# NTSB CHI86LA055: Cessna 170A, N3828V, Grygla, MN, December 31, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: December 31, 1985, 16:30 local (22:30 UTC)
- Place: Grygla, MN
- Coordinates: 48.290382, -95.610359 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=48.2904&lon=-95.6104&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 case key (mKey): 13398
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI86LA055
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/13398/pdf
- Page: https://openairdocs.org/ntsb/CHI86LA055

## Sequence of events

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

- Airframe/component/system failure/malfunction, landing - roll
  - landing gear,ski assembly - separation (contributing factor)
  - aircraft preflight - inadequate, pilot in command (contributing factor)
  - maintenance,installation - improper, pilot in command (cause)
- Loss of control - on ground/water, landing - roll
- Nose over, landing - roll
  - terrain condition - snow covered

## Analysis

THE AIRCRAFT HAD BEEN FITTED WITH OWNER INSTALLD SKIS. DURING LANDING THE LEFT SKI SEPARATES FROM ITS MOUNT ALLOWING THE LEFT SKI MOUNT TO DIG INTO THE SNOW COVERED RUNWAY. THE RIGHT WINGTIP STRUCK A SNOWBANK AND THE AIRCRAFT CAME TO REST ON ITS NOSE. THE PILOT STATED THAT THE SKI MOUNT RETAINING WASHER WAS MISSING ALLOWING THE SKI MOUNT TO SLIDE OVER THE RETAINING NUT AND COTTER PIN ON THE AXLE END.HE FURTHER STATED THAT IT WAS EITHER AN OVERSIGHT DURING PREFLIGHT, OR THAT THE WASHER COULD HAVE COME OFF DURING THE LAST LAST FLIGHT.

## Aircraft

- Registration: [N3828V](https://openairdocs.org/aircraft/N3828V), registered now, S/N 18686, built 1948 (OpenAirDocs)
- Reported make and model: CESSNA 170A
- Registry model: [Cessna 170](https://openairdocs.org/model/cessna-170) (registry code 2072302) (OpenAirDocs)
- Registry engine: [Continental C145 series](https://openairdocs.org/engine/continental-c145-series) (registry code 17012, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 18686
- Engines: CONTINENTAL C145-2 145 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Eldon J. Augustine
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, July 26, 1985
- Airport: RLA, Private

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 27; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: right; flight hours: 2,600 total

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 20 statute miles
- Lowest ceiling: none
- Temperature: 7 °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 19851231066789A](https://openairdocs.org/incident/19851231066789A), Dec 31, 1985: Cessna 170, Grygla, MN, Substantial damage. Ski mount retaining washer missing. Ski parted from mount on landing. Wingtip hit snowbank,aircraft went onto nose.

## Other investigations on N3828V (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 UNK64X3966](https://openairdocs.org/ntsb/UNK64X3966), Sep 13, 1964: Cessna 170 (N3828V), Hot Springs, SD, 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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