# NTSB ANC89LA008: de Havilland DHC-3, N90574, Bonanza Hills, AK, October 12, 1988

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: October 11, 1988, 16:00 local (Oct 12, 1988, 00:00 UTC)
- Place: Bonanza Hills, AK
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report August 8, 1989
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 5139
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC89LA008
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5139/pdf
- Page: https://openairdocs.org/ntsb/ANC89LA008

## Analysis

THE COMMERCIAL PILOT WAS ATTEMPTING TO LAND ON A PRIVATE GRAVEL AIRSTRIP IN RURAL ALASKA. DURING THE LANDING ROLL, THE LEFT MAIN LANDING GEAR ENCOUNTERED SNOW ALONG THE RUNWAY EDGE AND VEERED SHARPLY TO THE LEFT AND OFF THE RUNWAY.

## 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
  - terrain condition - snow covered (contributing factor)
  - unsuitable terrain or takeoff/landing/taxi area - selected, pilot in command (contributing factor)
  - clearance - misjudged, pilot in command (cause)
  - directional control - not maintained, pilot in command (cause)
- Main gear collapsed, landing - roll

## Aircraft

- Registration: N90574 (not matched to a registry record)
- Reported make and model: de Havilland DHC-3
- Category: Airplane
- Serial number: 174
- Engines: P&W R-1340 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Lake Clark Air
- Registered owner: Lake Clark Air
- Airworthiness certificate: Standard, Normal
- Departed: NONE, PORT ALSWORTH, AK
- Airport: Private Strip

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 41; commercial; airplane ratings: single-engine land, single-engine sea, multi-engine land; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 8,900 total, 1,400 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 0° at 6 knots
- Visibility: 50 statute miles
- 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 19881011046329A](https://openairdocs.org/incident/19881011046329A), Oct 11, 1988: Dhav DHC3, Bonanza Hills, AK, Substantial damage. Left main wheel hit snow on edge of the gravel strip on landing. Aircraft veered left off the runway.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.