# NTSB ANC87LA164: Interstate S-1B2, N50AA, Beluga River, AK, September 20, 1987

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: September 20, 1987, 12:00 local (20:00 UTC)
- Place: Beluga River, AK
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report May 27, 1988
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 4926
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC87LA164
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/4926/pdf
- Page: https://openairdocs.org/ntsb/ANC87LA164

## Sequence of events

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

- On ground/water encounter with terrain/water, takeoff - roll/run
  - terrain condition - rising (contributing factor)
  - unsuitable terrain or takeoff/landing/taxi area - selected, pilot in command (cause)
  - go-around - delayed, pilot in command (cause)

## Analysis

THE PILOT LANDED ON A SMALL LAKE, DECIDED IT WAS TOO SMALL AND ATTEMPTED TO TAKE OFF. HE WAS UNABLE TO ATTAIN LIFT OFF SPEED PRIOR TO STRIKING THE OPPOSITE BANK WITH HIS FLOATS AND SUBSEQUENTLY DAMAGEING THE AIRPLANE.

## Aircraft

- Registration: [N50AA](https://openairdocs.org/aircraft/N50AA), registered now, S/N 1001, built 1974 (OpenAirDocs)
- Reported make and model: INTERSTATE S-1B2
- Registry model: [Interstate S-1B2](https://openairdocs.org/model/interstate-s-1b2) (registry code 1850303) (OpenAirDocs)
- Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 1001
- Engines: LYCOMING O-320 SERIES 150 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Norbert J. Streb
- Registered owner: Norbert J.Streb
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, November 7, 1986, 110 hours before

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 47; private; airplane ratings: single-engine sea, single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: front; flight hours: 30 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 60 statute miles
- Temperature: 52 °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 19870920054269A](https://openairdocs.org/incident/19870920054269A), Sep 20, 1987: Arctic S1B2, Beluga River, AK, Substantial damage. The float equipped aircraft struck the shore during lake operations. Pilot attempted go around after touchdown.

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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