# NTSB ANC91LA002: Cessna 185B, N2525Z, Koyuktolik, AK, October 7, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: October 6, 1990, 16:04 local (Oct 7, 1990, 00:04 UTC)
- Place: Koyuktolik, AK
- Coordinates: 59.399715, -151.320541 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=59.3997&lon=-151.3205&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report November 9, 1992
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 5500
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC91LA002
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5500/pdf
- Page: https://openairdocs.org/ntsb/ANC91LA002

## Probable cause

PILOT-IN-COMMAND'S FAILURE TO PROPERLY EXECUTE A STABILIZED APPROACH TO THE FIRST 1/3 OF THE RUNWAY. CONTRIBUTING TO THE ACCIDENT WAS THE EXCESSIVE AIRPSEED MAINTAINED DURING THE APPROACH AND LANDING.

## 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
  - proper touchdown point - not attained, pilot in command (cause)
- Roll over, landing - roll
  - airspeed - excessive, pilot in command (cause)

## Analysis

ACCORDING TO THE CHIEF PILOT, WHO OBSERVED THE ACIDENT, THE AIRPLANE LANDED MID-FIELD WITH EXCESSIVE LANDING SPEED. THE AIRPLANE'S TAIL WHEEL NEVER TOUCHED THE GROUND DURING THE LANDING ROLL AND AS IT NEARED THE END OF THE RUNWAY IT VEERED TO THE RIGHT. THE MAIN LANDING GEAR COLLAPSED AND THE AIRPLANE ROLLED OVER AFTER SHEARING ITS WINGS. EXAMINATION OF THE MAIN LANDING GEAR AND BRAKE SYSTEM REVEALED NO MECHANICAL FAILURE OR PRE IMPACT MALFUNCTION. THE PILOT WAS NEWLY HIRED.

## Aircraft

- Registration: [N2525Z](https://openairdocs.org/aircraft/N2525Z), registered now, S/N 185-0525, built 1962 (OpenAirDocs)
- Reported make and model: CESSNA 185B
- Registry model: [Cessna 185B](https://openairdocs.org/model/cessna-185b) (registry code 2072806) (OpenAirDocs)
- Registry engine: [Continental I0-470 series](https://openairdocs.org/engine/continental-i0-470-series) (registry code 17027, reciprocating) (OpenAirDocs)
- Category: Airplane
- Airframe hours: 4469
- Engines: CONTINENTAL IO-520-F 285 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 135
- Operator: Raven Air
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, September 12, 1990, 64 hours before
- Departed: ANC, ANCHORAGE, AK
- Flight plan: Company VFR
- Airport: NONE, Koyuktolik Bay

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 38; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 6,000 total, 211 in this make and model, 6,000 as pilot in command, 150 in the last 90 days, 60 in the last 30 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 25,000 statute miles
- Lowest ceiling: none
- Temperature: 45 °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 19901006044169A](https://openairdocs.org/incident/19901006044169A), Oct 6, 1990: Cessna 185B, Koyukuk, AK, Substantial damage. Landed long and fast. Unable to stop on short strip. Ground looped and caused aircraft to roll over several times.

## Other investigations on N2525Z (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 ANC75PAG17](https://openairdocs.org/ntsb/ANC75PAG17), Aug 22, 1974: Cessna 185 (N2525Z), Anchorage, 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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