# NTSB ANC86LA050: Interstate 15B2, N64AT, Port Heiden, AK, April 26, 1986

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: April 26, 1986, 18:45 local (22:45 UTC)
- Place: Port Heiden, AK
- Coordinates: 56.960056, -158.580474 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=56.9601&lon=-158.5805&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 2 minor
- Status: Completed
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 4656
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC86LA050
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/4656/pdf
- Page: https://openairdocs.org/ntsb/ANC86LA050

## Sequence of events

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

- Loss of control - on ground/water, takeoff - roll/run
  - terrain condition - loose gravel/sandy (cause)
  - aircraft handling - not maintained, pilot in command (cause)
  - terrain condition - rough/uneven (cause)
  - wind information - performed, pilot in command (cause)
  - terrain condition - sand bar (cause)
  - directional control - not maintained, pilot in command (cause)
- Nose over, takeoff - roll/run

## Analysis

THE PILOT STATED THAT DURING THE TAKEOFF ROLL HE LOST CONTROL OF THE AIRCRAFT CAUSING THE PLANE TO NOSE OVER ON ITS BACK.

## Aircraft

- Registration: [N64AT](https://openairdocs.org/deregistered/N64AT-1996-03-20), registration cancelled 1996-03-20, S/N 1015 (OpenAirDocs)
- Reported make and model: INTERSTATE 15B2
- Registry model: [Arctic S-1B2](https://openairdocs.org/model/arctic-s-1b2) (registry code 0790208) (OpenAirDocs)
- Category: Airplane
- Serial number: 1015
- Airframe hours: 725
- Engines: LYCOMING 150 150 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: John Sparage
- Airworthiness certificate: Standard, Utility
- Last inspection: Annual, August 25, 1985, 64 hours before
- Airport: Port Heiden

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; commercial; airplane ratings: single-engine sea, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: front; flight hours: 1,305 total, 525 in this make and model, 1,305 as pilot in command, 53 in the last 90 days, 20 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 270° at 20 knots, gusting 25
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 30 °F, dew point 25 °F
- Altimeter: 29.00 inHg

## 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 19860426016119A](https://openairdocs.org/incident/19860426016119A), Apr 26, 1986: Arctic S1B2, Port Heiden, AK, Substantial damage. Lost directional control during takeoff run on a beach. Crosswind and pilot technique were factors.

## Other investigations on N64AT (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 ANC93FA172](https://openairdocs.org/ntsb/ANC93FA172), Sep 8, 1993: Interstate S-1B2 Arctic Tern (N64AT), Talkeetna River, AK, destroyed. Probable cause: THE PILOT IN COMMAND'S IMPROPER PREFLIGHT PLANNING. FACTORS IN THE ACCIDENT WERE: THE ROUGH/UNEVEN TAKEOFF LOCATION, THE EXCESS WEIGHT OF THE AIRPLANE, THE INADEQUATE DESIGN OF THE ADD-ON TANK BY THE…
- [NTSB ANC83LA083](https://openairdocs.org/ntsb/ANC83LA083), May 30, 1983: Artic S-1B2 (N64AT), Palmer, 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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