# NTSB ANC06CA108: Piper PA-18-150, N57778, Tyonek, AK, August 6, 2006

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Data collection · Final report
- Date: August 6, 2006, 14:45 local (22:45 UTC)
- Place: Tyonek, AK
- Coordinates: 61, -151.434448
- Nearby events: https://openairdocs.org/map.md?lat=61.0000&lon=-151.4344&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report December 28, 2006
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- Parties: Anchorage FSDO
- NTSB case key (mKey): 64299
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC06CA108
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/64299/pdf
- Page: https://openairdocs.org/ntsb/ANC06CA108

## Probable cause

The pilot's failure to maintain a minimum airspeed to avoid a stall, which resulted in a loss of control and a collision with terrain during takeoff initial climb.  A factor associated with the accident was an inadvertent stall.

## Sequence of events

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

- Loss of control - in flight, takeoff - initial climb
  - airspeed(vs) - not maintained, pilot in command (cause)
  - stall - inadvertent, pilot in command (contributing factor)
- In flight collision with terrain/water, descent - uncontrolled
  - terrain condition - water

## Analysis

The private pilot was departing from a remote lake in a float-equipped airplane.  The pilot said that just after takeoff, the airplane's left wing stalled, and the airplane struck the water and shoreline, sustaining substantial damage to both wings.  The pilot noted that there were no preaccident mechanical anomalies with the airplane.

## Factual narrative

The private pilot was departing from a remote lake in a float-equipped airplane.  The pilot said that just after takeoff, the airplane's left wing stalled, and the airplane struck the water and shoreline, sustaining substantial damage to both wings.  The pilot noted that there were no preaccident mechanical anomalies with the airplane.

## Aircraft

- Registration: [N57778](https://openairdocs.org/aircraft/N57778), registered now, S/N 18-7709129 (OpenAirDocs)
- Reported make and model: Piper PA-18-150
- Registry model: [Piper PA-18-150](https://openairdocs.org/model/piper-pa-18-150) (registry code 7101828) (OpenAirDocs)
- Category: Airplane
- Serial number: 18-7709129
- Airframe hours: 1220.3
- Engines: Lycoming O-320-A2B 150 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: William A. Niederer
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, May 1, 2006, 8.3 hours before
- Departed: Tyonek, AK
- Destination: LHD, Anchorage, AK

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 53; injuries: none; private; airplane ratings: single-engine land, single-engine sea; medical: class 3, without waivers/limitations; flight hours: 171 total, 60 in this make and model, 115 as pilot in command

## Weather

- Conditions: Visual (VMC), Day
- Wind: 230° at 8 knots
- Visibility: 10 statute miles
- 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 20060806022629A](https://openairdocs.org/incident/20060806022629A), Aug 6, 2006: Piper PA18150, Tyonek, AK, Substantial damage. (-23) The pilot stated to the inspector that he was departing a small pond near the mouth of the theodore river south of Tyonek for the short flight back to…

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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