# NTSB ANC85IA083: Cessna 207A, N9943M, Cape Simpson, AK, May 13, 1985

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: May 13, 1985, 12:00 local (20:00 UTC)
- Place: Cape Simpson, AK
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 7 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 4430
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC85IA083
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/4430/pdf
- Page: https://openairdocs.org/ntsb/ANC85IA083

## Sequence of events

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

- Airframe/component/system failure/malfunction, cruise
  - engine assembly,connecting rod - disconnected (cause)
  - maintenance,major repair - inattentive, other maintenance personnel (cause)
  - improper use of procedure, other maintenance personnel (contributing factor)
- Loss of engine power(total) - mech failure/malf, cruise
- Hard landing, descent - emergency
  - terrain condition - snow covered

## Analysis

# 6 CYL EXPLODED IN FLT DUE TO CONNECTING ROD COMING APART. POST-ACCIDENT INSP REVEALED THAT NUT HAD BACK OFF DUE TO INADEQUATE TORQUE & NO COTTER KEY INSTALLED IN NUT.

## Aircraft

- Registration: [N9943M](https://openairdocs.org/aircraft/N9943M), registered now, S/N 20700757, built 1982 (OpenAirDocs)
- Reported make and model: CESSNA 207A
- 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: 20700757
- Airframe hours: 1858
- Engines: CONTINENTAL IO-520-F 300 horsepower reciprocating
- Damage: Minor damage
- Flight: Part 135
- Operator: Barrow Air, doing business as Barrow Air
- Registered owner: Edward J. Schollemberg
- Airworthiness certificate: Standard, Normal; Standard, Utility
- Last inspection: Annual, March 1, 1985, 50 hours before
- Departed: BRW, BARROW, AK
- Destination: 10AK, NUIQSUT, AK
- Flight plan: VFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 26; flight instructor, airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 3,800 total, 1,500 in this make and model, 2,400 as pilot in command, 200 in the last 90 days, 7 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 30° at 12 knots
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 10 °F, dew point 3 °F
- Altimeter: 29.00 inHg
- Observed at: BRW, 35 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).

- [Incident 19850513047869I](https://openairdocs.org/incident/19850513047869I), May 13, 1985: Cessna 207A, Cape Simpson, AK, Minor damage. Landed on snow covered tundra after engines sent parts thru cowling. Improperly installed connecting rod nuts.

## Other investigations on N9943M (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 ANC86IA033](https://openairdocs.org/ntsb/ANC86IA033), Mar 10, 1986: Cessna 207 (N9943M), Barrow, AK, incident, minor 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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