# NTSB ANC82DAG37: Piper PA-18-150, N7781D, Near Tyonek, AK, June 15, 1982

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: June 15, 1982, 00:00 local (08:00 UTC)
- Place: Near Tyonek, AK
- Coordinates: 61.080562, -151.159378 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=61.0806&lon=-151.1594&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report June 15, 1983
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 71946
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC82DAG37
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/71946/pdf
- Page: https://openairdocs.org/ntsb/ANC82DAG37

## Sequence of events

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

- Nose over, landing - flare/touchdown
  - terrain condition - mountainous/hilly (contributing factor)
  - terrain condition - snow covered (contributing factor)
  - unsuitable terrain or takeoff/landing/taxi area - selected, pilot in command (cause)

## Analysis

PILOT LANDED ON A GLACIER AND NOSED OVER. AIRCRAFT OCCUPANTS WERE RESCUED AFTER BEING SIGHTED BY A COMMERCIAL CARRIER.

## Aircraft

- Registration: [N7781D](https://openairdocs.org/aircraft/N7781D), registered now, S/N 18-5970, built 1957 (OpenAirDocs)
- Reported make and model: PIPER PA-18-150
- Registry model: [Piper PA-18A 150](https://openairdocs.org/model/piper-pa-18a-150) (registry code 7101837) (OpenAirDocs)
- Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 18-5970
- Engines: LYCOMING O-320 150 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Wayne J. Cooper
- Registered owner: Wayne J. Cooper
- Departed: KUSKOKWIM RIVER, AK
- Destination: BGQ, BIG LAKE, AK

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 30; student; medical: class 3, invalid medical for flight

## Weather

- Conditions: Not reported

## 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 19820615022869A](https://openairdocs.org/incident/19820615022869A), Jun 15, 1982: Piper PA18150, Tyonek, AK, Substantial damage. Aircraft nosed over during attempted landing on glacier.

## Other investigations on N7781D (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 ANC73DAG15](https://openairdocs.org/ntsb/ANC73DAG15), Aug 26, 1972: Piper PA-18 (N7781D), Tyonek, 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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