# NTSB ANC91LA108: Cessna 185, N6166N, Clarks Point, AK, July 23, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: July 23, 1991, 15:15 local (23:15 UTC)
- Place: Clarks Point, AK
- Coordinates: 58.830677, -158.529632 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=58.8307&lon=-158.5296&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed, report February 8, 1993
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 5586
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC91LA108
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5586/pdf
- Page: https://openairdocs.org/ntsb/ANC91LA108

## Probable cause

THE LOSS OF DIRECTIONAL CONTROL ON THE GROUND CAUSED BY THE FAILURE OF THE LEFT BRAKE DISC. CONTRIBUTING TO THE ACCIDENT WAS THE PILOT-IN-COMMAND'S INTENTIONAL GROUND LOOP OF THE AIRPLANE.

## Sequence of events

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

- Loss of control - on ground/water, landing - roll
  - landing gear,normal brake system - failure,partial (cause)
- Dragged wing,rotor,pod,float or tail/skid, landing - roll
  - ground loop/swerve - intentional, pilot in command (contributing factor)

## Analysis

DURING LANDING, THE PILOT-IN-COMMAND LOST THE EFFECTIVENESS OF HIS LEFT BRAKE. HE ELECTED TO GROUND LOOP THE AIRPLANE RATHER THAN RUN OFF INTO THE TUNDRA. EXAMINATION OF THE LEFT BRAKE ASSEMBLY REVEALED THAT THE BRAKE DISC HAD SEPARATED FROM THE ASSEMBLY.

## Aircraft

- Registration: [N6166N](https://openairdocs.org/aircraft/N6166N), registered now, S/N 18504302, built 1981 (OpenAirDocs)
- Reported make and model: CESSNA 185
- Registry model: [Cessna A185F](https://openairdocs.org/model/cessna-a185f) (registry code 2072821) (OpenAirDocs)
- Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 18504302
- Airframe hours: 2284
- Engines: CONTINENTAL IO-520-F 300 horsepower reciprocating
- Damage: Substantial damage
- Flight: Business, Part 91
- Operator: Carl Forgey, doing business as All Alaskan Seafood, Inc.
- Registered owner: All Alaskan Seafoods, Inc
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, June 12, 1991, 57 hours before
- Departed: 5NK, NAKNEK, AK
- Flight plan: Company VFR
- Airport: CLP, Clarks Point

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 39; flight instructor, commercial; airplane ratings: single-engine sea, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 4,500 total, 1,000 in this make and model, 4,400 as pilot in command, 250 in the last 90 days, 100 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 70° at 18 knots, gusting 20
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 68 °F, dew point -0 °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 19910723029659A](https://openairdocs.org/incident/19910723029659A), Jul 23, 1991: Cessna A185F, Clarks Point, AK, Substantial damage. No left brake on landing. Intentionally ground looped to prevent overrun. Brake puck had torn loose.

## Other investigations on N6166N (2)

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 ANC95LA032](https://openairdocs.org/ntsb/ANC95LA032), Mar 4, 1995: Cessna 185F (N6166N), Port Alsworth, AK, substantial damage. Probable cause: THE PILOT'S INADVERTENT ACTIVATION OF THE RIGHT BRAKE PEDAL DURING THE LANDING ROLL.
- [NTSB SEA89LA062](https://openairdocs.org/ntsb/SEA89LA062), Mar 26, 1989: Cessna 185 (N6166N), Everett, WA, substantial damage. Probable cause: THE FAILURE OF THE PILOT TO MAINTAIN DIRECTIONAL CONTROL OF THE TAILWHEEL AIRCRAFT DURING LANDING ROLL.

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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