# NTSB ANC91LA033: Cessna A185-F, N1855Q, Shageluk, AK, March 8, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: March 8, 1991, 15:00 local (19:00 UTC)
- Place: Shageluk, AK
- Coordinates: 62.640117, -159.53096 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=62.6401&lon=-159.5310&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 3 uninjured
- Status: Completed, report March 24, 1993
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 5524
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC91LA033
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5524/pdf
- Page: https://openairdocs.org/ntsb/ANC91LA033

## Probable cause

THE COLLAPSE OF THE LEFT MAIN LANDING GEAR DURING THE LANDING ROLL DUE TO PREEXISTING CRACKS.

## Analysis

THE PILOT STATED THAT ABOUT 2 SECONDS AFTER HE TOUCHED DOWN WITH THE WHEEL/SKI EQUIPPED AIRPLANE, THE LEFT MAIN LANDING GEAR COLLAPSED AT THE UPPER ATTACHING POINT.  EXAMINATION OF THE LEFT OUTBOARD LANDING GEAR SUPPORT (CESSNA PART NUMBER 0713495 64) FOUND THAT IT HAD FAILED DUE TO PREEXISTING CRACKS.  THE OPERATOR REPORTED THAT MOST OF THE 4,520 HOURS ON THE AIRPLANE AND THE FAILED SUPPORT WERE ACCUMULATED WITH THE AIRPLANE OPERATING ON ROUGH TERRAIN WITH WHEEL/SKIS INSTALLED.

## 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,main gear attachment - failure,total
  - landing gear,main gear attachment - cracked (cause)
  - terrain condition - rough/uneven (contributing factor)
- Main gear collapsed, landing - roll
  - landing gear,main gear attachment - failure,total (cause)

## Aircraft

- Registration: N1855Q (not matched to a registry record)
- Reported make and model: CESSNA A185-F
- Category: Airplane
- Serial number: 18503494
- Airframe hours: 4520
- Engines: CONTINENTAL IO-520D 300 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 135
- Operator: James F. Okonek, doing business as K2 Aviation
- Registered owner: James F. Okonek
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, February 26, 1992, 16 hours before
- Departed: NONE, IDITAROD, AK
- Flight plan: VFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 40; flight instructor, airline transport, flight engineer; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 9,000 total, 580 in this make and model, 80 in the last 90 days, 35 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 120° at 3 knots
- Visibility: 30 statute miles
- Lowest ceiling: 7,000 ft broken
- Temperature: 10 °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 19910308006489A](https://openairdocs.org/incident/19910308006489A), Mar 8, 1991: Cessna 185, Shageluk, AK, Substantial damage. Wheel ski equipped aircraft had the left main gear collapse.

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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