# NTSB ANC86LA096: Cessna 170B, N2806C, Alexander Creek, AK, July 1, 1986

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: June 30, 1986, 18:30 local (Jul 1, 1986, 02:30 UTC)
- Place: Alexander Creek, AK
- Coordinates: 55.91954, -159.490646 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=55.9195&lon=-159.4906&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 4690
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC86LA096
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/4690/pdf
- Page: https://openairdocs.org/ntsb/ANC86LA096

## Sequence of events

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

- Roll over, landing - roll
  - terrain condition - loose gravel/sandy (contributing factor)
  - unsuitable terrain or takeoff/landing/taxi area - selected, pilot in command (cause)

## Analysis

WHILE LANDING ON A RIVER BAR, THE ACFT DRIFTED TO THE LEFT OF THE NORMAL TOUCHDOWN ZONE. SUBSEQUENTLY, THE WHEELS ENTERED SOFT SAND AND THE AIRPLANE TURNED OVER.

## Aircraft

- Registration: [N2806C](https://openairdocs.org/aircraft/N2806C), registered now, S/N 26349 (OpenAirDocs)
- Reported make and model: CESSNA 170B
- Registry model: [Cessna 170B](https://openairdocs.org/model/cessna-170b) (registry code 2072306) (OpenAirDocs)
- Category: Airplane
- Serial number: 26349
- Airframe hours: 6262
- Engines: CONTINENTAL C-145-2 145 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: William Frederic Koester
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, November 2, 1985, 37 hours before
- Departed: LHD, ANCHORAGE, AK

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 51; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 594 total, 178 in this make and model, 556 as pilot in command, 18 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 90 statute miles
- Lowest ceiling: none
- Temperature: 64 °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 19860630031599A](https://openairdocs.org/incident/19860630031599A), Jun 30, 1986: Cessna 170B, Alexander Creek, AK, Substantial damage. The aircraft flipped over after encountering soft sand during landing rollout on a river gravel bar.

## Other investigations on N2806C (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 ANC99LA112](https://openairdocs.org/ntsb/ANC99LA112), Jul 1, 1999: Cessna 170B (N2806C), Wasilla, AK, substantial damage. Probable cause: The student pilot's inadvertent ground loop during the takeoff roll. A factor in this accident was the a left crosswind.
- [NTSB MKC68F0241](https://openairdocs.org/ntsb/MKC68F0241), Sep 17, 1967: Cessna 170B (N2806C), Howard Lake, MN, 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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