# NTSB ANC85LA004: Cessna U206, N4863C, Hinchinbrook, AK, October 14, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: October 14, 1984, 10:30 local (18:30 UTC)
- Place: Hinchinbrook, AK
- Coordinates: 60.789531, -145.609405 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=60.7895&lon=-145.6094&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 4434
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC85LA004
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/4434/pdf
- Page: https://openairdocs.org/ntsb/ANC85LA004

## Sequence of events

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

- Airframe/component/system failure/malfunction, landing - roll
  - landing gear,nose gear assembly - corroded (cause)
- Nose gear collapsed, landing - roll
- Nose over, landing - roll

## Analysis

INVESTIGATION REVEALED THAT THE NOSE GEAR TORQUE LINK BOLT SHEARED DURING THE LANDING ROLL ON AN ABANDONED SAND AIRSTRIP CAUSING THE GEAR COLLAPSE AND NOSEOVER. METALLURGICAL TESTING DISCLOSED EVIDENCE OF LONG TERM PROGRESSION OF SEVERE CORROSION BETWEEN THE BOLT AND IT'S SLEEVE THE ACFT HAD BEEN INVOLVED IN OPERATIONS REQUIRING MULTIPLE TAKEOFFS AND LANDINGS PER HOUR, MANY OF WHICH WERE ON SALT WTER BEACHES.

## Aircraft

- Registration: [N4863C](https://openairdocs.org/deregistered/N4863C-1989-01-26), registration cancelled 1989-01-26, S/N U20603856 (OpenAirDocs)
- Reported make and model: CESSNA U206
- Registry model: [Cessna U206G](https://openairdocs.org/model/cessna-u206g) (registry code 2073356) (OpenAirDocs)
- Category: Airplane
- Serial number: U20603856
- Airframe hours: 4343
- Engines: CONTINENTAL IO-520-F 300 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 135
- Operator: Chitina Air Service, doing business as Chitina Air Service
- Registered owner: James M. Foode
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, March 5, 1984, 36 hours before
- Departed: CKU, CORDOVA, AK
- Destination: HINCHINBROOK, AK
- Flight plan: Company VFR
- Airport: Strawberry Point, runway 5, 1,800 ×  ft

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 29; commercial; airplane ratings: single-engine land, single-engine sea; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 4,860 total, 1,500 in this make and model, 4,790 as pilot in command, 350 in the last 90 days, 31 in the last 30 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 90 statute miles
- Lowest ceiling: none
- Temperature: 39 °F

## 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 19841014057579A](https://openairdocs.org/incident/19841014057579A), Oct 14, 1984: Cessna U206G, Hinchinbrook, AK, Substantial damage. Nose torque link bolt failed while landing on a rough abandoned strip. Aircraft nosed over. Bolt badly corroded.

## Other investigations on N4863C (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 ANC85LA073](https://openairdocs.org/ntsb/ANC85LA073), Apr 26, 1985: Cessna 206 (N4863C), Seward, AK, substantial 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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