# NTSB ANC84LA048: Cessna 170B, N4672C, Skwentna, AK, March 22, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: March 22, 1984, 18:00 local (22:00 UTC)
- Place: Skwentna, AK
- Coordinates: 61.929695, -151.729064 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=61.9297&lon=-151.7291&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 4276
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC84LA048
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/4276/pdf
- Page: https://openairdocs.org/ntsb/ANC84LA048

## Sequence of events

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

- Nose over, landing
  - unsuitable terrain or takeoff/landing/taxi area - selected, pilot in command (cause)
  - airport facilities,runway/landing area condition - snow covered (contributing factor)
  - airport facilities,runway/landing area condition - rough/uneven (contributing factor)

## Analysis

THE PLT ELECTED TO LAND ON A SNOW COVERED STRIP THAT HAD A FROZEN SNOW CRUST & WAS RUTTED. HE STATED THAT DURING THE TOUCHDOWN, THE ACFT BOUNCED, THEN HE ELECTED TO GO AROUND. HOWEVER, THE ACFT TOUCHED DOWN AGAIN & BROKE THRU THE FROZEN CRUST, THEN NOSED OVER.

## Aircraft

- Registration: [N4672C](https://openairdocs.org/aircraft/N4672C), registered now, S/N 25616, 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: 25616
- Airframe hours: 3883
- Engines: FRANKLIN O-300-A 165 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: John Parker
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, November 10, 1983, 120 hours before
- Departed: Z-15, BIRCHWOOD, AK
- Airport: Trail Ridge, runway 5, 5,000 × 30 ft, snow

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 36; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 224 total, 224 in this make and model, 169 as pilot in command, 4 in the last 90 days, 2 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 19 °F, dew point 5 °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 19840322007199A](https://openairdocs.org/incident/19840322007199A), Mar 22, 1984: Cessna 170B, Skwentna, AK, Substantial damage. Pilot attempted landing on strip that was rutted and frozen. Aircraft flipped inverted.

## Other investigations on N4672C (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 UNK64X0656](https://openairdocs.org/ntsb/UNK64X0656), Feb 22, 1964: Cessna 170B (N4672C), Juneau, 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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