# NTSB ANC91LA083: Cessna 170B, N4659C, Lake Louise, AK, June 30, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 29, 1991, 23:15 local (Jun 30, 1991, 07:15 UTC)
- Place: Lake Louise, AK
- Coordinates: 62.100467, -145.530258 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=62.1005&lon=-145.5303&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report March 24, 1993
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 5567
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC91LA083
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5567/pdf
- Page: https://openairdocs.org/ntsb/ANC91LA083

## Probable cause

THE PILOT NOT MAINTAINING DIRECTIONAL CONTROL DURING THE TAKEOFF ROLL. CONTRIBUTING TO THE ACCIDENT WAS THE ROUGH CONDITION OF THE AIRSTRIP.

## Sequence of events

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

- Nose over, takeoff - roll/run
  - terrain condition - rough/uneven (contributing factor)
  - directional control - not maintained, pilot in command (cause)
- On ground/water collision with object, takeoff - roll/run
  - object - tree(s)

## Analysis

THE PILOT STATED THAT THE AIRSTRIP WAS ROUGH AND DURING THE TAKEOFF ROLL THE AIRPLANE HIT A HUMP AND BECAME AIRBORNE EARLIER THAN HE EXPECTED.  HE STATED HE HAD TOO MUCH RIGHT RUDDER APPLIED AND THE AIRPLANE VEERED OFF THE SIDE OF THE RUNWAY AND STRUCK SOME VEGETATION AND NOSED OVER.

## Aircraft

- Registration: [N4659C](https://openairdocs.org/aircraft/N4659C), registered now, S/N 25603, built 1953 (OpenAirDocs)
- Reported make and model: CESSNA 170B
- Registry model: [Cessna 170B](https://openairdocs.org/model/cessna-170b) (registry code 2072306) (OpenAirDocs)
- Registry engine: [Continental C145 series](https://openairdocs.org/engine/continental-c145-series) (registry code 17012, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 225603
- Airframe hours: 4416
- Engines: LYCOMING O-360 180 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: John D. Glass
- Registered owner: John D. Glass
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, April 8, 1991, 29 hours before
- Destination: Z15, BIRCHWOOD, AK
- Flight plan: VFR
- Airport: Z55, Lake Louise, runway 32, 2,000 × 50 ft, dirt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 47; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 177 total, 31 in this make and model, 110 as pilot in command, 33 in the last 90 days, 9 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 60 statute miles
- Temperature: 70 °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 19910629024959A](https://openairdocs.org/incident/19910629024959A), Jun 29, 1991: Cessna STC170, Lake Louise, AK, Substantial damage. Hit hump in runway on takeoff. Became airborne. Lost directional control. Ran off runway and overturned.

## Other investigations on N4659C (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 ANC01LA065](https://openairdocs.org/ntsb/ANC01LA065), Jun 4, 2001: Cessna 170B (N4659C), Sand Point, AK, substantial damage. Probable cause: The pilot's inadequate compensation for wind conditions while on approach, and the inadvertent stall of the airplane while attempting a go-around. A factor associated with the accident was a…
- [NTSB ANC90LA043](https://openairdocs.org/ntsb/ANC90LA043), Mar 17, 1990: Cessna 170B (N4659C), Sulatna Cross, AK, substantial damage. Probable cause: THE PILOT FAILED TO ADEQUATELY ASSESS THE EXISTING SNOW CONDITIONS AND SURROUNDING TERRAIN (PREFLIGHT PLANNING) PRIOR TO TAKEOFF. CONTRIBUTING FACTORS WERE: THE LIGHTING CONDITIONS, THE PILOT'S OVER…

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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