# NTSB ANC84IA101: Cessna 207A, N75941, Larsen Bay, AK, June 25, 1984

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: June 25, 1984, 11:10 local (19:10 UTC)
- Place: Larsen Bay, AK
- Coordinates: 62.08921, -163.709167 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=62.0892&lon=-163.7092&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 4245
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC84IA101
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/4245/pdf
- Page: https://openairdocs.org/ntsb/ANC84IA101

## 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, cruise - normal
  - engine assembly,connecting rod - failure,total (cause)
- Forced landing, descent - emergency
- Nose gear collapsed, landing - roll
  - terrain condition - high vegetation (contributing factor)

## Analysis

ABOUT 12 MINS AFTER TAKEOFF WHILE AT 2300 FT MSL, THE ENG BEGAN TO SHAKE, OIL COVERED THE WINDSHIELD & OIL PRESSURE WAS LOST. SUBSEQUENTLY, THE PLT MADE A FORCED LANDING IN AN AREA OF TALL GRASS ON A RIVER DELTA. DURING THE LANDING, THE NOSE GEAR COLLAPSED & THE PROP WAS DAMAGED. AN EXAM REVEALED THE #2 CONNECTING ROD, P/N 633403, HAD FAILED & PUNCTURED A HOLE IN THE ENG CRANKCASE.

## Aircraft

- Registration: N75941 (not matched to a registry record)
- Reported make and model: CESSNA 207A
- Category: Airplane
- Serial number: 20700656
- Airframe hours: 1272
- Engines: CONTINENTAL IO-520-F 300 horsepower reciprocating
- Damage: Minor damage
- Flight: Part 135
- Registered owner: Uyak Air Service
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, May 19, 1984, 60 hours before
- Departed: LARSEN BAY, AK

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 30; commercial; airplane ratings: single-engine land, single-engine sea; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 1,494 total, 103 in this make and model, 1,304 as pilot in command, 211 in the last 90 days, 100 in the last 30 days, 5 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 270° at 10 knots
- Visibility: 15 statute miles
- Lowest ceiling: 3,300 ft overcast
- Temperature: 50 °F, dew point 9 °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).

- [Incident 19840625053519I](https://openairdocs.org/incident/19840625053519I), Jun 25, 1984: Cessna 207A, Larsen Bay, AK, Minor damage. Forced landing caused by engine failure during climb after takeoff. P n 633403 connecting rod separated.

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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