FAILURE. INVESTIGATION REVEALED THE CRANKSHAFT HAD FAILED FOR UNDETERMINED REASONS. THE ENGING HAD A TOTAL TIME OF 1312 HRS SINCE MAJOR OVERHAUL.

## Aircraft

- Registration: [N9937M](https://openairdocs.org/deregistered/N9937M-2018-01-17), registration cancelled 2018-01-17, S/N 20700753, built 1982 (OpenAirDocs)
- Reported make and model: CESSNA 207
- Registry model: [Cessna 207A](https://openairdocs.org/model/cessna-207a) (registry code 2073605) (OpenAirDocs)
- Registry engine: [Continental IO-520-F](https://openairdocs.org/engine/continental-io-520-f) (registry code 17237, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 20700753
- Airframe hours: 3027
- Engines: CONTINENTAL IO-520-F 300 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Baker Aviation
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, April 6, 1984, 61 hours before
- Departed: MCG, MCGRATH, AK
- Destination: OTZ, KOTZEBUE, AK
- Flight plan: VFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 22; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 1,520 total, 70 in this make and model, 1,380 as pilot in command, 55 in the last 90 days, 30 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 160° at 15 knots
- Visibility: 20 statute miles
- Lowest ceiling: none
- Temperature: 30 °F, dew point 19 °F
- Altimeter: 29.00 inHg
- Observed at: MCG

## 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 19850311007999A](https://openairdocs.org/incident/19850311007999A), Mar 11, 1985: Cessna 207A, Mcgrath, AK, Substantial damage. Crankshaft failed, aircraft struck trees during emergency landing. Reason for crankshaft failure is undetermined.

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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